var navigationImageView:UIImageView! = UIImageView()
navigationImageView.frame = (0,0,320,64)
var gradient = CAGradientLayer()
let gradientDark = UIColor(red: 148/255.0, green:210/255.0, blue: 245/255.0, alpha: 1.0)
let gradientLight = UIColor(red: 222/255.0, green:247/255.0, blue: 230/255.0, alpha: 1.0)
let gradientLight1 = UIColor(red: 245/255.0, green:247/255.0, blue: 206/255.0, alpha: 1.0)
gradient.frame = navigationImageView.bounds
let color1 = gradientDark.cgColor
let color2 = gradientLight.cgColor
let color3 = gradientLight1.cgColor
gradient.colors = [color1, color2, color3]
gradient.colors = [gradientDark.cgColor,gradientLight.cgColor,gradientLight1.cgColor];
navigationImageView.layer.insertSublayer(gradient, at: 0)
Its not working... How to se the cgradient image backgorund colour?
You can make image from gradient and set it in imageView
let gradient = CAGradientLayer()
let screenWidth = UIScreen.main.bounds.size.width
let defaultNavigationBarFrame = CGRect(x: 0, y: 0, width: screenWidth, height: 64)
gradient.frame = defaultNavigationBarFrame
//colors
let gradientDark = UIColor(red: 148/255.0, green:210/255.0, blue: 245/255.0, alpha: 1.0)
let gradientLight = UIColor(red: 222/255.0, green:247/255.0, blue: 230/255.0, alpha: 1.0)
let gradientLight1 = UIColor(red: 245/255.0, green:247/255.0, blue: 206/255.0, alpha: 1.0)
gradient.colors = [gradientDark.cgColor,gradientLight.cgColor,gradientLight1.cgColor]
// Create image.
let imageBG: UIImage = self.gradientImage(fromLayer: gradient)
If you want to set it in navigation bar.
self.navigationController?.navigationBar.setBackgroundImage(imageBG,
for: .default)
Create image from gradient.
func gradientImage(fromLayer layer: CALayer) -> UIImage {
UIGraphicsBeginImageContext(layer.frame.size)
layer.render(in: UIGraphicsGetCurrentContext()!)
let outputImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return outputImage!
}
Related
I'm setting the image of the navigation bar to a gradient. This works perfectly on all models except for iPhone 12 mini.
I've tried calling this on my main view controller in ViewWillAppear, viewDidAppear, and ViewDidLoad
Here's what it looks like on all other models
func setNavGradiant(){
guard let navigationController = self.navigationController else {print("❇️♊️>>>\(#file) \(#line): guard let failed<<<"); return}
let gradientLayer = CAGradientLayer()
var updatedFrame = navigationController.navigationBar.bounds
updatedFrame.size.height += UIApplication.shared.windows[0].windowScene?.statusBarManager?.statusBarFrame.height ?? 0
gradientLayer.frame = updatedFrame
gradientLayer.colors = [ #colorLiteral(red: 0.4392156899, green: 0.01176470611, blue: 0.1921568662, alpha: 1).cgColor, #colorLiteral(red: 0.2196078449, green: 0.007843137719, blue: 0.8549019694, alpha: 1).cgColor] // start color and end color
gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.0) // vertical gradient start
gradientLayer.endPoint = CGPoint(x: 0.5, y: 1.0)
UIGraphicsBeginImageContext(gradientLayer.bounds.size)
gradientLayer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
self.navigationController?.navigationBar.setBackgroundImage(image, for: UIBarMetrics.default)
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor(#colorLiteral(red: 0.9579688907, green: 0.9579688907, blue: 0.9579688907, alpha: 1))]
}
You will probably have better results by subclassing UINavigationController:
class MyNavigationController: UINavigationController {
let gradient = CAGradientLayer()
override func viewDidLoad() {
super.viewDidLoad()
gradient.frame = navigationBar.bounds
gradient.colors = [ #colorLiteral(red: 0.4392156899, green: 0.01176470611, blue: 0.1921568662, alpha: 1).cgColor, #colorLiteral(red: 0.2196078449, green: 0.007843137719, blue: 0.8549019694, alpha: 1).cgColor] // start color and end color
gradient.startPoint = CGPoint(x: 0.5, y: 0.0) // vertical gradient start
gradient.endPoint = CGPoint(x: 0.5, y: 1.0)
if let image = getImageFrom(gradientLayer: gradient) {
navigationBar.setBackgroundImage(image, for: UIBarMetrics.default)
}
}
func getImageFrom(gradientLayer:CAGradientLayer) -> UIImage? {
var gradientImage:UIImage?
