A subview will always be drawn on “top” of its superview. Depending on your specific requirements, you may need to have a plain UIView as the background/container view, with your existing subviews in there, and then your custom view as another subview added to the very top, so it has the highest Z-order. This would … Read more
I was going to say “What have you tried?”, but it’s Friday afternoon and I got off work early, so I took the opportunity to translate my old ObjC code. Here it is, suitable for Playground. It should be trivial to put it in your UIView. Swift 2 See below for Swift 3 & Swift … Read more
I would clip to the path you want to fill, and use CGContextDrawLinearGradient. Here is a simple implementation of drawRect: as an example: – (void) drawRect:(CGRect)rect { // Create a gradient from white to red CGFloat colors [] = { 1.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 1.0 }; CGColorSpaceRef baseSpace = CGColorSpaceCreateDeviceRGB(); CGGradientRef gradient … Read more
Call [img drawInRect:rect];.
This is a tricky one. UIView‘s clipsToBounds is necessary to get the rounded corners. But CALayer‘s masksToBounds has to be false so the shadow is visible. Somehow, everything works if drawRect is not overridden, but actually it shouldn’t. The solution is to create a superview to provide the shadow (in the demonstration below this is … Read more
The easiest way to do this is to use the power of core animation to do most of the work for you. To do that, we’ll have to move your circle drawing code from your drawRect function to a CAShapeLayer. Then, we can use a CABasicAnimation to animate CAShapeLayer‘s strokeEnd property from 0.0 to 1.0. … Read more