I'm trying to apply a gradient as the background color of a View (main view of a storyboard). The code runs, but nothing changes. I'm using xCode Beta 2 and Swift.
Here's the code:
class Colors {
let colorTop = UIColor(red: 192.0/255.0, green: 38.0/255.0, blue: 42.0/255.0, alpha: 1.0)
let colorBottom = UIColor(red: 35.0/255.0, green: 2.0/255.0, blue: 2.0/255.0, alpha: 1.0)
let gl: CAGradientLayer
init() {
gl = CAGradientLayer()
gl.colors = [ colorTop, colorBottom]
gl.locations = [ 0.0, 1.0]
}
}
then in the view controller:
let colors = Colors()
func refresh() {
view.backgroundColor = UIColor.clearColor()
var backgroundLayer = colors.gl
backgroundLayer.frame = view.frame
view.layer.insertSublayer(backgroundLayer, atIndex: 0)
}
}
}
Xcode 11 • Swift 5.1
You can design your own Gradient View as follow:
#IBDesignable
public class Gradient: UIView {
#IBInspectable var startColor: UIColor = .black { didSet { updateColors() }}
#IBInspectable var endColor: UIColor = .white { didSet { updateColors() }}
#IBInspectable var startLocation: Double = 0.05 { didSet { updateLocations() }}
#IBInspectable var endLocation: Double = 0.95 { didSet { updateLocations() }}
#IBInspectable var horizontalMode: Bool = false { didSet { updatePoints() }}
#IBInspectable var diagonalMode: Bool = false { didSet { updatePoints() }}
override public class var layerClass: AnyClass { CAGradientLayer.self }
var gradientLayer: CAGradientLayer { layer as! CAGradientLayer }
func updatePoints() {
if horizontalMode {
gradientLayer.startPoint = diagonalMode ? .init(x: 1, y: 0) : .init(x: 0, y: 0.5)
gradientLayer.endPoint = diagonalMode ? .init(x: 0, y: 1) : .init(x: 1, y: 0.5)
} else {
gradientLayer.startPoint = diagonalMode ? .init(x: 0, y: 0) : .init(x: 0.5, y: 0)
gradientLayer.endPoint = diagonalMode ? .init(x: 1, y: 1) : .init(x: 0.5, y: 1)
}
}
func updateLocations() {
gradientLayer.locations = [startLocation as NSNumber, endLocation as NSNumber]
}
func updateColors() {
gradientLayer.colors = [startColor.cgColor, endColor.cgColor]
}
override public func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
updatePoints()
updateLocations()
updateColors()
}
}
The Colors you're providing to gradient must be of type CGColor. So set your array of CGColor to gl.colors.
The correct code is :
class Colors {
var gl:CAGradientLayer!
init() {
let colorTop = UIColor(red: 192.0 / 255.0, green: 38.0 / 255.0, blue: 42.0 / 255.0, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 35.0 / 255.0, green: 2.0 / 255.0, blue: 2.0 / 255.0, alpha: 1.0).cgColor
self.gl = CAGradientLayer()
self.gl.colors = [colorTop, colorBottom]
self.gl.locations = [0.0, 1.0]
}
}
Just modifying the above mentioned answer.
func setGradientBackground() {
let colorTop = UIColor(red: 255.0/255.0, green: 149.0/255.0, blue: 0.0/255.0, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 255.0/255.0, green: 94.0/255.0, blue: 58.0/255.0, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [colorTop, colorBottom]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.frame = self.view.bounds
self.view.layer.insertSublayer(gradientLayer, at:0)
}
Then call this method within viewWillAppear
override func viewWillAppear(_ animated: Bool) {
setGradientBackground()
super.viewWillAppear(animated)
}
And if you need to change the direction of the gradient you have to use startPoint and endPoint.
let gradient: CAGradientLayer = CAGradientLayer()
gradient.colors = [UIColor.blue.cgColor, UIColor.red.cgColor]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = CGPoint(x: 0.0, y: 1.0)
gradient.endPoint = CGPoint(x: 1.0, y: 1.0)
gradient.frame = CGRect(x: 0.0, y: 0.0, width: self.view.frame.size.width, height: self.view.frame.size.height)
self.view.layer.insertSublayer(gradient, at: 0)
In Swift3 try this:
func addGradient(){
let gradient:CAGradientLayer = CAGradientLayer()
gradient.frame.size = self.viewThatHoldsGradient.frame.size
gradient.colors = [UIColor.white.cgColor,UIColor.white.withAlphaComponent(0).cgColor] //Or any colors
self.viewThatHoldsGradient.layer.addSublayer(gradient)
}
I have these extensions:
#IBDesignable class GradientView: UIView {
#IBInspectable var firstColor: UIColor = UIColor.red
#IBInspectable var secondColor: UIColor = UIColor.green
#IBInspectable var vertical: Bool = true
lazy var gradientLayer: CAGradientLayer = {
let layer = CAGradientLayer()
layer.colors = [firstColor.cgColor, secondColor.cgColor]
layer.startPoint = CGPoint.zero
return layer
}()
//MARK: -
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
applyGradient()
}
override init(frame: CGRect) {
super.init(frame: frame)
applyGradient()
}
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
applyGradient()
}
override func layoutSubviews() {
super.layoutSubviews()
updateGradientFrame()
}
//MARK: -
func applyGradient() {
updateGradientDirection()
layer.sublayers = [gradientLayer]
}
func updateGradientFrame() {
gradientLayer.frame = bounds
}
func updateGradientDirection() {
gradientLayer.endPoint = vertical ? CGPoint(x: 0, y: 1) : CGPoint(x: 1, y: 0)
}
}
#IBDesignable class ThreeColorsGradientView: UIView {
#IBInspectable var firstColor: UIColor = UIColor.red
#IBInspectable var secondColor: UIColor = UIColor.green
#IBInspectable var thirdColor: UIColor = UIColor.blue
#IBInspectable var vertical: Bool = true {
didSet {
updateGradientDirection()
}
}
lazy var gradientLayer: CAGradientLayer = {
let layer = CAGradientLayer()
layer.colors = [firstColor.cgColor, secondColor.cgColor, thirdColor.cgColor]
layer.startPoint = CGPoint.zero
return layer
}()
//MARK: -
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
applyGradient()
}
override init(frame: CGRect) {
super.init(frame: frame)
applyGradient()
}
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
applyGradient()
}
override func layoutSubviews() {
super.layoutSubviews()
updateGradientFrame()
}
//MARK: -
func applyGradient() {
updateGradientDirection()
layer.sublayers = [gradientLayer]
}
func updateGradientFrame() {
gradientLayer.frame = bounds
}
func updateGradientDirection() {
gradientLayer.endPoint = vertical ? CGPoint(x: 0, y: 1) : CGPoint(x: 1, y: 0)
}
}
#IBDesignable class RadialGradientView: UIView {
#IBInspectable var outsideColor: UIColor = UIColor.red
#IBInspectable var insideColor: UIColor = UIColor.green
override func awakeFromNib() {
super.awakeFromNib()
applyGradient()
}
func applyGradient() {
let colors = [insideColor.cgColor, outsideColor.cgColor] as CFArray
let endRadius = sqrt(pow(frame.width/2, 2) + pow(frame.height/2, 2))
let center = CGPoint(x: bounds.size.width / 2, y: bounds.size.height / 2)
let gradient = CGGradient(colorsSpace: nil, colors: colors, locations: nil)
let context = UIGraphicsGetCurrentContext()
context?.drawRadialGradient(gradient!, startCenter: center, startRadius: 0.0, endCenter: center, endRadius: endRadius, options: CGGradientDrawingOptions.drawsBeforeStartLocation)
}
override func draw(_ rect: CGRect) {
super.draw(rect)
#if TARGET_INTERFACE_BUILDER
applyGradient()
#endif
}
}
Usage:
I made an UIView extension to apply a basic gradient to any view
extension UIView {
func layerGradient() {
let layer : CAGradientLayer = CAGradientLayer()
layer.frame.size = self.frame.size
layer.frame.origin = CGPointMake(0.0,0.0)
layer.cornerRadius = CGFloat(frame.width / 20)
let color0 = UIColor(red:250.0/255, green:250.0/255, blue:250.0/255, alpha:0.5).CGColor
let color1 = UIColor(red:200.0/255, green:200.0/255, blue: 200.0/255, alpha:0.1).CGColor
let color2 = UIColor(red:150.0/255, green:150.0/255, blue: 150.0/255, alpha:0.1).CGColor
let color3 = UIColor(red:100.0/255, green:100.0/255, blue: 100.0/255, alpha:0.1).CGColor
let color4 = UIColor(red:50.0/255, green:50.0/255, blue:50.0/255, alpha:0.1).CGColor
let color5 = UIColor(red:0.0/255, green:0.0/255, blue:0.0/255, alpha:0.1).CGColor
let color6 = UIColor(red:150.0/255, green:150.0/255, blue:150.0/255, alpha:0.1).CGColor
layer.colors = [color0,color1,color2,color3,color4,color5,color6]
self.layer.insertSublayer(layer, atIndex: 0)
}
}
Try This , It's working for me,
var gradientView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 35))
let gradientLayer:CAGradientLayer = CAGradientLayer()
gradientLayer.frame.size = self.gradientView.frame.size
gradientLayer.colors =
[UIColor.white.cgColor,UIColor.red.withAlphaComponent(1).cgColor]
//Use diffrent colors
gradientView.layer.addSublayer(gradientLayer)
You can add starting and end point of gradient color.
