I am creating a CAGradientLayer with the shape of a horseshoe. It seems it's not taking the path and it just draws a square with shadow. What am I missing ?
let gradientLayerContainer = CAShapeLayer()
let gradient = CAGradientLayer()
let segmentGradientPath = UIBezierPath.horseshoe(
center: centerPoint,
innerRadius: (bounds.width / 2) - config.ringWidth,
outerRadius: bounds.width / 2,
startAngle: segmentTapped.startAngle,
endAngle: segmentTapped.endAngle)
gradientLayerContainer.fillColor = UIColor.clear.cgColor
gradientLayerContainer.path = segmentGradientPath.cgPath
let end = centerPoint
let start = centerPoint.shifted(outerRadius, with: segmentTapped.centerAngle)
gradient.startPoint = CGPoint(x: start.x / bounds.width, y: start.y / bounds.height)
gradient.endPoint = CGPoint(x: end.x / bounds.width, y: end.y / bounds.height)
gradient.colors = [UIColor.white.withAlphaComponent(0.0).cgColor, UIColor.white.cgColor]
gradient.frame = segmentGradientPath.bounds
gradient.mask = gradientLayerContainer
gradient.locations = [0, 1]
horseshoeLayer.addSublayer(gradientLayerContainer)
gradientLayerContainer.insertSublayer(gradient, at: 0)
The mask belongs to the gradient layer. The gradient layer does not belong to the mask. Also the mask color needs to be opaque everywhere you want the gradient to show (you are using clear which is the opposite).
Here is a Playground example of the correct hierarchy:
import PlaygroundSupport
import UIKit
let rect = CGRect(x: 0, y: 0, width: 300, height: 300)
let gradient = CAGradientLayer()
let maskLayer = CAShapeLayer()
let maskPath = UIBezierPath(ovalIn: rect)
maskLayer.fillColor = UIColor.black.cgColor
maskLayer.path = maskPath.cgPath
gradient.colors = [UIColor.blue.cgColor, UIColor.red.cgColor]
gradient.mask = maskLayer
gradient.locations = [0, 1]
let view = UIView(frame: rect)
view.layer.addSublayer(gradient)
gradient.frame = view.bounds
PlaygroundPage.current.liveView = view
Related
I want to draw semi circle with gradient, but when i add gradient the semi circle does not look right
what i have done
let center = CGPoint(x: circleView.bounds.size.width / 2, y: circleView.bounds.size.height / 2)
let circleRadius = circleView.bounds.size.width / 2
let circlePath = UIBezierPath(arcCenter: center, radius: circleRadius, startAngle: CGFloat.pi, endAngle: CGFloat.pi * 2, clockwise: true)
let semiCircleLayer = CAShapeLayer()
semiCircleLayer.path = circlePath.cgPath
semiCircleLayer.lineCap = .round
semiCircleLayer.strokeColor = UIColor.white.cgColor
semiCircleLayer.fillColor = UIColor.clear.cgColor
semiCircleLayer.lineWidth = 6
semiCircleLayer.strokeStart = 0
semiCircleLayer.strokeEnd = 1
let gradient = CAGradientLayer()
gradient.colors = [UIColor.red.cgColor, UIColor.yellow.cgColor, UIColor.green.cgColor]
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
gradient.frame = circleView.bounds
gradient.mask = semiCircleLayer
circleView.layer.addSublayer(gradient)
Gradient Semi Circle:
Without Gradient Semi Circle:
Expected Result:
its because you're using full frame of initial circleView and lineWidth > 1
try to change this line
let circleRadius = circleView.bounds.size.width / 2 - 4
I want to set border color with the gradient left to right [Red, Green] at UIView.
Like example:
I tried below code: -
class View: UIView {
override func layoutSubviews() {
super.layoutSubviews()
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.topLeft, .bottomLeft, .topRight, .bottomRight], cornerRadii: CGSize(width: frame.size.height / 2, height: frame.size.height / 2))
let gradient = CAGradientLayer()
gradient.frame = CGRect(origin: CGPoint.zero, size: frame.size)
gradient.colors = [UIColor.green.cgColor, UIColor.red.cgColor]
let shape = CAShapeLayer()
shape.lineWidth = 10
shape.path = path.cgPath
shape.strokeColor = UIColor.black.cgColor
shape.fillColor = UIColor.clear.cgColor
gradient.mask = shape
layer.insertSublayer(gradient, at: 0)
}
}
There is three problem which I am not able to resolve: -
1- I have set lineWidth 10 but its showing width 10 at corners and at horizontal/vertical only 5.
2- I want to show the gradient from left to right not top to bottom.
I tried below code to set gradient from left to right but not working: -
// gradient.frame = CGRect(origin: CGPoint.zero, size: frame.size)
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
Please help. Thanks in advance.
