core-animation

Is there an issue with reading the presentation position while it's paused? I'm trying to pause and resume a CALayer . Once the CALayer is paused, I want to update the layer's position with it's current presentation position. When I try do this, the layer flickers slightly once I resume the layer. This is the code I'm using to pause and resume the CALayer (based on a Technical Q&A QA1673 supplied by Apple): CFTimeInterval pausedTime; void pauseLayer(CALayer *layer) { pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil]; layer.speed = 0.0; layer.timeOffset = pausedTime; layer

I have the following block-based animation: [UIView animateWithDuration:0.5f delay:0.0f options:UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse|UIViewAnimationOptionAllowUserInteraction|UIViewAnimationOptionCurveEaseInOut animations:^{ [view.layer setTransform:CATransform3DMakeScale(1.3f, 1.3f, 1.0f)]; NSLog(@"animating"); }completion:^(BOOL finished){ NSLog(@"Completed"); }]; When the app returns from being in the background, the completion block is called, and my animations don't restart. I've tried to use the following delegate method to restart the animations: - (void

In Mac OS X Lion CARemoteLayerServer and CARemoteLayerClient were added to QuartzCore. I've been trying to investigate if they'd be suitable for splitting a graphical application between multiple processes, but without success. I can use them successfully within a single process, with some code along the lines of this: - (void)buildLayerSingleProcess { CARemoteLayerServer *server = [CARemoteLayerServer sharedServer]; self.client = [[CARemoteLayerClient alloc] initWithServerPort: server.serverPort]; uint32_t clientID = self.client.clientId; CALayer *layer1 = [CALayer layer]; layer1.bounds =

I am trying to change the corner radius of a button (OpenNoteVisible.layer) in the following way: CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"cornerRadius"]; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; animation.fromValue = [NSNumber numberWithFloat:10.0f]; animation.toValue = [NSNumber numberWithFloat:0.0f]; animation.duration = 1.0; [animation.layer setCornerRadius:140.0]; [OpenNoteVisible.layer addAnimation:animation forKey:@"cornerRadius"]; But this code gives an error at the line [animation.layer

I am trying to animate a custom property on a CALayer with an implicit animation: [UIView animateWithDuration:2.0f animations:^{ self.imageView.myLayer.myProperty = 1; }]; In -actionForKey: method I need to return the animation taking care of interpolating the values. Of course I have to tell somehow the animation how to retrieve the other parameters for the animation (i.e. the duration and the timing function ). - (id<CAAction>)actionForKey:(NSString *)event { if ([event isEqualToString:@"myProperty"]) { CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"myProperty"]; [anim

I'm animating a pendulum which swings from 0 degrees to max 200 degrees and then back again. The problem is that if the pendulum goes over 180 degrees, it returns to 0 by the shortest route which is to continue clockwise. And I'd like it to go anticlockwise. Here's my code: ('right' is a boolean which is TRUE when the pendulum is swinging from left to right) - (void)swingPendulum { CABasicAnimation *rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; if (right) rotationAnimation.toValue = [NSNumber numberWithFloat:degreesToRadians(kMax)];