UIGraphicsBeginImageContext(gradientLayer.frame.size)
if let context = UIGraphicsGetCurrentContext() {
gradientLayer.render(in: context)
gradientImage = UIGraphicsGetImageFromCurrentImageContext()?.resizableImage(withCapInsets: UIEdgeInsets.zero, resizingMode: .stretch)
}
UIGraphicsEndImageContext()
return gradientImage
}
}
Try calling:
DispatchQueue.main.async {
self.setNeedsStatusBarAppearanceUpdate()
}
after your setup is done. Should work without dispatching to main thread, but I had previously caught issues of things called from lifecycle methods not being on the main thread. So another thing to check is to make sure you are running the updates on the main thread.
I'm trying to draw a gradient to UILabel, but it draws only the colors I can't see the text.
I saw the code from here StackOverflow
my modification:
extension String{
func gradient(x:CGFloat,y:CGFloat, fontSize:CGFloat)->UIImage{
let font:UIFont = UIFont.systemFontOfSize(fontSize)
let name:String = NSFontAttributeName
let textSize: CGSize = self.sizeWithAttributes([name:font])
let width:CGFloat = textSize.width // max 1024 due to Core Graphics limitations
let height:CGFloat = textSize.height // max 1024 due to Core Graphics limitations
UIGraphicsBeginImageContext(CGSizeMake(width, height))
let context = UIGraphicsGetCurrentContext()
UIGraphicsPushContext(context!)
//draw gradient
let glossGradient:CGGradientRef?
let rgbColorspace:CGColorSpaceRef?
let num_locations:size_t = 2
let locations:[CGFloat] = [ 0.0, 1.0 ]
let components:[CGFloat] = [(202 / 255.0), (197 / 255.0), (52 / 255.0), 1.0, // Start color
(253 / 255.0), (248 / 255.0), (101 / 255.0), 1.0] // End color
rgbColorspace = CGColorSpaceCreateDeviceRGB()
glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations)
let topCenter = CGPointMake(0, 0);
let bottomCenter = CGPointMake(0, textSize.height);
CGContextDrawLinearGradient(context, glossGradient, topCenter, bottomCenter, CGGradientDrawingOptions.DrawsBeforeStartLocation)
UIGraphicsPopContext()
let gradientImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return gradientImage
}
}
and the setup of the imageView
self.timeLeftIV = UIImageView(frame: CGRectMake(self.pyramidFakeView.frame.origin.x/2-25,0, 100,20))
self.timeLeftIV.image = "59:48".gradient(timeLeftIV.frame.origin.x, y: timeLeftIV.frame.origin.y, fontSize: 6.0)
the result of the code:
There is an easier way of getting a gradient as a UIImage. You can use a CAGradientLayer. For example:
func yellowGradientImage(bounds:CGRect) -> UIImage
{
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [UIColor(red: (202 / 255.0), green: (197 / 255.0), blue: (52 / 255.0), alpha: 1.0).CGColor, UIColor(red: (253 / 255.0), green: (248 / 255.0), blue: (101 / 255.0), alpha: 1.0).CGColor]
gradientLayer.bounds = bounds
UIGraphicsBeginImageContextWithOptions(gradientLayer.bounds.size, true, 0.0)
let context = UIGraphicsGetCurrentContext()
gradientLayer.renderInContext(context!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
To apply the gradient to text you next need to use the image returned as the textColor using UIColor(patternImage: ...). For example:
let label = UILabel()
label.font = UIFont.systemFontOfSize(150.0)
label.text = "HELLO WORLD"
label.sizeToFit()
let image = yellowGradientImage(label.bounds)
label.textColor = UIColor(patternImage: image)
Which results in:
swift 3.0:
func yellowGradientImage(bounds:CGRect) -> UIImage
{
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [UIColor(red: (202 / 255.0), green: (197 / 255.0), blue: (52 / 255.0), alpha: 1.0).cgColor, UIColor(red: (253 / 255.0), green: (248 / 255.0), blue: (101 / 255.0), alpha: 1.0).cgColor]
gradientLayer.bounds = bounds
UIGraphicsBeginImageContextWithOptions(gradientLayer.bounds.size, true, 0.0)
let context = UIGraphicsGetCurrentContext()
gradientLayer.render(in: context!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
let label = UILabel()
label.font = UIFont.systemFont(ofSize: 150.0)
label.text = "HELLO WORLD"
label.sizeToFit()
let image = yellowGradientImage(bounds: label.bounds)
label.textColor = UIColor(patternImage: image)
add a view, modify draw rect with below code.
