After playing with it for a little while in the playground I noticed that each arc adds two segments to the bezier path, not just one. Moreover, calling closePath adds two more. So to keep the number of segments consistent, I ended up with adding fake segments to my square path. The code is in … Read more
Here’s the answer, it’s a combination of my answer and Krishnan’s. cabasicanimation.fillMode = kCAFillModeForwards; cabasicanimation.removedOnCompletion = NO; The default value is kCAFillModeRemoved. (Which is the reset behavior you’re seeing.)
I managed to get the affect of compositing multiple CALayers by drawing them directly into a UIView’s graphics context. -(void)drawRect:(CGRect)rect { CGContextRef c = UIGraphicsGetCurrentContext(); CGContextSetBlendMode(c, kCGBlendModeDifference); [myLayer drawInContext:c]; } BTW, I did not add the layers as sublayers of the view’s layer (that is I never called [myView.layer addSublayer:myLayer])
I am not an expert on CoreAnimation but you can define a CABasicAnimation as follows CABasicAnimation *morph = [CABasicAnimation animationWithKeyPath:@”path”]; morph.duration = 5; morph.toValue = (id) [self getTrianglePath]; [maskLayer addAnimation:morph forKey:nil]; The first line states that you want to define an animation that changes the path property of the layer. The second line states that … Read more
From what I understood, you just need a layer that draws a gradient, and CGContextDrawRadialGradient works perfectly for that need. And to reiterate on what you said, CAGradientLayer doesn’t support radial gradients, and nothing we can do about that, except unnecessary swizzling that can be done cleanly with a CALayer subclass. (note: the gradient drawing … Read more
According to the Apple specification: It is composited above the receiver’s contents and sublayers. So, the border will always be above of all your subviews, even if you bring your subview to the front and so on. So I make a background view to fake the border. E.g.: UIView *backgroundView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, … Read more
They are different names because UIView and CALayer are different and have different terminology associated with them, but they are functionally equivalent. If you disassemble clipsToBounds you will see it just calls masksToBounds (disassembly from the simulator framework, so x86): -(BOOL)[UIView(Rendering) clipsToBounds] +0 3091938a 55 pushl %ebp +1 3091938b 89e5 movl %esp,%ebp +3 3091938d e800000000 … Read more
Check UIBezierPath setLineDash:count:phase: method: – (void)setLineDash:(const CGFloat *)pattern count:(NSInteger)count phase:(CGFloat)phase` method. This allows you to draw dashed lines. First add a CAShapeLayer. Add it as sublayer to your UIView. It has a path property. Now make an object of UIBezierPath. Draw the line using setLineDash. For example: UIBezierPath *path = [UIBezierPath bezierPath]; //draw a line … Read more
Fortunately it’s now very easy today (2020) These days it’s very easy to do this: Here’s the whole thing import UIKit class GlowBox: UIView { override func layoutSubviews() { super.layoutSubviews() backgroundColor = .clear layer.shadowOpacity = 1 layer.shadowColor = UIColor.red.cgColor layer.shadowOffset = CGSize(width: 0, height: 0) layer.shadowRadius = 3 let p = UIBezierPath( roundedRect: bounds.insetBy(dx: 0, … Read more
This is a general answer for the sake of future viewers. It is based on the question title rather than the details of the original question. How to add a UIImage to a CALayer You can add an image to a view’s layer simply by using its contents property: myView.layer.contents = UIImage(named: “star”)?.cgImage Note that … Read more