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.0)
For more detail description refer Best Answer or you can follow CAGradientLayer From Apple
Hopes This is help for some one.
It's easy
// MARK: - Gradient
extension CAGradientLayer {
enum Point {
case topLeft
case centerLeft
case bottomLeft
case topCenter
case center
case bottomCenter
case topRight
case centerRight
case bottomRight
var point: CGPoint {
switch self {
case .topLeft:
return CGPoint(x: 0, y: 0)
case .centerLeft:
return CGPoint(x: 0, y: 0.5)
case .bottomLeft:
return CGPoint(x: 0, y: 1.0)
case .topCenter:
return CGPoint(x: 0.5, y: 0)
case .center:
return CGPoint(x: 0.5, y: 0.5)
case .bottomCenter:
return CGPoint(x: 0.5, y: 1.0)
case .topRight:
return CGPoint(x: 1.0, y: 0.0)
case .centerRight:
return CGPoint(x: 1.0, y: 0.5)
case .bottomRight:
return CGPoint(x: 1.0, y: 1.0)
}
}
}
convenience init(start: Point, end: Point, colors: [CGColor], type: CAGradientLayerType) {
self.init()
self.startPoint = start.point
self.endPoint = end.point
self.colors = colors
self.locations = (0..<colors.count).map(NSNumber.init)
self.type = type
}
}
Use like this:-
let fistColor = UIColor.white
let lastColor = UIColor.black
let gradient = CAGradientLayer(start: .topLeft, end: .topRight, colors: [fistColor.cgColor, lastColor.cgColor], type: .radial)
gradient.frame = yourView.bounds
yourView.layer.addSublayer(gradient)
Extend UIView with this custom class.
GradientView.swift
import UIKit
class GradientView: UIView {
// Default Colors
var colors:[UIColor] = [UIColor.redColor(), UIColor.blueColor()]
override func drawRect(rect: CGRect) {
// Must be set when the rect is drawn
setGradient(colors[0], color2: colors[1])
}
func setGradient(color1: UIColor, color2: UIColor) {
let context = UIGraphicsGetCurrentContext()
let gradient = CGGradientCreateWithColors(CGColorSpaceCreateDeviceRGB(), [color1.CGColor, color2.CGColor], [0, 1])!
// Draw Path
let path = UIBezierPath(rect: CGRectMake(0, 0, frame.width, frame.height))
CGContextSaveGState(context)
path.addClip()
CGContextDrawLinearGradient(context, gradient, CGPointMake(frame.width / 2, 0), CGPointMake(frame.width / 2, frame.height), CGGradientDrawingOptions())
CGContextRestoreGState(context)
}
override func layoutSubviews() {
// Ensure view has a transparent background color (not required)
backgroundColor = UIColor.clearColor()
}
}
Usage
gradientView.colors = [UIColor.blackColor().colorWithAlphaComponent(0.8), UIColor.clearColor()]
Result
Swift 4
Add a view outlet
#IBOutlet weak var gradientView: UIView!
Add gradient to the view
func setGradient() {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = CGPoint(x: 0.0, y: 1.0)
gradient.endPoint = CGPoint(x: 1.0, y: 1.0)
gradient.frame = gradientView.layer.frame
gradientView.layer.insertSublayer(gradient, at: 0)
}
This code will work with Swift 3.0
class GradientView: UIView {
override open class var layerClass: AnyClass {
get{
return CAGradientLayer.classForCoder()
}
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let gradientLayer = self.layer as! CAGradientLayer
let color1 = UIColor.white.withAlphaComponent(0.1).cgColor as CGColor
let color2 = UIColor.white.withAlphaComponent(0.9).cgColor as CGColor
gradientLayer.locations = [0.60, 1.0]
gradientLayer.colors = [color2, color1]
}
}
I mixed the Rohit Sisodia and MGM answers
// MARK: - Gradient
public enum CAGradientPoint {
case topLeft
case centerLeft
case bottomLeft
case topCenter
case center
case bottomCenter
case topRight
case centerRight
case bottomRight
var point: CGPoint {
switch self {
case .topLeft:
return CGPoint(x: 0, y: 0)
case .centerLeft:
return CGPoint(x: 0, y: 0.5)
case .bottomLeft:
return CGPoint(x: 0, y: 1.0)
case .topCenter:
return CGPoint(x: 0.5, y: 0)
case .center:
return CGPoint(x: 0.5, y: 0.5)
case .bottomCenter:
return CGPoint(x: 0.5, y: 1.0)
case .topRight:
return CGPoint(x: 1.0, y: 0.0)
case .centerRight:
return CGPoint(x: 1.0, y: 0.5)
case .bottomRight:
return CGPoint(x: 1.0, y: 1.0)
}
}
}
extension CAGradientLayer {
convenience init(start: CAGradientPoint, end: CAGradientPoint, colors: [CGColor], type: CAGradientLayerType) {
self.init()
self.frame.origin = CGPoint.zero
self.startPoint = start.point
self.endPoint = end.point
self.colors = colors
self.locations = (0..<colors.count).map(NSNumber.init)
self.type = type
}
}
extension UIView {
func layerGradient(startPoint:CAGradientPoint, endPoint:CAGradientPoint ,colorArray:[CGColor], type:CAGradientLayerType ) {
let gradient = CAGradientLayer(start: .topLeft, end: .topRight, colors: colorArray, type: type)
gradient.frame.size = self.frame.size
self.layer.insertSublayer(gradient, at: 0)
}
}
To Use write:-
btnUrdu.layer.cornerRadius = 25
btnUrdu.layer.masksToBounds = true
btnUrdu.layerGradient(startPoint: .centerRight, endPoint: .centerLeft, colorArray: [UIColor.appBlue.cgColor, UIColor.appLightBlue.cgColor], type: .axial)
Output:
if you want to use HEX instead of RGBA, just drag a new empty .swift and add below mentioned code:
import UIKit
extension UIColor {
convenience init(rgba: String) {
var red: CGFloat = 0.0
var green: CGFloat = 0.0
var blue: CGFloat = 0.0
var alpha: CGFloat = 1.0
if rgba.hasPrefix("#") {
let index = advance(rgba.startIndex, 1)
let hex = rgba.substringFromIndex(index)
let scanner = NSScanner(string: hex)
var hexValue: CUnsignedLongLong = 0
if scanner.scanHexLongLong(&hexValue) {
switch (count(hex)) {
case 3:
red = CGFloat((hexValue & 0xF00) >> 8) / 15.0
green = CGFloat((hexValue & 0x0F0) >> 4) / 15.0
blue = CGFloat(hexValue & 0x00F) / 15.0
case 4:
red = CGFloat((hexValue & 0xF000) >> 12) / 15.0
green = CGFloat((hexValue & 0x0F00) >> 8) / 15.0
blue = CGFloat((hexValue & 0x00F0) >> 4) / 15.0
alpha = CGFloat(hexValue & 0x000F) / 15.0
case 6:
red = CGFloat((hexValue & 0xFF0000) >> 16) / 255.0
green = CGFloat((hexValue & 0x00FF00) >> 8) / 255.0
blue = CGFloat(hexValue & 0x0000FF) / 255.0
case 8:
red = CGFloat((hexValue & 0xFF000000) >> 24) / 255.0
green = CGFloat((hexValue & 0x00FF0000) >> 16) / 255.0
blue = CGFloat((hexValue & 0x0000FF00) >> 8) / 255.0
alpha = CGFloat(hexValue & 0x000000FF) / 255.0
default:
print("Invalid RGB string, number of characters after '#' should be either 3, 4, 6 or 8")
}
} else {
println("Scan hex error")
}
} else {
print("Invalid RGB string, missing '#' as prefix")
}
self.init(red:red, green:green, blue:blue, alpha:alpha)
}
}
similarly, drag another empty .swift file and add below mentioned code:
class Colors {
let colorTop = UIColor(rgba: "##8968CD").CGColor
let colorBottom = UIColor(rgba: "#5D478B").CGColor
let gl: CAGradientLayer
init() {
gl = CAGradientLayer()
gl.colors = [ colorTop, colorBottom]
gl.locations = [ 0.0, 1.0]
}
}
after that in view controller, under class instantiate your 'Color' class like this:
let colors = Colors()
add a new function:
func refresh() {
view.backgroundColor = UIColor.clearColor()
var backgroundLayer = colors.gl
backgroundLayer.frame = view.frame
view.layer.insertSublayer(backgroundLayer, atIndex: 0)
}
state that function in viewDidLoad:
refresh()
you're done :))
using HEX is way too easy if compared to RGBA. :D
Swift 3 - Uses only textures and SKSpriteNode, doesn't require UIView
import Foundation
import SpriteKit
class GradientSpriteNode : SKSpriteNode
{
convenience init(size: CGSize, colors: [UIColor], locations: [CGFloat])
{
let texture = GradientSpriteNode.texture(size: size, colors: colors, locations: locations)
self.init(texture: texture, color:SKColor.clear, size: texture.size())
}
private override init(texture: SKTexture!, color: SKColor, size: CGSize) {
super.init(texture: texture, color: color, size: size)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private static func texture(size: CGSize, colors: [UIColor], locations: [CGFloat]) -> SKTexture
{
UIGraphicsBeginImageContext(size)
let context = UIGraphicsGetCurrentContext()!