override func drawRect(rect: CGRect) {
// Drawing code
let currentContext = UIGraphicsGetCurrentContext()
CGContextSaveGState(currentContext);
let colorSpace = CGColorSpaceCreateDeviceRGB()
let startColor = UIColor(red: 0.1, green: 0.0, blue: 0.0, alpha: 0.0)
let startColorComponents = CGColorGetComponents(startColor.CGColor)
let middleColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.2)
let middleColorComponents = CGColorGetComponents(middleColor.CGColor)
let lowerMiddleColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.3)
let lowerMiddleColorComponents = CGColorGetComponents(lowerMiddleColor.CGColor)
let endColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.5)
let endColorComponents = CGColorGetComponents(endColor.CGColor)
var colorComponents = [startColorComponents[0], startColorComponents[1], startColorComponents[2], startColorComponents[3], middleColorComponents[0], middleColorComponents[1], middleColorComponents[2], middleColorComponents[3], lowerMiddleColorComponents[0], lowerMiddleColorComponents[1], lowerMiddleColorComponents[2], lowerMiddleColorComponents[3], endColorComponents[0], endColorComponents[1], endColorComponents[2], endColorComponents[3]]
var locations:[CGFloat] = [0.0, 0.6, 0.8, 1.0]
let gradient = CGGradientCreateWithColorComponents(colorSpace,&colorComponents,&locations,4)
let startPoint = CGPointMake(0, 0)
let endPoint = CGPointMake(0, self.bounds.height)
CGContextAddRect(currentContext, CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height));
CGContextClip(currentContext);
CGContextDrawLinearGradient(currentContext,gradient,startPoint,endPoint, CGGradientDrawingOptions.DrawsBeforeStartLocation)
CGContextRestoreGState(currentContext)
}
Now in storyboard add a view change class to your gradient class and add a label to this view.
See if it works for you.
On iPhone 8 :
On iPhone X :
The issue lies with status bar. The is nothing exclusive I am doing here. It is just that the color is a gradient one, but it should not matter.
ViewController's attributes :
Function for setting gradient :
func setNavigationBarAppearence() {
let gradient = CAGradientLayer()
let sizeLength = UIScreen.main.bounds.size.height * 2
let defaultNavigationBarFrame = CGRect(x: 0, y: 0, width: sizeLength, height: self.navigationController.navigationBar.frame.size.height)
gradient.frame = defaultNavigationBarFrame
gradient.colors = [UIColor(red: 30/255, green: 234/255, blue: 191/255, alpha: 1).cgColor, UIColor(red: 12/255, green: 198/255, blue: 183/255, alpha: 1).cgColor]
UINavigationBar.appearance().setBackgroundImage(self.image(fromLayer: gradient), for: .default)
UINavigationBar.appearance().tintColor = UIColor.white
}
func image(fromLayer layer: CALayer) -> UIImage {
UIGraphicsBeginImageContext(layer.frame.size)
layer.render(in: UIGraphicsGetCurrentContext()!)
let outputImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return outputImage!
