I am trying to achieve something as this:
However I am getting this:
Code I am using:
let border = CALayer()
border.backgroundColor = UIColor.viewShadowGray().cgColor
border.frame = CGRect(x: 0, y: 0, width: bottomView.frame.size.width, height: 2)
bottomView.layer.addSublayer(border)
class func viewShadowGray() -> UIColor
{
return UIColor(red: 177.0/255.0, green: 177.0/255.0, blue: 179.0/255.0, alpha: 0.7)
}
Create a shadow with UIBezierPath something like as below.
You may need to vary opacity (layer?.shadowOpacity = 0.80) and shadow radius (layer?.shadowRadius = 3.0) to match your requirement .
func addShadow(to view: UIView?) {
//Adds a shadow to view
let layer: CALayer? = view?.layer
layer?.shadowOffset = CGSize(width: 0, height: 3)
layer?.shadowColor = UIColor.black.cgColor
layer?.shadowRadius = 3.0
layer?.shadowOpacity = 0.80
layer?.shadowPath = (UIBezierPath(rect: CGRect(x: layer?.bounds.origin.x ?? 0.0, y: layer?.bounds.origin.y ?? 0.0, width: layer?.bounds.size.width ?? 0.0, height: (layer?.bounds.size.height ?? 0.0) + 1))).cgPath
}
Related
I am new in swift and I am trying to add shadow to UIView.
My code is like this
ViewPay.layer.masksToBounds = false
ViewPay.layer.shadowRadius = 2
ViewPay.layer.shadowOpacity = 1
ViewPay.layer.shadowColor = UIColor.red.cgColor
ViewPay.layer.shadowOffset = CGSize(width: 0 , height:2)
but it is adding shadow to all side
How can I add shadow like this
One solution is, put your ViewPay inside a container UIView.
Set your ViewPay to leading and trailing edges of container view, and for top and bottom add some padding to show shadow.
Also set container view clipsToBounds equals to true.
I hope to help with the solution of your question. In case you wanted something simple to understand, and also following the tips. You create a large container and add the required views. A vertical view of the purple color, another horizontal that would be gray color and in the middle put an image, as I did in the code:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//Big container
let container = UIView(frame: CGRect(x: self.view.bounds.width * 0.25, y: self.view.bounds.height * 0.5, width: 250, height: 290))
container.backgroundColor = .clear
self.view.addSubview(container)
//Purple view
let viewContainer = UIView(frame: CGRect(x: container.bounds.midX , y: 0, width: container.bounds.width * 0.89, height: container.bounds.height))
viewContainer.layer.anchorPoint.x = 1.0
viewContainer.backgroundColor = UIColor(displayP3Red: 158/255, green: 131/255, blue: 178/255, alpha: 1.0)
viewContainer.layer.cornerRadius = 8
viewContainer.clipsToBounds = true
container.addSubview(viewContainer)
//Gray view
let viewContainer2 = UIView(frame: CGRect(x: container.bounds.midX , y: container.bounds.midY, width: container.bounds.width * 0.93, height: container.bounds.height * 0.86))
viewContainer2.layer.anchorPoint.y = 1.0
viewContainer2.layer.anchorPoint.x = 1.0
viewContainer2.backgroundColor = UIColor(white: 0.5, alpha: 0.3)
viewContainer2.layer.cornerRadius = 5
viewContainer2.clipsToBounds = true
container.addSubview(viewContainer2)
//image
let imageView = UIImageView(frame: CGRect(x: container.bounds.midX, y: container.bounds.midY, width: container.bounds.width * 0.90, height: container.bounds.height * 0.90))
imageView.contentMode = .scaleToFill
imageView.layer.anchorPoint = CGPoint(x: 1.0, y: 1.0)
imageView.layer.cornerRadius = 10
imageView.clipsToBounds = true
imageView.image = UIImage(named: "image name")
container.addSubview(imageView)
}
}
I want to draw some items but leave a true alpha transparency cutout for a circular area. What I want to achieve:
Yellow is example background to show bleed through.
The cutout width is actually wider than the arc stroke, so they don't fully intersect. I need true cutout because I a saving to an image with transparency.
I thought maybe I could use setBlendMode() but I believe that would only work if I wanted my cutout to be exactly the same width as the arc. But there is the gist of how I was trying to go about it:
A Swift workbook follows. Any tips on achieving this are greatly appreciated.
import Foundation
import UIKit
var dimen: CGFloat = 200.0;
var strokeWidth: CGFloat = 20.0;
var cutoutWidth: CGFloat = 30.0;
class DonutView : UIView
{
override func draw(_ rect: CGRect)
{
// cutout
let cutoutColor = UIColor(red: 1, green: 0, blue: 0, alpha: 1)
cutoutColor.setFill()
let cutoutPath = UIBezierPath(ovalIn: CGRect(x: dimen-cutoutWidth, y: dimen/2-cutoutWidth/2, width: cutoutWidth, height: cutoutWidth))
cutoutPath.fill()
// let context = UIGraphicsGetCurrentContext()!