let gradient = CGGradient(colorsSpace: CGColorSpaceCreateDeviceRGB(), colors: colors.map{$0.cgColor} as CFArray, locations: locations)!
context.drawLinearGradient(gradient, start: CGPoint(x: size.width / 2, y: 0), end: CGPoint(x: size.width / 2, y: size.height), options: CGGradientDrawingOptions())
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return SKTexture(image: image!)
}
}
Usage:
let gradient = GradientSpriteNode(
size: CGSize(width: 100, height: 100),
colors: [UIColor.red, UIColor.blue],
locations: [0.0, 1.0])
addChild(gradient)
I wanted to add a gradient to a view, and then anchor it using auto-layout.
class GradientView: UIView {
private let gradient: CAGradientLayer = {
let layer = CAGradientLayer()
let topColor: UIColor = UIColor(red:0.98, green:0.96, blue:0.93, alpha:0.5)
let bottomColor: UIColor = UIColor.white
layer.colors = [topColor.cgColor, bottomColor.cgColor]
layer.locations = [0,1]
return layer
}()
init() {
super.init(frame: .zero)
gradient.frame = frame
layer.insertSublayer(gradient, at: 0)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
gradient.frame = bounds
}
}
Xcode 11 | Swift 5
If anybody is looking for a quick and easy way to add a gradient to a view:
extension UIView {
func addGradient(colors: [UIColor] = [.blue, .white], locations: [NSNumber] = [0, 2], startPoint: CGPoint = CGPoint(x: 0.0, y: 1.0), endPoint: CGPoint = CGPoint(x: 1.0, y: 1.0), type: CAGradientLayerType = .axial){
let gradient = CAGradientLayer()
gradient.frame.size = self.frame.size
gradient.frame.origin = CGPoint(x: 0.0, y: 0.0)
// Iterates through the colors array and casts the individual elements to cgColor
// Alternatively, one could use a CGColor Array in the first place or do this cast in a for-loop
gradient.colors = colors.map{ $0.cgColor }
gradient.locations = locations
gradient.startPoint = startPoint
gradient.endPoint = endPoint
// Insert the new layer at the bottom-most position
// This way we won't cover any other elements
self.layer.insertSublayer(gradient, at: 0)
}
}
Examples on how to use the extension:
// Testing
view.addGradient()
// Two Colors
view.addGradient(colors: [.init(rgb: 0x75BBDB), .black], locations: [0, 3])
// Full Blown
view.addGradient(colors: [.init(rgb: 0x75BBDB), .black], locations: [0, 3], startPoint: CGPoint(x: 0.0, y: 1.5), endPoint: CGPoint(x: 1.0, y: 2.0), type: .axial)
Optionally, use the following to input hex numbers .init(rgb: 0x75BBDB)
extension UIColor {
convenience init(red: Int, green: Int, blue: Int) {
self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: 1.0)
}
convenience init(rgb: Int) {
self.init(
red: (rgb >> 16) & 0xFF,
green: (rgb >> 8) & 0xFF,
blue: rgb & 0xFF
)
}
}
Use below code :
extension UIView {
func applyGradient(colours: [UIColor]) -> Void {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.startPoint = CGPoint(x : 0.0, y : 0.5)
gradient.endPoint = CGPoint(x :1.0, y: 0.5)
self.layer.insertSublayer(gradient, at: 0)
}
}
call this function like :
self.mainView.applyGradient(colours: [.green, .blue])
To add gradient into layer, add:
let layer = CAGradientLayer()
layer.frame = CGRect(x: 64, y: 64, width: 120, height: 120)
layer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
view.layer.addSublayer(layer)
Just Specify the Frame of the View, where you want to show the gradient color.
let firstColor = UIColor(red: 69/255, green: 90/255, blue: 195/255, alpha: 1.0).CGColor
let secondColor = UIColor(red: 230/255, green: 44/255, blue: 75/255, alpha: 1.0).CGColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [ firstColor, secondColor]
gradientLayer.locations = [ 0.0, 1.0]
gradientLayer.frame = CGRectMake(0, 0, 375, 64)// You can mention frame here
self.view.layer.addSublayer(gradientLayer)
Here's a variation for setting this up in a reusable Util class file
In your Xcode project:
Create a new Swift class call it UI_Util.swift, and populate it as follows:
import Foundation
import UIKit
class UI_Util {
static func setGradientGreenBlue(uiView: UIView) {
let colorTop = UIColor(red: 15.0/255.0, green: 118.0/255.0, blue: 128.0/255.0, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 84.0/255.0, green: 187.0/255.0, blue: 187.0/255.0, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [ colorTop, colorBottom]
gradientLayer.locations = [ 0.0, 1.0]
gradientLayer.frame = uiView.bounds
uiView.layer.insertSublayer(gradientLayer, at: 0)
}
}
Now you can call the function from any ViewController like so:
class AbcViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
UI_Util.setGradientGreen(uiView: self.view)
}
Thanks to katwal-Dipak's answer for the function code
For swift to apply CAGradientLayer to any object (Horizontal and vertical)
func makeGradientColor(`for` object : AnyObject , startPoint : CGPoint , endPoint : CGPoint) -> CAGradientLayer {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.colors = [(UIColor(red: 59.0/255.0, green: 187.0/255.0, blue: 182.0/255.0, alpha: 1.00).cgColor), (UIColor(red: 57.0/255.0, green: 174.0/255.0, blue: 236.0/255.0, alpha: 1.00).cgColor)]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = startPoint
gradient.endPoint = endPoint
gradient.frame = CGRect(x: 0.0, y: 0.0, width: object.frame.size.width, height: object.frame.size.height)
return gradient
}
How to use
let start : CGPoint = CGPoint(x: 0.0, y: 1.0)
let end : CGPoint = CGPoint(x: 1.0, y: 1.0)
let gradient: CAGradientLayer = self.makeGradientColor(for: vwTop, startPoint: start, endPoint: end)
vwTop.layer.insertSublayer(gradient, at: 0)
let start1 : CGPoint = CGPoint(x: 1.0, y: 1.0)
let end1 : CGPoint = CGPoint(x: 1.0, y: 0.0)
let gradient1: CAGradientLayer = self.makeGradientColor(for: vwTop, startPoint: start1, endPoint: end1)
vwBottom.layer.insertSublayer(gradient1, at: 0)
You can check output here
There is a library called Chameleon (https://github.com/viccalexander/Chameleon) which one can use for gradient colors. It even has styles of gradient to implement. This is how you can add it in swift 4 podfile
pod 'ChameleonFramework/Swift', :git => 'https://github.com/ViccAlexander/Chameleon.git', :branch => 'wip/swift4'
import ChameleonFramework
let colors:[UIColor] = [
UIColor.flatPurpleColorDark(),
UIColor.flatWhiteColor()
]
view.backgroundColor = GradientColor(.TopToBottom, frame: view.frame, colors: colors)
Here's a swift extension where you can pass any amount of arbitrary colors. It will remove any previous gradients before inserting one and it will return the newly inserted gradient layer for further manipulation if needed:
extension UIView {
/**
Given an Array of CGColor, it will:
- Remove all sublayers of type CAGradientLayer.
- Create and insert a new CAGradientLayer.