Edit
I want to set border from left to right
You need to change gradient.startPoint and gradient.endPoint
enum Direction {
case horizontal
case vertical
}
class View: UIView {
init(frame: CGRect, cornerRadius: CGFloat, colors: [UIColor], lineWidth: CGFloat = 5, direction: Direction = .horizontal) {
super.init(frame: frame)
self.layer.cornerRadius = cornerRadius
self.layer.masksToBounds = true
let gradient = CAGradientLayer()
gradient.frame = CGRect(origin: CGPoint.zero, size: self.frame.size)
gradient.colors = colors.map({ (color) -> CGColor in
color.cgColor
})
switch direction {
case .horizontal:
gradient.startPoint = CGPoint(x: 0, y: 1)
gradient.endPoint = CGPoint(x: 1, y: 1)
case .vertical:
gradient.startPoint = CGPoint(x: 0, y: 0)
gradient.endPoint = CGPoint(x: 0, y: 1)
}
let shape = CAShapeLayer()
shape.lineWidth = lineWidth
shape.path = UIBezierPath(roundedRect: self.bounds.insetBy(dx: lineWidth,
dy: lineWidth), cornerRadius: cornerRadius).cgPath
shape.strokeColor = UIColor.black.cgColor
shape.fillColor = UIColor.clear.cgColor
gradient.mask = shape
self.layer.addSublayer(gradient)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
As you can see, I added some extra parameters. I solved this issue by adding inset to the roundedRect:
shape.path = UIBezierPath(roundedRect: self.bounds.insetBy(dx: lineWidth,
dy: lineWidth), cornerRadius: cornerRadius).cgPath
How to use it:
let myView = View(frame: CGRect(x: 0, y: 0, width: 200, height: 50), cornerRadius: 25, colors: [UIColor.red, .orange, .yellow], lineWidth: 2, direction: .horizontal)
myView.center = view.center
view.addSubview(myView)
Screenshot:
roundedViewWithGradient
The problem is that the the bezier path is not drawn inside its bounds. It's drawn around its bounds. So half the stroke width is inside and half is outside. You need to adjust the bounds to deal with this.
Change the frame you pass into the bezier path from self.bounds to self.bounds.insetBy(dx: 5, dy: 5) where 5 is half your line width.
And the lines:
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
do result in the gradient going from left to right.
Here is fully working code from yours:
class View: UIView {
override func layoutSubviews() {
super.layoutSubviews()
let path = UIBezierPath(roundedRect: self.bounds.insetBy(dx: 5, dy: 5), byRoundingCorners: [.topLeft, .bottomLeft, .topRight, .bottomRight], cornerRadii: CGSize(width: frame.size.height / 2, height: frame.size.height / 2))
let gradient = CAGradientLayer()
gradient.frame = CGRect(origin: CGPoint.zero, size: frame.size)
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
gradient.colors = [UIColor.green.cgColor, UIColor.red.cgColor]
let shape = CAShapeLayer()
shape.lineWidth = 10
shape.path = path.cgPath
shape.strokeColor = UIColor.black.cgColor
shape.fillColor = UIColor.clear.cgColor
gradient.mask = shape
layer.insertSublayer(gradient, at: 0)
}
}
What I am trying to get is the a custom UIButton that has a gradient border (just the border is gradient) and rounded corners. I almost got to where I wanted to be, but having issues with the corners.
Here is what I currently have:
Here is my code:
override func viewDidLoad() {
super.viewDidLoad()
let gradient = CAGradientLayer()
gradient.frame = CGRect(origin: CGPoint.zero, size: self.myButton.frame.size)
gradient.colors = [UIColor.blue.cgColor, UIColor.green.cgColor]
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
gradient.cornerRadius = 15
let shape = CAShapeLayer()
shape.lineWidth = 5
shape.path = UIBezierPath(rect: self.myButton.bounds).cgPath
shape.strokeColor = UIColor.black.cgColor
shape.fillColor = UIColor.clear.cgColor
shape.cornerRadius = 15
gradient.mask = shape
self.myButton.clipsToBounds = true
self.myButton.layer.cornerRadius = 15
self.myButton.layer.addSublayer(gradient)
}
So the question is how do I display corners with gradient?
The problem is with the mask, try to remove shape.cornerRadius = 15 and change this:
shape.path = UIBezierPath(rect: self.myButton.bounds).cgPath
to this:
shape.path = UIBezierPath(roundedRect: self.myButton.bounds.insetBy(dx: 2.5, dy: 2.5), cornerRadius: 15.0).cgPath
Play with the values of the insets and cornerRadius to achieve your desired result.
