How to animate a png sequence with core animation in cocoa (not touch)
calayer, cocoa, core-animation
Solution
tl;dr:
Make your view layer-hosting by calling
[iconV setLayer:[CALayer layer]];
[iconV setWantsLayer:YES];
Why nothing happens
The reason nothing is happening is that your image view doesn't have a layer so when you call `[iconV.layer addSublayer:layer];` you are sending a message to `nil` and nothing happens (the sublayer is not added to the image view).
Views on OS X don't use Core Animation layers as their backing store by default for backwards compatibility. A view with a layer can either be layer-backed or layer-hosting.
You should not interact directly with a layer-backed view and you shouldn't add views (but adding layers is ok) to a layer-hosting view. Since you are adding the layer to your image views layer (and thus interacting directly with it) you want a layer-hosting view.
Fixing it
You can tell your view that it should be layer-hosting by first giving it the layer using `[iconV setLayer:[CALayer layer]];` and then (order is important) telling it that it wants a layer using `[iconV setWantsLayer:YES];`.
For more information on layer-backed and layer-hosting views please read the documentation for `wantsLayer`.
Problem
I would like to animate a png sequence in a NSImageView, but I cannot make it work. It just does not want to show any animation. Any suggestion? This is my code: ``` - (void) imageAnimation { NSMutableArray *iconImages = [[NSMutableArray alloc] init]; for (int i=0; i<=159; i++) { NSString *imagePath = [NSString stringWithFormat:@"%@_%05d",@"clear",i]; [iconImages addObject:(id)[NSImage imageNamed:imagePath]]; //NSImage *iconImage = [NSImage imageNamed:imagePath]; //[iconImages addObject:(__bridge id)CGImageCreateWithNSImage(iconImage)]; } CALayer *layer = [CALayer layer]; CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"]; [animation setCalculationMode:kCAAnimationDiscrete]; [animation setDuration:10.0f]; [animation setRepeatCount:HUGE_VALF]; [animation setValues:iconImages]; [layer setFrame:NSMakeRect(0, 0, 104, 104)]; layer.bounds = NSMakeRect(0, 0, 104, 104); [layer addAnimation:animation forKey:@"contents"]; //Add to the NSImageView layer [iconV.layer addSublayer:layer]; } ```