- Parameters:
- colors: An Array of CGColor with the colors for the gradient fill
- Returns: The newly created gradient CAGradientLayer
*/
func layerGradient(colors c:[CGColor])->CAGradientLayer {
self.layer.sublayers = self.layer.sublayers?.filter(){!($0 is CAGradientLayer)}
let layer : CAGradientLayer = CAGradientLayer()
layer.frame.size = self.frame.size
layer.frame.origin = CGPointZero
layer.colors = c
self.layer.insertSublayer(layer, atIndex: 0)
return layer
}
}
Cleaner code that lets you pass any UIColor to an instance of the GradientLayer class:
class GradientLayer {
let gradientLayer: CAGradientLayer
let colorTop: CGColor
let colorBottom: CGColor
init(colorTop: UIColor, colorBottom: UIColor) {
self.colorTop = colorTop.CGColor
self.colorBottom = colorBottom.CGColor
gradientLayer = CAGradientLayer()
gradientLayer.colors = [colorTop, colorBottom]
gradientLayer.locations = [0.0, 1.0]
}
}
Easy to use extension on swift 3
extension CALayer {
func addGradienBorder(colors:[UIColor] = [UIColor.red,UIColor.blue], width:CGFloat = 1) {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = CGRect(origin: .zero, size: self.bounds.size)
gradientLayer.startPoint = CGPoint(x:0.0, y:0.5)
gradientLayer.endPoint = CGPoint(x:1.0, y:0.5)
gradientLayer.colors = colors.map({$0.cgColor})
let shapeLayer = CAShapeLayer()
shapeLayer.lineWidth = width
shapeLayer.path = UIBezierPath(rect: self.bounds).cgPath
shapeLayer.fillColor = nil
shapeLayer.strokeColor = UIColor.black.cgColor
gradientLayer.mask = shapeLayer
self.addSublayer(gradientLayer)
}
}
use to your view, example
yourView.addGradienBorder(color: UIColor.black, opacity: 0.1, offset: CGSize(width:2 , height: 5), radius: 3, viewCornerRadius: 3.0)
If you have view Collection (Multiple View) do this
func setGradientBackground() {
let v:UIView
for v in viewgradian
//here viewgradian is your view Collection Outlet name
{
let layer:CALayer
var arr = [AnyObject]()
for layer in v.layer.sublayers!
{
arr.append(layer)
}
let colorTop = UIColor(red: 216.0/255.0, green: 240.0/255.0, blue: 244.0/255.0, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [ colorBottom, colorTop]
gradientLayer.startPoint = CGPoint(x: 1.0, y: 0.0)
gradientLayer.endPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.frame = v.bounds
v.layer.insertSublayer(gradientLayer, at: 0)
}
}
For those wanting an Objective C version of the answer. Tested and works on iOS13
// Done here so that constraints have completed and the frame is correct.
- (void) viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
UIColor *colorTop = [UIColor colorWithRed:(CGFloat)192.0/255.0 green: 38.0/255.0 blue: 42.0/255.0 alpha:1.0];
UIColor *colorBottom = [UIColor colorWithRed: 35.0/255.0 green: 2.0/255.0 blue: 2.0/255.0 alpha: 1.0];
CAGradientLayer *gl = [CAGradientLayer new];
[gl setColors:#[(id)[colorTop CGColor], (id)[colorBottom CGColor]]];
[gl setLocations:#[#0.0f, #1.0f]];
self.view.backgroundColor = [UIColor clearColor];
CALayer *backgroundLayer = gl;
backgroundLayer.frame = self.view.frame;
[self.view.layer insertSublayer:backgroundLayer atIndex:0];
}
One thing I noticed is you can't add a gradient to a UILabel without clearing the text. One simple workaround is to use a UIButton and disable user interaction.
SwiftUI: You can use the LinearGradient struct as the first element in a ZStack. As the "bottom" of the ZStack, it will serve as the background color. AngularGradient and RadialGradient are also available.
import SwiftUI
struct ContentView: View {
var body: some View {
ZStack {
LinearGradient(gradient: Gradient(colors: [.red, .blue]), startPoint: .top, endPoint: .bottom)
.edgesIgnoringSafeArea(.all)
// Put other content here; it will appear on top of the background gradient
}
}
}
Related
When a user clicks on a button, it randomizes the colors used to create a gradient in a large circle. Beneath it are two small circles that display the solid colors used for the gradient. They all display correctly at the start (main circle is a gradient of the randomized smaller circles' color) but when I click on the button, only the smaller circles change color; the large circle stays at the same gradient colors.
Extensions and View Controller:
extension UIView {
func setupGradientBackground(colorOne: UIColor, colorTwo: UIColor) {
let gradientLayer: CAGradientLayer = CAGradientLayer()
gradientLayer.colors = [colorOne.cgColor, colorTwo.cgColor]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
gradientLayer.frame = self.bounds
self.layer.insertSublayer(gradientLayer, at: 0)
}
}
extension UIColor {
static var random: UIColor {
return UIColor(red: .random(in: 0...1), green: .random(in: 0...1), blue: .random(in: 0...1), alpha: 1.0)
}
}
class GradientController: UIViewController {
let gradientView = GradientView()
let leftGradientColor: UIColor = .random
let rightGradientColor: UIColor = .random
}
override func viewDidLoad() {
super.viewDidLoad()
view = gradientView
newGradient()
}
func newGradient() {
gradientView.mainCircleView.setupGradientBackground(colorOne: leftGradientColor, colorTwo: rightGradientColor)
gradientView.colorCircleLeftView.backgroundColor = leftGradientColor
gradientView.colorCircleRightView.backgroundColor = rightGradientColor
gradientView.gradientGenerateButton.addTarget(self, action: #selector(randomGradient(sender:)), for: .touchUpInside)
}
#objc func randomGradient(sender: UIButton)
{
let leftGradient = UIColor.random
let rightGradient = UIColor.random
gradientView.colorCircleLeftView.backgroundColor = leftGradient
gradientView.colorCircleRightView.backgroundColor = rightGradient
//Here is where it's not changing colors. Doesn't seem like the VC recognizes it in this function
gradientView.mainCircleView.setupGradientBackground(colorOne: leftGradient, colorTwo: rightGradient)
}
View:
class GradientView: UIView {
//circle's UIView code in Extensions
let mainCircleView = UIView().circleView(width: 380, height: 380)
let colorCircleLeftView = UIView().circleView(width: 40, height: 40)
let colorCircleRightView = UIView().circleView(width: 40, height: 40)
...
func setupLayout() {
...
}
}
What I've tried is changing the mainCircleView color to solid UIColors, like gradientView.mainCircleView.setupGradientBackground(colorOne: .red, colorTwo: .orange) to see if the main Circle changes to those colors in both func newGradient() and #objc func randomGradient(sender: UIButton). It only changes in func newGradient() what I've set manually, so that means the VC isn't recognizing the main Circle in the #objc func but I'm lost on how to fix it...
Any help is appreciated!
What it looks like when I click the "Generate" button (large circle should be showing brown and purple):
Update your function with this, You have to remove old layer and then insert new Sublayer.
Solution 1 :
func setupGradientBackground(colorOne: UIColor, colorTwo: UIColor) {
if let gradientLayer = (self.layer.sublayers?.compactMap { $0 as? CAGradientLayer })?.first {
gradientLayer.removeFromSuperlayer()
}
let gradientLayer: CAGradientLayer = CAGradientLayer()
gradientLayer.colors = [colorOne.cgColor, colorTwo.cgColor]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
gradientLayer.frame = self.bounds
self.layer.insertSublayer(gradientLayer, at: 0)
}
Solution 2 :
func setupGradientBackground(colorOne: UIColor, colorTwo: UIColor) {
let gradientLayer = layer.sublayers?.first as? CAGradientLayer ?? CAGradientLayer()
gradientLayer.colors = [colorOne.cgColor, colorTwo.cgColor]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
gradientLayer.frame = self.bounds
guard gradientLayer.superlayer != self else {
return
}
layer.insertSublayer(gradientLayer, at: 0)
}
Solution 3 :
you can set name to your CAGradientLayer, This will help you for removing that particular layer.
func setupGradientBackground(colorOne: UIColor, colorTwo: UIColor) {
for layer in layer.sublayers ?? [] {
if layer.name == "GradientLayer" {
layer.removeFromSuperlayer()
}
}
let gradientLayer: CAGradientLayer = CAGradientLayer()
gradientLayer.colors = [colorOne.cgColor, colorTwo.cgColor]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
gradientLayer.name = "GradientLayer"
gradientLayer.frame = self.bounds
self.layer.insertSublayer(gradientLayer, at: 0)
}
The gradient does not change because you add a new gradient below the existing one
extension UIView {
func setupGradientBackground(colorOne: UIColor, colorTwo: UIColor) {
let gradientLayer: CAGradientLayer = CAGradientLayer()
...
// ⬇ There is a mistake.
self.layer.insertSublayer(gradientLayer, at: 0)
}
}
You should change the current gradient with this new one. Or insert a new one above the old one.