Any idea on how to fill all the paths in here. What is currently happening is that I draw a rectangle path on my view then add small circles in between but it seems that if the circle and rectangle intersects, the white fill color is showing. What I would want is show still the gradient layer. Any help? My current code is below.
func addGradientLayer() {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = bounds
let startColor = UIColor.create(withHexOrName: OurPayStatesViewUX.GradientColorStart)
let endColor = UIColor.create(withHexOrName: OurPayStatesViewUX.GradientColorEnd)
gradientLayer.colors = [startColor.CGColor, endColor.CGColor]
gradientLayer.startPoint = CGPoint(x: 0, y: 0)
gradientLayer.endPoint = CGPoint(x: 1, y: 0)
layer.insertSublayer(gradientLayer, atIndex: 0)
}
func createOverlay(view: UIView, circleLocations: [CGPoint]) {
maskLayer?.removeFromSuperlayer()
let radius: CGFloat = view.frame.height/2
let path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: view.bounds.size.width, height: view.bounds.size.height), cornerRadius: 0)
for i in circleLocations {
// Create a circle path in each of the state views
let circlePath = UIBezierPath(roundedRect: CGRect(x: i.x, y: i.y, width: 2 * radius, height: 2 * radius), cornerRadius: radius)
path.appendPath(circlePath)
}
let rect = createRectangle(startPointX: 0, endPointX: view.bounds.size.width)
path.appendPath(rect)
path.usesEvenOddFillRule = true
let fillLayer = CAShapeLayer()
fillLayer.path = path.CGPath
fillLayer.fillRule = kCAFillRuleEvenOdd
fillLayer.fillColor = backgroundColor?.CGColor ?? UIColor.whiteColor().CGColor
fillLayer.opacity = 1
maskLayer = fillLayer
layer.addSublayer(fillLayer)
}
func createRectangle(startPointX startPointX: CGFloat, endPointX: CGFloat) -> UIBezierPath {
let rectHeight: CGFloat = 6
let path = UIBezierPath(rect: CGRect(x: startPointX, y: frame.height/2 - rectHeight/2, width: endPointX - startPointX, height: rectHeight))
return path
}
How to apply gradient color to UIImageView border color. What i tried is
let gradient: CAGradientLayer = CAGradientLayer()
let color0 = UIColor(red:0.0/255, green:0.0/255, blue:0.0/255, alpha:0.0).CGColor
let color1 = UIColor(red:0.0/255, green:0.0/255, blue: 0.0/255, alpha:0.71).CGColor
gradient.colors = [color0, color1]
gradient.locations = [0.0 , 1.0]
gradient.frame = CGRect(x: 0.0, y: 80.0, width: self.imgProfile.frame.size.width, height: self.imgProfile.frame.size.height-35)
self.imgProfile.layer.insertSublayer(gradient, atIndex: 0)
This is what required
Please guide, thanks
Update:
Tried this way
let gradient = CAGradientLayer()
gradient.frame = CGRect(origin: CGPointZero, size: self.imgPeopleProfile.frame.size)
gradient.colors = [UIColor.blueColor().CGColor, UIColor.greenColor().CGColor]
let shape = CAShapeLayer()
shape.lineWidth = 2
shape.path = UIBezierPath(rect: self.imgPeopleProfile.bounds).CGPath
shape.strokeColor = UIColor.blackColor().CGColor
shape.fillColor = UIColor.clearColor().CGColor
gradient.mask = shape
imgPeopleProfile.layer.cornerRadius = imgPeopleProfile.frame.size.width / 2
imgPeopleProfile.clipsToBounds = true
self.imgPeopleProfile.layer.addSublayer(gradient)
It gives
Please take Imageview Size Equal width and height ex. Width=100 and Height = 100 So it will show proper Circle. If you want to change the Size then please amke also change in the below Line .
shape.path = UIBezierPath(arcCenter: CGPoint(x: 50, y: 50), radius: CGFloat(50), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true).CGPath
With the radius of the Circle in above example its 50.
let gradient = CAGradientLayer()
gradient.frame = CGRect(origin: CGPointZero, size: self.imageView.frame.size)
gradient.colors = [UIColor(red:87.0/255, green:206.0/255, blue: 172.0/255, alpha:0.71).CGColor,UIColor(red:44.0/255, green:192.0/255, blue:208.0/255, alpha:1.0).CGColor]
imageView.layer.cornerRadius = imageView.frame.size.width / 2
imageView.clipsToBounds = true
let shape = CAShapeLayer()
shape.lineWidth = 5
shape.path = UIBezierPath(arcCenter: CGPoint(x: 50, y: 50), radius: CGFloat(50), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true).CGPath
shape.strokeColor = UIColor.blackColor().CGColor
shape.fillColor = UIColor.clearColor().CGColor
gradient.mask = shape
self.imageView.layer.addSublayer(gradient)