cagradientlayer

Imagine a CAGradientLayer . It's very easy to animate .startPoint and .endPoint . Now imagine a float spinLike which simply sets both of them at once . {So, instead of having two different animations, you could simply animate spinLike .} So something like .. class CustomGradientLayer: CAGradientLayer { @objc var spinLike: CGFloat = 0 { didSet { startPoint = CGPoint( ... ) endPoint = CGPoint( ... ) setNeedsDisplay() } } } To animate spinLike ... class Test: UIView { ... g = CustomGradientLayer() a = CABasicAnimation(keyPath: "spinLike") ... g.add(a, forKey: nil) ... But. It doesn't work,

I'm adding a CAGradientLayer to a view. When the view is auto-resized (such as after a rotation) the gradient layer is not resized. Can the gradient be set to auto-resize the same as the view? Note also that I am using auto-layout constraints in the view. Here's what I'm doing: CAGradientLayer *gradientLayer = [CAGradientLayer layer]; gradientLayer.frame = CGRectMake(0.0, 0.0, frame.size.width, frame.size.height); gradientLayer.colors = [NSArray arrayWithObjects: (id)[[UIColor colorWithRed:255.0/255.0f green:255.0/255.0f blue:255.0/255.0f alpha:1.0f] CGColor], (id)[[UIColor colorWithRed:233.0

i have just a problem with my MKPolyLineView. I simply try to make a color gradient to the Polyline, but with CAGradient it doenst work. I subclasses MKPolylineView and redrawing in - (void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context UIColor *darker = [UIColor blackColor]; CGFloat baseWidth = self.lineWidth / zoomScale; // draw the dark colour thicker CGContextAddPath(context, self.path); CGContextSetStrokeColorWithColor(context, darker.CGColor); CGContextSetLineWidth(context, baseWidth * 1.5); CGContextSetLineCap(context, self.lineCap);

Given an arbitrary UIView on iOS, is there a way using Core Graphics (CAGradientLayer comes to mind) to apply a "foreground-transparent" gradient to it? I can't use a standard CAGradientLayer because the background is more complex than a UIColor. I also can't overlay a PNG because the background will change as my subview is scrolled along its parent vertical scrollview (see image). I have a non-elegant fallback: have my uiview clip its subviews and move a pre-rendered gradient png of the background as the parent scrollview is scrolled. jpsim This was an embarrassingly easy fix: apply a

What you will see in the first image, if you scroll down a little bit, is the initial screen of a fin app. Basically, every section you see on the screen is placed within a vertical Stack View. Then every Label and Cell Is placed in a horizontal Stack View and so on, so the app auto-resizes for any screen size. I was using Story Board to create the elements. The last section has two blue UITextFields that have a gradient layer behind it. I created an extension UITextField Class in a separate file that has the gradient function constructor in it and then another Class that placed the gradient

I have a view, which has a CALayer. When I create a CAGradientLayer and apply it as the mask of that view's CALayer, nothing happens. Why? In -initWithFrame: of the view I do this: CAGradientLayer *gradient = [CAGradientLayer layer]; gradient.frame = self.bounds; gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor blackColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil]; //[self.layer insertSublayer:gradient atIndex:0]; self.layer.mask = gradient; If I replace self.layer.mask = gradient; with [self.layer insertSublayer:gradient atIndex:0]; then I see the gradient. It's from black

Right now I've got a GA Gradient layer where I've set the colors but I'd like to set the color point to (instead of top center, to top left) and the bottom to (instead of bottom center to bottom right) just to change things up a bit. Thoughts? Below is the code that I've got so far...I included core animation because I'm animation between colors. - (id)init { self = [super init]; UIView *gradientView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.w, self.h)]; [self addSubview:gradientView]; [self sendSubviewToBack:gradientView]; topColor = [UIColor colorWithRed:0.012 green:0.012 blue:0

I use the following CAGradientLayer: let layer = CAGradientLayer() layer.colors = [ UIColor.redColor().CGColor, UIColor.greenColor().CGColor, UIColor.blueColor().CGColor ] layer.startPoint = CGPointMake(0, 1) layer.endPoint = CGPointMake(1, 0) layer.locations = [0.0, 0.6, 1.0] But when I set bounds property for the layer, it just stretches a square gradient. I need a result like in Sketch 3 app image (see above). How can I achieve this? Senseful Update: Use context.drawLinearGradient() instead of CAGradientLayer in a manner similar to the following . It will draw gradients that are consistent