Changing the gradient layer colors after setting it
extension CALayer {
func updateGradientColors(_ colors:CGColor...) {
if let layer = sublayers?.first as? CAGradientLayer {
let frame = CGRect(origin: self.bounds.origin, size: CGSize(width: self.bounds.size.width, height: self.bounds.size.height))
layer.frame = frame
layer.colors = colors
}
}
}
I can remove the gradient from the subview fine, But If a button is added to the subview I can not remove the gradient layer. How can I Remove gradient from subview on rotation.
Here is the code for the View Controller.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var buttonOutlet: UIButton!
#IBOutlet weak var labelOutlet: UILabel!
#IBOutlet weak var mySubView: UIView!
#IBOutlet weak var mySubView2: UIView!
#IBOutlet weak var mySubView3: UIView!
override func viewDidLayoutSubviews() {
addGradient()
}
fileprivate func addGradient() {
mySubView.mainGradientBackground()
mySubView2.subGradientBackground()
mySubView3.subGradientBackground()
labelOutlet.labelTextfieldShadow()
buttonOutlet.buttonGradientBackground(cornerRadius: 10, shadowRadius: 3)
}
/// This will let you know when the device rotates.
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
if UIDevice.current.orientation.isValidInterfaceOrientation {
removeSublayer(mySubView, layerIndex: 0)
removeSublayer(mySubView, layerIndex: 0)
removeSublayer(mySubView2, layerIndex: 0)
removeSublayer(mySubView2, layerIndex: 0)
removeSublayer(mySubView3, layerIndex: 0)
removeSublayer(mySubView3, layerIndex: 0)
removeSublayer(buttonOutlet, layerIndex: 0)
removeSublayer(buttonOutlet, layerIndex: 0)
removeSublayer(labelOutlet, layerIndex: 0)
}
}
func removeSublayer(_ view: UIView, layerIndex index: Int) {
guard let sublayers = view.layer.sublayers else {
print("The view does not have any sublayers.")
return
}
if sublayers.count > index {
view.layer.sublayers!.remove(at: index)
} else {
print("There are not enough sublayers to remove that index.")
}
}
}
This is the Gradient Extension used to color any views I need.
import Foundation
import UIKit
extension UIView {
/// Use this to set a gradient for the background.
/// = This is a gradient with no shadow.
func mainGradientBackground() {
let color = Color()
let leading = color.backgroundLeading
let trailing = color.backgroundTrailing
let gradientLayer = CAGradientLayer()
gradientLayer.frame = bounds
gradientLayer.colors = [leading, trailing]
gradientLayer.locations = [0,0.3]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
layer.insertSublayer(gradientLayer, at: 0)
}
/// Use this to set a gradient for the background.
/// = This is a gradient with a shadow.
func subGradientBackground() {
let corner: CGFloat = 15
let color = Color()
let leading = color.subBackgroundLeading
let trailing = color.subBackgroundTrailing
let borderColor = color.subBorderColor
let gradientLayer = CAGradientLayer()
gradientLayer.frame = bounds
gradientLayer.colors = [leading, trailing]
gradientLayer.locations = [0,0.3,1]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.borderColor = borderColor
gradientLayer.borderWidth = 4
gradientLayer.cornerRadius = corner
layer.insertSublayer(gradientLayer, at: 0)
let subLayer = CALayer()
subLayer.frame = bounds
subLayer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: corner - 2).cgPath
subLayer.shadowColor = UIColor.red.cgColor
subLayer.shadowOpacity = 1
subLayer.shadowRadius = 2
subLayer.shadowOffset = CGSize(width: 3, height: 4)
layer.insertSublayer(subLayer, at: 0)
}
/// Use this to set a gradient for the background.
/// = This is a gradient with a shadow.
func subGradientBackgroundShadow() {
let corner: CGFloat = 15
let subLayer = CALayer()
subLayer.frame = bounds
subLayer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: corner - 2).cgPath
subLayer.shadowColor = UIColor.red.cgColor
subLayer.shadowOpacity = 1
subLayer.shadowRadius = 2
subLayer.shadowOffset = CGSize(width: 3, height: 4)
layer.insertSublayer(subLayer, at: 0)
}
/// LabelShadow
/// - Parameter masksToBounds: Keep the layer in its bound
/// - Exp.. Set to true to keep text in textview in its frame.
/// - Exp.. Set to false to let shadow out side the frame.
/// - Defalr corner radius is 7
func labelTextfieldShadow() {
let color = Color()
let dark = color.labelBackgroundDark
let borderColor = color.labelBorderColor
layer.masksToBounds = false
layer.borderWidth = 0.5
layer.borderColor = borderColor
layer.cornerRadius = 7
self.backgroundColor = dark
layer.shadowRadius = 7
layer.shadowColor = UIColor.black.cgColor
layer.shadowOffset = CGSize(width: 3, height: 3)
layer.shadowOpacity = 0.6
}
/// Button gradient
/// - Parameter cornerRadius: Set the radius of the button. Use outlet height / 2
/// - Parameter shadowRadius: Set the shadow radius. 2
func buttonGradientBackground(cornerRadius: CGFloat, shadowRadius: CGFloat) {
let color = Color()
let leading = color.buttonLeading
let middle = color.buttonMiddle
let trailing = color.buttonTrailing
let borderColor = color.buttonBorderColor
let gradientLayer = CAGradientLayer()
gradientLayer.frame = bounds
gradientLayer.colors = [leading, middle, trailing]
gradientLayer.locations = [0,0.3,1]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.borderColor = borderColor
gradientLayer.borderWidth = 1
gradientLayer.cornerRadius = cornerRadius
layer.insertSublayer(gradientLayer, at: 0)
let subLayer = CALayer()
subLayer.frame = bounds
subLayer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius - 2).cgPath
subLayer.shadowColor = UIColor.black.cgColor
subLayer.shadowOpacity = 1
subLayer.shadowRadius = shadowRadius
subLayer.shadowOffset = CGSize(width: 2, height: 3)
layer.insertSublayer(subLayer, at: 0)
}
}
Here is four screen shots of the screen.
This is a color struct to color all of the views.. Main view, Sub view, Labels and Buttons.
struct Color {
// Use these colors to style the main background.
/// This color is used for the main view's background leading greadient color.
let backgroundLeading = #colorLiteral(red: 0.2745098039, green: 0.231372549, blue: 0.231372549, alpha: 1).cgColor
/// TThis color is used for the main view's background trailing greadient color.
let backgroundTrailing = #colorLiteral(red: 0.2784313725, green: 0.2352941176, blue: 0.2352941176, alpha: 1).cgColor
// Use these colors to style the sub view.
/// This color is used for the sub view's leading greadient color.
let subBackgroundLeading = #colorLiteral(red: 0.1960784314, green: 0.2549019608, blue: 0.2549019608, alpha: 1).cgColor
/// This color is used for the sub view's trailing greadient color.
let subBackgroundTrailing = #colorLiteral(red: 0.1012082246, green: 0.2111029723, blue: 0.1947238818, alpha: 1).cgColor
/// This color is used for the sub view's border.
let subBorderColor = #colorLiteral(red: 0.6000000238, green: 0.6000000238, blue: 0.6000000238, alpha: 1).cgColor
// Use these colors to style the labels.
/// This color is used for editing text background.
let labelBackgroundLight = #colorLiteral(red: 0.921431005, green: 0.9214526415, blue: 0.9214410186, alpha: 1) as UIColor
/// This color is used for disabled text background.
let labelBackgroundDark = #colorLiteral(red: 0.1843137255, green: 0.137254902, blue: 0.1384684741, alpha: 1) as UIColor
/// This color is used for the label's border.
let labelBorderColor = #colorLiteral(red: 0.6, green: 0.6, blue: 0.6, alpha: 1).cgColor
// Use these colors to style the buttons.
/// This color is used for the button's leading greadient color.
let buttonLeading = #colorLiteral(red: 0.1960784314, green: 0.2549019608, blue: 0.2549019608, alpha: 1).cgColor
/// This color is used for the button's middle greadient color.
let buttonMiddle = #colorLiteral(red: 0.2, green: 0.2, blue: 0.2, alpha: 1).cgColor
/// This color is used for the button's trailing greadient color.
let buttonTrailing = #colorLiteral(red: 0.1012082246, green: 0.2111029723, blue: 0.1947238818, alpha: 1).cgColor
/// This color is used for the button's border color.
let buttonBorderColor = #colorLiteral(red: 0.6000000238, green: 0.6000000238, blue: 0.6000000238, alpha: 1).cgColor
// Use these colors for the text
/// This color is used for the deiabled label and text field.
let labelDisableColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
/// This color is used for the enabled label and text field.
let labelEnableColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
/// The text color white.
let labelWhiteTextColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
/// The text color Black
let labelBlackTextColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
}
Instead of assuming that a layer is at a given index, just retain the laters you want to remove as an instance variable (or in an array of CALayers) and then tell the layer(s) to remove themselves from their super layer.
