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
self.view.layer.shouldRasterize = YES; self.view.layer.rasterizationScale = UIScreen.mainScreen.scale; I was recently having some issues with slow CALayer shadows, and that simple line of code fixed up everything for me!
Have you set the removedOnCompletion property of the rotation animation to NO, e.g., rota.removedOnCompletion = NO; That should leave the presentation layer where it was when the animation finished. The default is YES, which will snap back to the model value, i.e., the behavior you describe. The fillMode should also be set, i.e., rota.fillMode = … Read more
I’m curious why none of these answers mention the zPosition attribute on CALayer. Core Animation looks at this attribute to figure out layer rendering order. The higher the value, the closer it is to the front. These answers all work as long as your zPosition is 0, but to easily bring a layer to the … 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
Sounds like you want to render your layer into a UIImage. In that case, the method below should do the trick. Just add this to your view or controller class, or create a category on CALayer. Obj-C – (UIImage *)imageFromLayer:(CALayer *)layer { UIGraphicsBeginImageContextWithOptions(layer.frame.size, NO, 0); [layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return outputImage; } … Read more
Basics There are a number of different transforms you can do on a layer, but the basic ones are translate (move) scale rotate To do transforms on a CALayer, you set the layer’s transform property to a CATransform3D type. For example, to translate a layer, you would do something like this: myLayer.transform = CATransform3DMakeTranslation(20, 30, … Read more
For labels, or views with rounded corners and or background colors and shadows on scrolling views the solution is pretty simple: The biggest issue is from the masksToBounds layer option. This appears to tax performance significantly, however the label seems to need this ON to mask the background color to rounded corners. So to get … Read more
(Decided to take this out of comments and put it as an answer, since I think it’s a darned good answer 🙂 Ha! I had an NaN calculation (div0), too. Key debugging aid: the message in question is output by NSLog(), so set a breakpoint on NSLog() and watch what the OS is doing at … Read more
Keep a reference to the sublayer added Remove the sublayer from the super layer when not needed. The code would be like: Obj C: [thesublayer removeFromSuperlayer] Swift: thesublayer.removeFromSuperlayer() //thesublayer is the name of the layer you want to remove