// context.setBlendMode(.sourceOut)
let ringOffset = cutoutWidth/2;
let circleWidth = dimen - ringOffset*2;
// ring
let ringPath = UIBezierPath(ovalIn: CGRect(x: ringOffset, y: ringOffset, width: circleWidth, height: circleWidth))
let ringColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.3)
ringColor.setStroke()
ringPath.lineWidth = strokeWidth
ringPath.stroke()
// arc
let arcRect = CGRect(x: ringOffset, y: ringOffset, width: circleWidth, height: circleWidth)
let arcPath = UIBezierPath()
arcPath.addArc(withCenter: CGPoint(x: arcRect.midX, y: arcRect.midY), radius: arcRect.width / 2, startAngle: -90 * CGFloat.pi/180, endAngle: 37 * CGFloat.pi/180, clockwise: true)
let arcColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.6)
arcColor.setStroke()
arcPath.lineWidth = strokeWidth
arcPath.stroke()
}
}
var view = DonutView(frame: CGRect.init(x: 0, y: 0, width: dimen, height: dimen))
view.backgroundColor = UIColor.yellow
// View these elements
view
(Edit: I should have stated this initially: this is to ultimately create a UIImage for WatchKit)
With help from How to clear circle in CGContext in iOS
import Foundation
import UIKit
import PlaygroundSupport
var dimen: CGFloat = 200.0;
var strokeWidth: CGFloat = 20.0;
var cutoutWidth: CGFloat = 30.0;
class DonutView : UIImageView
{
override init(frame: CGRect) {
super.init(frame: frame)
UIGraphicsBeginImageContextWithOptions(CGSize(width: dimen, height: dimen), false, 1)
let context = UIGraphicsGetCurrentContext()!
let ringOffset = cutoutWidth/2;
let circleWidth = dimen - ringOffset*2;
// ring
let ringPath = UIBezierPath(ovalIn: CGRect(x: ringOffset, y: ringOffset, width: circleWidth, height: circleWidth))
let ringColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.3)
ringColor.setStroke()
ringPath.lineWidth = strokeWidth
ringPath.stroke()
// arc
let arcRect = CGRect(x: ringOffset, y: ringOffset, width: circleWidth, height: circleWidth)
let arcPath = UIBezierPath()
arcPath.addArc(withCenter: CGPoint(x: arcRect.midX, y: arcRect.midY), radius: arcRect.width / 2, startAngle: -90 * CGFloat.pi/180, endAngle: 37 * CGFloat.pi/180, clockwise: true)
let arcColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.6)
arcColor.setStroke()
arcPath.lineWidth = strokeWidth
arcPath.stroke()
// Cutout circle
context.setFillColor(UIColor.clear.cgColor)
context.setBlendMode(.clear)
context.addEllipse(in: CGRect(x: dimen-cutoutWidth, y: dimen/2-cutoutWidth/2, width: cutoutWidth, height: cutoutWidth))
context.drawPath(using: .fill)
context.setBlendMode(.normal)
image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
var view = DonutView(frame: CGRect.init(x: 0, y: 0, width: dimen, height: dimen))
view.backgroundColor = UIColor.yellow
// View these elements
view
You can do this by using another CAShapeLayer as a mask.
The portion(s) of the mask layer that are alpha = 1.0 will be fully transparent.
So...