For example:
var layersToRemoveLater = [CALayer]()
...
layersToRemoveLater.append(someLayer)
layersToRemoveLater.append(someOtherLayer)
...
layersToRemoveLater.forEach { $0.removeFromSuperLayer() }
The way to do this was to change each one of the extension to a class. With extension you have to take care of all of the layout your self. By using these as a class you can set each Button, Sub view Ect... in the storyboard, this way the view itself will redrawing the layout.
/// Use this to set a greadient for the background.
/// = This is a greadient with no shadow.
class MainGradientView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupView()
}
private func setupView() {
autoresizingMask = [.flexibleWidth, .flexibleHeight]
guard let gradientLayer = self.layer as? CAGradientLayer else {
return;
}
let color = Color()
let leading = color.backgroundLeading
let trailing = color.backgroundTrailing
gradientLayer.frame = bounds
gradientLayer.colors = [leading, trailing]
gradientLayer.locations = [0,0.3]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
}
override class var layerClass: AnyClass {
return CAGradientLayer.self
}
}
/// Use this to set a greadient for the background.
/// = This is a greadient with a shadow.
class SubGradientView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupView()
}
private func setupView() {
autoresizingMask = [.flexibleWidth, .flexibleHeight]
guard let gradientLayer = self.layer as? CAGradientLayer else {
return;
}
let corner: CGFloat = 15
let color = Color()
let leading = color.subBackgroundLeading
let trailing = color.subBackgroundTrailing
let borderColor = color.subBorderColor
gradientLayer.frame = self.bounds
gradientLayer.colors = [leading, trailing]
gradientLayer.locations = [0,0.3,1]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.borderColor = borderColor
gradientLayer.borderWidth = 0.4
gradientLayer.cornerRadius = corner
self.layer.shadowColor = UIColor.black.cgColor
self.layer.shadowOpacity = 1
self.layer.shadowRadius = 2
self.layer.shadowOffset = CGSize(width: 3, height: 4)
}
override class var layerClass: AnyClass {
return CAGradientLayer.self
}
}
/// Use this to set a greadient for the background.
/// = This is a greadient with no shadow.
class TabBarGradientView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupView()
}
private func setupView() {
autoresizingMask = [.flexibleWidth, .flexibleHeight]
guard let gradientLayer = self.layer as? CAGradientLayer else {
return;
}
let color = Color()
let leading = color.buttonLeading
let middle = color.buttonMiddle
let trailing = color.buttonTrailing
let borderColor = color.buttonBorderColor
gradientLayer.frame = bounds
gradientLayer.colors = [leading, middle, trailing]
gradientLayer.locations = [0,0.3,1]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.borderColor = borderColor
gradientLayer.borderWidth = 1
gradientLayer.cornerRadius = self.frame.width / 50
}
override class var layerClass: AnyClass {
return CAGradientLayer.self
}
}
/// Use this to set a greadient for the background.
/// = This is a greadient with a shadow.
class ButtonGradientView: UIButton {
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupView()
}
private func setupView() {
autoresizingMask = [.flexibleWidth, .flexibleHeight]
guard let gradientLayer = self.layer as? CAGradientLayer else {
return;
}
let color = Color()
let leading = color.buttonLeading
let middle = color.buttonMiddle
let trailing = color.buttonTrailing
let borderColor = color.buttonBorderColor
gradientLayer.frame = bounds
gradientLayer.colors = [leading, middle, trailing]
gradientLayer.locations = [0,0.3,1]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.borderColor = borderColor
gradientLayer.borderWidth = 1
gradientLayer.cornerRadius = self.frame.height / 2
self.layer.frame = bounds
self.layer.shadowColor = UIColor.black.cgColor
self.layer.shadowOpacity = 1
self.layer.shadowRadius = 2
self.layer.shadowOffset = CGSize(width: 2, height: 3)
}
override class var layerClass: AnyClass {
return CAGradientLayer.self
}
}
/// Use this to set a greadient for the keypad switch.
/// = This is a greadient with a shadow.
class SwitchGradientView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupView()
}
private func setupView() {
autoresizingMask = [.flexibleWidth, .flexibleHeight]
guard let gradientLayer = self.layer as? CAGradientLayer else {
return;
}
let color = Color()
let leading = color.buttonLeading
let middle = color.buttonMiddle
let trailing = color.buttonTrailing
let borderColor = color.buttonBorderColor
gradientLayer.frame = bounds
gradientLayer.colors = [leading, middle, trailing]
gradientLayer.locations = [0,0.3,1]
gradientLayer.startPoint = CGPoint(x: 0.05, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.borderColor = borderColor
gradientLayer.borderWidth = 1
gradientLayer.cornerRadius = 9
self.layer.frame = bounds
self.layer.shadowColor = UIColor.black.cgColor
self.layer.shadowOpacity = 1
self.layer.shadowRadius = 2
self.layer.shadowOffset = CGSize(width: 2, height: 3)
}
override class var layerClass: AnyClass {
return CAGradientLayer.self
}
}
I'm trying to apply a shadow and rounded corners on custom UIButton subclass to use in on the storyboard
Here is my code :
import UIKit
class customButton: UIButton {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
setGradientBackground()
setShadowLayer()
}
private func setup() {
clipsToBounds = true
layer.cornerRadius = 8
}
private func setGradientBackground() {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = bounds
gradientLayer.colors = [
UIColor(red: 0.18, green: 0.5, blue: 0.93, alpha: 1).cgColor,
UIColor(red: 0.18, green: 0.61, blue: 0.86, alpha: 1).cgColor
]
gradientLayer.locations = [0,1]
gradientLayer.startPoint = CGPoint(x: 0.25, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
layer.insertSublayer(gradientLayer, at: 0)
}
private func setShadowLayer(){
let subLayer = CALayer()
subLayer.frame = bounds
subLayer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: 8).cgPath
subLayer.shadowColor = UIColor.red.cgColor
subLayer.shadowOpacity = 1
subLayer.shadowRadius = 12
subLayer.shadowOffset = CGSize(width: 0, height: 2)
layer.insertSublayer(subLayer, at: 0)
}
}
When I'm setting the clipsToBounds to true it remove the shadow, so I decided to add a new sublayer func setShadowLayer() and nothing worked so far.
Try also setting the .cornerRadius on the gradient layer:
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
// add this line
gradientLayer.cornerRadius = 8
layer.insertSublayer(gradientLayer, at: 0)
My result:
Am trying to set CAGradientLayer for UIButton.
But it is not getting exactly. am I doing any wrong ?
am getting output like
You can see there is some horizontal line
Here is the code which I tried
let topColor = UIColor(red: 0.62, green: 0.38, blue: 1, alpha: 1).cgColor
let bottomColor = UIColor(red: 0.87, green: 0.51, blue: 0.93, alpha: 1).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.frame = myButton.bounds
gradientLayer.colors = [topColor, bottomColor]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
myButton.layer.insertSublayer(myButton, at: 0)
Create a Designable custom class like this
import Foundation
import UIKit
#IBDesignable class CustomButton:UIButton {
#IBInspectable var firstColor:UIColor = UIColor.clear {
didSet {
updateUI()
}
}
#IBInspectable var secondColor:UIColor = UIColor.clear {
didSet{
updateUI()
}
}
override class var layerClass: AnyClass {
get {
return CAGradientLayer.self
}
}
func updateUI(){
let gradient: CAGradientLayer = self.layer as! CAGradientLayer
gradient.frame = self.bounds
gradient.colors = [firstColor,secondColor].map { $0.cgColor }
gradient.locations = [0.0,1.0]
gradient.startPoint = CGPoint(x: 0.0, y: 1.0)
gradient.endPoint = CGPoint(x: 1.0, y: 1.0)
}
}
from your Identity inspector set your UIbutton class to CustomButtom like this
from your Attribute inspector change your gradient color to whatever you want to set
and finally your button will be like this
if you want to change the starting and endpoint to those colors
just play around with these two values
gradient.startPoint = CGPoint(x: 0.0, y: 1.0)
gradient.endPoint = CGPoint(x: 1.0, y: 1.0)
You have to update the gradient's frame when the view is laid out:
override func viewDidLayoutSubviews() {
myButton.layer.sublayers?.first?.frame = myButton.bounds
}
I have no idea how to set the background gradient on a button (without making the background gradient an image). This is so different from Android.
Here's a class I have to define a returnable gradient scheme:
import UIKit
extension CAGradientLayer {
func backgroundGradientColor() -> CAGradientLayer {
let topColor = UIColor(red: (0/255.0), green: (153/255.0), blue:(51/255.0), alpha: 1)
let bottomColor = UIColor(red: (0/255.0), green: (153/255.0), blue:(255/255.0), alpha: 1)
let gradientColors: [CGColor] = [topColor.CGColor, bottomColor.CGColor]
let gradientLocations: [Float] = [0.0, 1.0]
let gradientLayer: CAGradientLayer = CAGradientLayer()
gradientLayer.colors = gradientColors
gradientLayer.locations = gradientLocations
return gradientLayer
}
}
I can use this to set the background of my entire view with the following:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let background = CAGradientLayer().backgroundGradientColor()
background.frame = self.view.bounds
self.view.layer.insertSublayer(background, atIndex: 0)
}
//...