}
Try this approch. May this solve your problem
/// Applies a background gradient with the given colors
func apply(gradient colors : [CGColor]) {
var frameAndStatusBar: CGRect = self.bounds
frameAndStatusBar.size.height += UIApplication.shared.statusBarFrame.height
let gradient = CAGradientLayer()
gradient.frame = frameAndStatusBar
gradient.colors = colors
// gradient.locations = [0.0,1.0]
gradient.startPoint = CGPoint.init(x: 0.0, y: 0.0)
gradient.endPoint = CGPoint.init(x: 0.0, y: 1.0)
if let img = self.image(fromLayer: gradient)
{
setBackgroundImage(img, for: .default)
}
}
/// Creates a gradient image with the given settings
func image(fromLayer layer: CALayer) -> UIImage? {
UIGraphicsBeginImageContext(layer.frame.size)
if let context = UIGraphicsGetCurrentContext()
{
layer.render(in:context)
let outputImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return outputImage
}
return nil
}
Here is how I used this:
extension CAGradientLayer {
convenience init(frame: CGRect, colors: [UIColor]) {
self.init()
self.frame = frame
self.colors = []
for color in colors {
self.colors?.append(color.cgColor)
}
startPoint = CGPoint(x: 0, y: 0)
endPoint = CGPoint(x: 0, y: 1)
}
func createGradientImage() -> UIImage? {
var image: UIImage? = nil
UIGraphicsBeginImageContext(bounds.size)
if let context = UIGraphicsGetCurrentContext() {
render(in: context)
image = UIGraphicsGetImageFromCurrentImageContext()
}
UIGraphicsEndImageContext()
return image
}
}
extension UINavigationBar {
func setGradientBackground(colors: [UIColor]) {
var updatedFrame = bounds
updatedFrame.size.height += self.frame.origin.y
// above adjustment is important, otherwise the frame is considered without
// the status bar height which in turns causes the gradient layer to be calculated wrong
let gradientLayer = CAGradientLayer(frame: updatedFrame, colors: colors)
setBackgroundImage(gradientLayer.createGradientImage(), for: .default)
}
}
Usage:
override func viewDidLoad() {
...
let colors = [UIColor(red: 30/255, green: 234/255, blue: 191/255, alpha: 1), UIColor(red: 12/255, green: 198/255, blue: 183/255, alpha: 1)]
navigationController?.navigationBar.setGradientBackground(colors: colors)
...
}
This was related to the total height of navigation bar + status bar. I fixed it as follows :
func setNavigationBarAppearence() {
let gradient = CAGradientLayer()
let sizeLength = UIScreen.main.bounds.size.height * 2
var defaultNavigationBarFrame = CGRect(x: 0, y: 0, width: sizeLength, height: self.navigationController.navigationBar.frame.size.height)
if UIDevice().userInterfaceIdiom == .phone {
if UIScreen.main.nativeBounds.height == 2436{
defaultNavigationBarFrame.size.height += 44
} else {
defaultNavigationBarFrame.size.height += 20
}
}
gradient.frame = defaultNavigationBarFrame
gradient.colors = [UIColor(red: 30/255, green: 234/255, blue: 191/255, alpha: 1).cgColor, UIColor(red: 12/255, green: 198/255, blue: 183/255, alpha: 1).cgColor]
UINavigationBar.appearance().setBackgroundImage(self.image(fromLayer: gradient), for: .default)
UINavigationBar.appearance().tintColor = UIColor.white
}
func image(fromLayer layer: CALayer) -> UIImage {
UIGraphicsBeginImageContext(layer.frame.size)
layer.render(in: UIGraphicsGetCurrentContext()!)
let outputImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return outputImage!
}
Not the perfect fix I would say, but a working alternative.