If we make the Arc Layer a sublayer of the Ring Layer, we can then apply the Cutout Layer as a mask, resulting in:
Here is source for a Playground page:
class MyDonutView : UIView
{
let ringLayer = CAShapeLayer()
let arcLayer = CAShapeLayer()
let cutoutLayer = CAShapeLayer()
var strokeWidth: CGFloat = 20.0;
var cutoutWidth: CGFloat = 30.0;
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
func commonInit() -> Void {
// add arcLayer as a sublayer of ringLayer
ringLayer.addSublayer(arcLayer)
// add ringLayer as a sublayer of self.layer
layer.addSublayer(ringLayer)
// ring layer stroke is black at 0.3 alpha, fill is clear
ringLayer.strokeColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.3).cgColor
ringLayer.fillColor = UIColor.clear.cgColor
ringLayer.lineWidth = strokeWidth
// arc layer stroke is black at 0.6 alpha, fill is clear
arcLayer.strokeColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.6).cgColor
arcLayer.lineWidth = strokeWidth
arcLayer.fillColor = UIColor.clear.cgColor
// cutout layer stroke is black (although we're using Zero line width
// fill is black
cutoutLayer.strokeColor = UIColor.red.cgColor
cutoutLayer.lineWidth = 0
cutoutLayer.fillColor = UIColor.red.cgColor
}
override func layoutSubviews() {
super.layoutSubviews()
// define the "padding" around the ring
let ringOffset = cutoutWidth / 2.0
// define the diameter of the ring
let circleWidth = bounds.size.width - cutoutWidth;
// ring path
let ringPath = UIBezierPath(ovalIn: CGRect(x: ringOffset, y: ringOffset, width: circleWidth, height: circleWidth))
// arc path
let arcRect = CGRect(x: ringOffset, y: ringOffset, width: circleWidth, height: circleWidth)
let arcPath = UIBezierPath()
arcPath.addArc(withCenter: CGPoint(x: arcRect.midX, y: arcRect.midY), radius: arcRect.width / 2, startAngle: -90 * CGFloat.pi/180, endAngle: 37 * CGFloat.pi/180, clockwise: true)
// set ring layer path
ringLayer.path = ringPath.cgPath
// set arc layer path
arcLayer.path = arcPath.cgPath
// create a rect path the full size of bounds of self
let fullPath = UIBezierPath(rect: bounds)
// create a cutout path (the small circle to cut-out of the ring/arc)
let cutoutPath = UIBezierPath(ovalIn: CGRect(x: bounds.size.width-cutoutWidth, y: bounds.size.width/2-cutoutWidth/2, width: cutoutWidth, height: cutoutWidth))
// append the cutout path to the full rect path
fullPath.append(cutoutPath)
// even-odd winding rule
cutoutLayer.fillRule = CAShapeLayerFillRule.evenOdd
// set cutout layer path
cutoutLayer.path = fullPath.cgPath
// use cutout layer to mask ring layer
ringLayer.mask = cutoutLayer
}
}
class TestViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
// instantiate a MyDonutView
let myDonutView = MyDonutView()
// we can set the stroke and cutout widths here
myDonutView.strokeWidth = 20.0
myDonutView.cutoutWidth = 30.0
// we're using auto-layout
myDonutView.translatesAutoresizingMaskIntoConstraints = false
// background color yellow to see the frame
//myDonutView.backgroundColor = .yellow
// otherwise, it should be clear
myDonutView.backgroundColor = .clear
// add as subview
view.addSubview(myDonutView)
// constrain centerX and centerY
// width = 200, height = width
NSLayoutConstraint.activate([
myDonutView.widthAnchor.constraint(equalToConstant: 200.0),
myDonutView.heightAnchor.constraint(equalTo: myDonutView.widthAnchor),
myDonutView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
myDonutView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
])
}
}
let vc = TestViewController()
PlaygroundPage.current.liveView = vc
I have a UIImageView, with 2 sublayers, representing 2 different images.
Is there a way to determine which layer was pressed?
Current code
let point = sender.location(in: flagImageView) // Where you pressed
guard let sublayers = flagImageView.layer.sublayers else { return }
if let layer = sublayers.first(where: {$0.name == "Upper_Image"})?.hitTest(point) {
print("Found it: \(layer)")
}
This is the method to add the images
let distance: CGFloat = 4
let downMaskPath = UIBezierPath()
downMaskPath.move(to: CGPoint(x: 0, y: 0))
downMaskPath.addLine(to: CGPoint(x: self.frame.width - distance, y: 0))
downMaskPath.addLine(to: CGPoint(x: 0, y: self.frame.height))
downMaskPath.close()
let upperMaskPath = UIBezierPath()
upperMaskPath.move(to: CGPoint(x: self.frame.width, y: 0))
upperMaskPath.addLine(to: CGPoint(x: self.frame.width, y: self.frame.height))
upperMaskPath.addLine(to: CGPoint(x: distance, y: self.frame.height))
upperMaskPath.close()
upperMaskPath.stroke()
let imageLayer1 = CALayer()
imageLayer1.borderColor = #colorLiteral(red: 0.07843137255, green: 0.1294117647, blue: 0.7176470588, alpha: 1).cgColor
imageLayer1.borderWidth = 1
imageLayer1.contents = image1?.cgImage // Assign your image
imageLayer1.frame = self.frame // Define a frame
let imageLayer2 = CALayer()
imageLayer2.borderColor = #colorLiteral(red: 0, green: 0.4431372549, blue: 1, alpha: 1).cgColor
imageLayer2.borderWidth = 1
imageLayer2.contents = image2?.cgImage // Assign your image
imageLayer2.frame = self.frame // Define a frame
let maskLayer1 = CAShapeLayer()
maskLayer1.path = downMaskPath.cgPath
imageLayer1.mask = maskLayer1
let maskLayer2 = CAShapeLayer()
maskLayer2.path = upperMaskPath.cgPath
imageLayer2.mask = maskLayer2
self.layer.addSublayer(imageLayer1)
self.layer.addSublayer(imageLayer2)
You can use the name property for CALayer, to uniquely identify the among various layers.