}
But how can I access the view of the button and insert the sublayer or something like that?
Your code works fine. You just have to remember to set the gradient's frame every time. It is better to just make the gradient category also set the frame of the view for you.
That way you don't forget and it applies fine.
import UIKit
extension UIView {
func applyGradient(colours: [UIColor]) -> CAGradientLayer {
return self.applyGradient(colours: colours, locations: nil)
}
func applyGradient(colours: [UIColor], locations: [NSNumber]?) -> CAGradientLayer {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.locations = locations
self.layer.insertSublayer(gradient, at: 0)
return gradient
}
}
class ViewController: UIViewController {
#IBOutlet weak var btn: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
self.btn.applyGradient(colours: [.yellow, .blue])
self.view.applyGradient(colours: [.yellow, .blue, .red], locations: [0.0, 0.5, 1.0])
}
}
Buttons are views. You apply gradients to it the same way you would apply it to any other view.
Picture Proof:
Video Proof:
https://i.imgur.com/ssDTqPu.mp4
It's this simple:
import UIKit
class ActualGradientButton: UIButton {
override func layoutSubviews() {
super.layoutSubviews()
gradientLayer.frame = bounds
}
private lazy var gradientLayer: CAGradientLayer = {
let l = CAGradientLayer()
l.frame = self.bounds
l.colors = [UIColor.systemYellow.cgColor, UIColor.systemPink.cgColor]
l.startPoint = CGPoint(x: 0, y: 0.5)
l.endPoint = CGPoint(x: 1, y: 0.5)
l.cornerRadius = 16
layer.insertSublayer(l, at: 0)
return l
}()
}
Here below you can find the solution for Swift3 (and Swift4 too) and a little bit extended (orientation helper):
typealias GradientPoints = (startPoint: CGPoint, endPoint: CGPoint)
enum GradientOrientation {
case topRightBottomLeft
case topLeftBottomRight
case horizontal
case vertical
var startPoint : CGPoint {
return points.startPoint
}
var endPoint : CGPoint {
return points.endPoint
}
var points : GradientPoints {
switch self {
case .topRightBottomLeft:
return (CGPoint(x: 0.0,y: 1.0), CGPoint(x: 1.0,y: 0.0))
case .topLeftBottomRight:
return (CGPoint(x: 0.0,y: 0.0), CGPoint(x: 1,y: 1))
case .horizontal:
return (CGPoint(x: 0.0,y: 0.5), CGPoint(x: 1.0,y: 0.5))
case .vertical:
return (CGPoint(x: 0.0,y: 0.0), CGPoint(x: 0.0,y: 1.0))
}
}
}
extension UIView {
func applyGradient(with colours: [UIColor], locations: [NSNumber]? = nil) {
let gradient = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.locations = locations
self.layer.insertSublayer(gradient, at: 0)
}
func applyGradient(with colours: [UIColor], gradient orientation: GradientOrientation) {
let gradient = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.startPoint = orientation.startPoint
gradient.endPoint = orientation.endPoint
self.layer.insertSublayer(gradient, at: 0)
}
}
#Zeb answer is great but just to clean it up and make it a little more swifty.
Computed read-only properties should avoid using get and returning Void is redundant:
typealias GradientPoints = (startPoint: CGPoint, endPoint: CGPoint)
enum GradientOrientation {
case topRightBottomLeft
case topLeftBottomRight
case horizontal
case vertical
var startPoint: CGPoint {
return points.startPoint
}
var endPoint: CGPoint {
return points.endPoint
}
var points: GradientPoints {
switch self {
case .topRightBottomLeft:
return (CGPoint(x: 0.0, y: 1.0), CGPoint(x: 1.0, y: 0.0))
case .topLeftBottomRight:
return (CGPoint(x: 0.0, y: 0.0), CGPoint(x: 1, y: 1))
case .horizontal:
return (CGPoint(x: 0.0, y: 0.5), CGPoint(x: 1.0, y: 0.5))
case .vertical:
return (CGPoint(x: 0.0, y: 0.0), CGPoint(x: 0.0, y: 1.0))
}
}
}
extension UIView {
func applyGradient(withColours colours: [UIColor], locations: [NSNumber]? = nil) {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.locations = locations
self.layer.insertSublayer(gradient, at: 0)
}
func applyGradient(withColours colours: [UIColor], gradientOrientation orientation: GradientOrientation) {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.startPoint = orientation.startPoint
gradient.endPoint = orientation.endPoint
self.layer.insertSublayer(gradient, at: 0)
}
}
If you want a gradient background on a button, rather than adding the gradient as a sublayer and changing its frame in layoutSubviews, I would instead just specify the layerClass of the button to be a CAGradientLayer, so the main layer is a gradient:
#IBDesignable
public class GradientButton: UIButton {
public override class var layerClass: AnyClass { CAGradientLayer.self }
private var gradientLayer: CAGradientLayer { layer as! CAGradientLayer }
#IBInspectable public var startColor: UIColor = .white { didSet { updateColors() } }
#IBInspectable public var endColor: UIColor = .red { didSet { updateColors() } }
// expose startPoint and endPoint to IB
#IBInspectable public var startPoint: CGPoint {
get { gradientLayer.startPoint }
set { gradientLayer.startPoint = newValue }
}
#IBInspectable public var endPoint: CGPoint {
get { gradientLayer.endPoint }
set { gradientLayer.endPoint = newValue }
}
// while we're at it, let's expose a few more layer properties so we can easily adjust them in IB
#IBInspectable public var cornerRadius: CGFloat {
get { layer.cornerRadius }
set { layer.cornerRadius = newValue }
}
#IBInspectable public var borderWidth: CGFloat {
get { layer.borderWidth }
set { layer.borderWidth = newValue }
}
#IBInspectable public var borderColor: UIColor? {
get { layer.borderColor.flatMap { UIColor(cgColor: $0) } }
set { layer.borderColor = newValue?.cgColor }
}
// init methods
public override init(frame: CGRect = .zero) {
super.init(frame: frame)
updateColors()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
updateColors()
}
}
private extension GradientButton {
func updateColors() {
gradientLayer.colors = [startColor.cgColor, endColor.cgColor]
}
}
By setting the layerClass, it will just make the main layer be a gradient, which automatically is adjusted to the bounds of the button for you. This has an advantage that if you animate the changing of the button size (e.g. on rotation events or whatever), the gradient will be correctly animated, too.
And, it is not necessary, but it may be convenient to make this class an #IBDesignable, so one can set its properties in IB, and it will be correctly rendered in the storyboard/NIB with no additional code in the view controller. For example, I can customize the corners, border, and gradient colors and direction in IB:
Try this is working for me ,
let button = UIButton(frame: CGRect(x: 60, y: 150, width: 200, height: 60))
button.setTitle("Email", for: .normal)
button.backgroundColor = .red
button.setTitleColor(UIColor.black, for: .normal)
button.addTarget(self, action: #selector(self.buttonTapped), for: .touchUpInside)
// Apply Gradient Color
let gradientLayer:CAGradientLayer = CAGradientLayer()
gradientLayer.frame.size = button.frame.size
gradientLayer.colors =
[UIColor.white.cgColor,UIColor.green.withAlphaComponent(1).cgColor]
//Use diffrent colors
button.layer.addSublayer(gradientLayer)
self.view.addSubview(button)
You can add starting and end point of gradient color.
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.0)
For more details description refer CAGradientLayer doc
I have tried all of them this is my button init inside of viewdidload
let button = UIButton()
button.setTitle("Alper", for: .normal)
button.layer.borderColor = UIColor.white.cgColor
button.layer.borderWidth = 1
view.addSubview(button)
button.anchor(top: nil, left: nil, bottom: logo.topAnchor, right: nil, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, height: 50, width: 100)
let gradientx = CAGradientLayer()
gradientx.colors = [UIColor.blue,UIColor.red]
gradientx.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientx.endPoint = CGPoint(x: 1.0, y: 1.0)
gradientx.frame = button.bounds
button.layer.insertSublayer(gradientx, at: 0)
anchor is an extension, so this is irrelevant gradient.