I am trying to make scroll view with gradient background color, but it shows me gradient color only and could not see scroll view! No error waning.
mainScrollView.frame = view.frame
imageArray = [#imageLiteral(resourceName: "business-improvement"), #imageLiteral(resourceName: "IMG_3601"), #imageLiteral(resourceName: "IMG_4261"), #imageLiteral(resourceName: "IMG_4264")]
for i in 0..<imageArray.count{
let imageView = UIImageView()
imageView.image = imageArray[i]
imageView.contentMode = .scaleAspectFit
let xPosition = self.view.frame.width * CGFloat(i)
imageView.frame = CGRect(x: xPosition, y:0, width: self.mainScrollView.frame.width, height: self.mainScrollView.frame.height)
let mainScrollView = CAGradientLayer()
self.view.backgroundColor = UIColor(red: 0.01, green:0.34, blue: 0.38, alpha: 1.0)
mainScrollView.frame = self.view.bounds
let color1 = UIColor(red: 0.11, green:0.04, blue: 0.32, alpha: 1.0).cgColor
let color2 = UIColor(red: 0.0, green:0.18, blue: 0.20, alpha: 1.0).cgColor
mainScrollView.colors = [color1, color2]
mainScrollView.frame = CGRect(x: 0, y: 0, width: 375, height: 690)
self.view.layer.addSublayer(mainScrollView)
I try the same and this works for me :
self.MyItem.applyGradient_2(colours: [UIColor(red:0.09, green:0.91, blue:0.65, alpha:1.0), UIColor(red:0.08, green:0.92, blue:0.43, alpha:1.0)])
extension UIView {
func applyGradient_2(colours: [UIColor]) -> Void {
self.applyGradient_(colours: colours, locations: nil)
}
func applyGradient_(colours: [UIColor], locations: [NSNumber]?) -> Void {
let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = self.bounds
gradient.colors = colours.map { $0.cgColor }
gradient.locations = locations
self.layer.insertSublayer(gradient, at: 0)
}
}
I want to color from touchpoint of gradient layer.
I tried this :
func viewtap(sender: UITapGestureRecognizer) {
let touchPoint = sender.locationInView(self.gradientview) // Change to whatever view you want the point for
print("\(touchPoint))")
colorOfPoint(touchPoint)
}
This method I used but it gives original color only.
func colorOfPoint(point:CGPoint) -> UIColor
{
let colorSpace:CGColorSpace = CGColorSpaceCreateDeviceRGB()!
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedLast.rawValue)
var pixelData:[UInt8] = [0, 0, 0, 0]
let context = CGBitmapContextCreate(&pixelData, 1, 1, 8, 4, colorSpace, bitmapInfo.rawValue)
CGContextTranslateCTM(context, -point.x, -point.y);
self.view.layer.renderInContext(context!)
let red:CGFloat = CGFloat(pixelData[0])/CGFloat(255.0)
let green:CGFloat = CGFloat(pixelData[1])/CGFloat(255.0)
let blue:CGFloat = CGFloat(pixelData[2])/CGFloat(255.0)
let alpha:CGFloat = CGFloat(pixelData[3])/CGFloat(255.0)
let color:UIColor = UIColor(red: red, green: green, blue: blue, alpha: alpha)
colorChange.tintColor = UIColor(red: red, green: green, blue: blue, alpha: alpha)
return color
}
Gradient Layer:
Always give .CGColor after uicolor. now i will pick color from any in UIView
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.shadowview.bounds
let colorTop = UIColor(red:CGFloat(RedColor)/255.0 , green: CGFloat (GreenColor)/255.0 , blue: CGFloat(BlueColor)/255.0,alpha: CGFloat(alphalab)/255.0)**.CGColor**
let colorBottom = UIColor(red: 35.0/255.0, green: 2.0/255.0, blue: 2.0/255.0, alpha: 1.0)**.CGColor**
colorChange.tintColor = UIColor(red:CGFloat(RedColor)/255.0 , green: CGFloat (GreenColor)/255.0 , blue: CGFloat(BlueColor)/255.0,alpha: CGFloat(alphalab)/255.0)
gradientLayer.colors = [colorTop, colorBottom]
gradientLayer.startPoint = CGPoint(x: 1.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.locations = [ 0.0, 1.0]
self.shadowview.layer.addSublayer(gradientLayer)