Like so :
imageLayer1.name = "someName"
As per Apple
/* The name of the layer. Used by some layout managers. Defaults to nil. */
/** Miscellaneous properties. **/
open var name: String?
Hello i try to render two labels in one CGContext to get an UIImage - one above the other. However the code is ignoring the origins of the CGRects. Can anyone point me in the right direction?
// frames with positions and bounds
let frame = CGRect(x: 0, y: 0, width: 64, height: 64)
let upperFrame = CGRect(x: 0, y: 0, width: 64, height: 40)
let lowerFrame = CGRect(x: 0, y: 40, width: 64, height: 24)
// settings of lower label
let lowerLabel = UILabel(frame: lowerFrame)
lowerLabel.textAlignment = .center
lowerLabel.backgroundColor = UIColor.init(red: 1.0, green: 1.0, blue: 1.0, alpha: 0.0)
lowerLabel.textColor = .black
lowerLabel.font = nameLabel.font.withSize(15.0)
lowerLabel.adjustsFontSizeToFitWidth = true
lowerLabel.minimumScaleFactor = 1.0/nameLabel.font.pointSize
lowerLabel.text = "Monatsende"
// settings of upper label
let upperLabel = UILabel(frame: upperFrame)
upperLabel.textAlignment = .center
upperLabel.backgroundColor = UIColor.init(red: 1.0, green: 1.0, blue: 1.0, alpha: 0.0)
upperLabel.textColor = .black
upperLabel.font = upperLabel.font.withSize(15.0)
upperLabel.adjustsFontSizeToFitWidth = true
upperLabel.minimumScaleFactor = 1.0/upperLabel.font.pointSize
upperLabel.text = "2500 €"
// draw alltogether
UIGraphicsBeginImageContext(frame.size)
if let currentContext = UIGraphicsGetCurrentContext() {
lowerlabel.layer.render(in: currentContext)
upperLabel.layer.render(in: currentContext)
let image = UIGraphicsGetImageFromCurrentImageContext()
return image
}
the result is, that both labels are overlapping each other:
as i understand it the two labels should be clearly distinguishable from one another.
I'm able to add a custom status bar (with gradient) to the UIView like this:
override func viewDidLoad() {
super.viewDidLoad()
var statusBar : UIView = UIView(frame: CGRect(x: 0, y: 0, width: 375, height: 20))
let statusBarGradient : CAGradientLayer = CAGradientLayer()
statusBarGradient.frame = statusBar.bounds
let cor1 = UIColor(red: 0.416, green: 0.604, blue: 0.796, alpha: 1.0)
let cor2 = UIColor.whiteColor()
let arrayColors = [cor1.CGColor, cor2.CGColor]
statusBarGradient.colors = arrayColors
view.layer.insertSublayer(statusBarGradient, atIndex:0)
}
I would also like to add the same gradient to the footer but I'm not having much luck.
Your code works if you add the statusBar as a subview of the view, but I would make it dynamically size the width to fit the width of the superview, so just do the same thing for the footer, but dynamically set the height to be whatever the height of your view is minus the desired height of your footer bar.
let statusBar = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 20))
let footer = UIView(frame: CGRect(x: 0, y: view.frame.height - 20.0, width: view.frame.width, height: 20))
let statusBarGradient = CAGradientLayer()
let footerGradient = CAGradientLayer()
statusBarGradient.frame = statusBar.bounds
let cor1 = UIColor(red: 0.416, green: 0.604, blue: 0.796, alpha: 1.0)
let cor2 = UIColor.blackColor()
let arrayColors = [cor1.CGColor, cor2.CGColor]
footerGradient.frame = footer.bounds
let arrayColorsFooter = [cor2.CGColor, cor1.CGColor]
statusBarGradient.colors = arrayColors
footerGradient.colors = arrayColorsFooter
statusBar.layer.insertSublayer(statusBarGradient, atIndex:0)
footer.layer.insertSublayer(footerGradient, atIndex:0)
view.addSubview(statusBar)
view.addSubview(footer)