There are already many answers there I want add what I did to achieve this. I use this custom Button GradientButton
import Foundation
import UIKit
class GradientButton: UIButton {
let gradientColors : [UIColor]
let startPoint : CGPoint
let endPoint : CGPoint
required init(gradientColors: [UIColor] = [UIColor.red, UIColor.blue],
startPoint: CGPoint = CGPoint(x: 0, y: 0.5),
endPoint: CGPoint = CGPoint(x: 1, y: 0.5)) {
self.gradientColors = gradientColors
self.startPoint = startPoint
self.endPoint = endPoint
super.init(frame: .zero)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
let halfOfButtonHeight = layer.frame.height / 2
contentEdgeInsets = UIEdgeInsets(top: 10, left: halfOfButtonHeight, bottom: 10, right: halfOfButtonHeight)
layer.anchorPoint = CGPoint(x: 0.5, y: 0.5)
backgroundColor = UIColor.clear
// setup gradient
let gradient = CAGradientLayer()
gradient.frame = bounds
gradient.colors = gradientColors.map { $0.cgColor }
gradient.startPoint = startPoint
gradient.endPoint = endPoint
gradient.cornerRadius = 4
// replace gradient as needed
if let oldGradient = layer.sublayers?[0] as? CAGradientLayer {
layer.replaceSublayer(oldGradient, with: gradient)
} else {
layer.insertSublayer(gradient, below: nil)
}
// setup shadow
layer.shadowColor = UIColor.darkGray.cgColor
layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: halfOfButtonHeight).cgPath
layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
layer.shadowOpacity = 0.85
layer.shadowRadius = 4.0
}
override var isHighlighted: Bool {
didSet {
let newOpacity : Float = isHighlighted ? 0.6 : 0.85
let newRadius : CGFloat = isHighlighted ? 6.0 : 4.0
let shadowOpacityAnimation = CABasicAnimation()
shadowOpacityAnimation.keyPath = "shadowOpacity"
shadowOpacityAnimation.fromValue = layer.shadowOpacity
shadowOpacityAnimation.toValue = newOpacity
shadowOpacityAnimation.duration = 0.1
let shadowRadiusAnimation = CABasicAnimation()
shadowRadiusAnimation.keyPath = "shadowRadius"
shadowRadiusAnimation.fromValue = layer.shadowRadius
shadowRadiusAnimation.toValue = newRadius
shadowRadiusAnimation.duration = 0.1
layer.add(shadowOpacityAnimation, forKey: "shadowOpacity")
layer.add(shadowRadiusAnimation, forKey: "shadowRadius")
layer.shadowOpacity = newOpacity
layer.shadowRadius = newRadius
let xScale : CGFloat = isHighlighted ? 1.025 : 1.0
let yScale : CGFloat = isHighlighted ? 1.05 : 1.0
UIView.animate(withDuration: 0.1) {
let transformation = CGAffineTransform(scaleX: xScale, y: yScale)
self.transform = transformation
}
}
}
}
You can make GradientButton instance like this.
let button = GradientButton.init(gradientColors:[UIColor.black, UIColor.white], startPoint: CGPoint(x: 0, y: 0), endPoint: CGPoint(x: 0, y: 1))
For Swift
extension UIViewController {
func makeGradientColor(`for` object : AnyObject , startPoint : CGPoint , endPoint : CGPoint) -> CAGradientLayer {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.colors = [(UIColor.red.cgColor), (UIColor.yellow.cgColor)]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = startPoint
gradient.endPoint = endPoint
gradient.frame = CGRect(x: 0.0, y: 0.0, width: object.bounds.size.width, height: object.bounds.size.height)
return gradient
}
}
How to use ?
if let layers = btn.layer.sublayers{
for layer in layers {
if layer.isKind(of: CAGradientLayer.self) {
layer.removeFromSuperlayer()
}
}
}
let start : CGPoint = CGPoint(x: 0.0, y: 0.0)
let end : CGPoint = CGPoint(x: 1.0, y: 1.0)
let gradient: CAGradientLayer = self.makeGradientColor(for: cell.bgView, startPoint: start, endPoint: end)
btn.layer.insertSublayer(gradient, at: 0)
I've modified this great answer to improve the reusability of the button by adding init parameters for colors, radius, and gradient direction.
I also added updateGradientColors method as it might be useful if you want to change the gradient color at some point.
class GradientButton: UIButton {
private let colors: [UIColor]
private let cornerRadius: CGFloat
private let startPoint: CGPoint
private let endPoint: CGPoint
required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
init(colors: [UIColor],
cornerRadius: CGFloat = 10,
startPoint: CGPoint = CGPoint(x: 0, y: 0.5),
endPoint: CGPoint = CGPoint(x: 1, y: 0.5)) {
self.colors = colors
self.cornerRadius = cornerRadius
self.startPoint = startPoint
self.endPoint = endPoint
super.init(frame: .zero)
}
override func layoutSubviews() {
super.layoutSubviews()
gradientLayer.frame = bounds
}
private lazy var gradientLayer: CAGradientLayer = {
let gl = CAGradientLayer()
gl.frame = self.bounds
gl.colors = colors.map { $0.cgColor }
gl.startPoint = startPoint
gl.endPoint = endPoint
gl.cornerRadius = cornerRadius
layer.insertSublayer(gl, at: 0)
return gl
}()
func updateGradientColors(_ colors: [UIColor]) {
gradientLayer.colors = colors.map { $0.cgColor }
}
}
Gradient Button with corner radius, start and End Points Code is here...
extension UIView {
func applyGradient(colours: [UIColor], cornerRadius: CGFloat?, startPoint: CGPoint, endPoint: CGPoint) {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = self.bounds
if let cornerRadius = cornerRadius {
gradient.cornerRadius = cornerRadius
}
gradient.startPoint = startPoint
gradient.endPoint = endPoint
gradient.colors = colours.map { $0.cgColor }
self.layer.insertSublayer(gradient, at: 0)
}
}
Usage :
self.yourButton.applyGradient(colours: [.red, .green], cornerRadius: 20, startPoint: CGPoint(x: 0, y: 0.5), endPoint: CGPoint(x: 1, y: 0.5))
class ButtonGradient : UIButton {
override func layoutSubviews() {
let layer : CAGradientLayer = CAGradientLayer()
layer.frame.size = self.frame.size
layer.frame.origin = CGPoint(x: 0, y: 0)
// layer.cornerRadius = CGFloat(frame.width / 20)
let color0 = UIColor(red:255/255, green:122/255, blue:0/255, alpha:1.0).cgColor
let color1 = UIColor(red:255/255, green:176/255, blue: 0/255, alpha:1.0).cgColor
let color2 = UIColor(red:250/255, green:98/255, blue: 44/255, alpha:1.0).cgColor
layer.locations = [0.5, 1.0]
layer.startPoint = CGPoint(x: 0.0, y: 0.5)
layer.endPoint = CGPoint(x: 0.5, y: 0.5)
layer.colors = [color2,color0,color1]
self.layer.insertSublayer(layer, at: 0)
}
}
After that directly assign "ButtonGredient" class to particular button in Storyboard.
Here, I have taken one UIView and add button in it.
#IBOutlet weak var btnCenter: UIButton!
#IBOutlet weak var viewCenter: UIView!
// Create a gradient layer
let gradient = CAGradientLayer()
// gradient colors in order which they will visually appear
gradient.colors = [UIColor.yello.cgColor, UIColor.blue.cgColor]
// Gradient from left to right
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
// set the gradient layer to the same size as the view
gradient.frame = viewCenter.bounds
// add the gradient layer to the views layer for rendering
viewCenter.layer.insertSublayer(gradient, at: 0)
// Tha magic! Set the button as the views mask
viewCenter.mask = btnCenter
//Set corner Radius and border Width of button
btnCenter.layer.cornerRadius = btnCenter.frame.size.height / 2
btnCenter.layer.borderWidth = 5.0
There are ways to work with initial layer without making sublayers.
import UIKit
#IBDesignable class GradientButton: UIButton {
#IBInspectable var startColor: UIColor = UIColor.white
#IBInspectable var endColor: UIColor = UIColor.white
#IBInspectable var cornerRadius = CGFloat(5.0)
override class var layerClass: AnyClass {
return CAGradientLayer.self
}
override func layoutSubviews() {
super.layoutSubviews()
//This is an advanced gradient we do not use for now
// (layer as! CAGradientLayer).startPoint = CGPoint(x: 0, y: 0)
// (layer as! CAGradientLayer).endPoint = CGPoint(x: 1, y: 1)
// (layer as! CAGradientLayer).locations = [0,1]
// Simple gradient
(layer as! CAGradientLayer).colors = [startColor.cgColor, endColor.cgColor]
layer.cornerRadius = cornerRadius
}
}
class GradientButton: UIButton {
var gradientLayer: CAGradientLayer? {
didSet {
layer.sublayers?.filter { $0 is CAGradientLayer }.forEach { $0.removeFromSuperlayer() }
if let gradientLayer = gradientLayer {
layer.insertSublayer(gradientLayer, at: 0)
}
}
}
override func layoutSubviews() {
super.layoutSubviews()
gradientLayer?.frame = self.bounds
}
}