Is there a way to pause a CABasicAnimation?

Question

I have a basic spinning animation of the iPhone. Is there any way that I can "pause" the animation so that the position of the view will be maintained? I guess one way of doing this would be to cause the animation to "complete" instead of calling "remove" on it, how would I do that?

CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2]; rotationAnimation.duration = 100; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = HUGE_VALF; rotationAnimation.removedOnCompletion = NO; rotationAnimation.fillMode = kCAFillModeForwards; [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"]; 

Answer 1

Recently appeared Apple's technical note QA1673 describes how to pause/resume layer's animation.

Pause and resume animations listing is below:

-(void)pauseLayer:(CALayer*)layer {     CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];     layer.speed = 0.0;     layer.timeOffset = pausedTime; }  -(void)resumeLayer:(CALayer*)layer {     CFTimeInterval pausedTime = [layer timeOffset];     layer.speed = 1.0;     layer.timeOffset = 0.0;     layer.beginTime = 0.0;     CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;     layer.beginTime = timeSincePause; } 

Edit: iOS 10 introduced new API - UIViewPropertyAnimator that allows to handle animations more interactively, for example it makes easy to pause and resume animation or 'seek' it to some particular progress value.

Answer 2

Answer For Swift 3:

Credits @Vladimir

Code:

 func pauseAnimation(){   let pausedTime = layer.convertTime(CACurrentMediaTime(), fromLayer: nil)   layer.speed = 0.0   layer.timeOffset = pausedTime }  func resumeAnimation(){   let pausedTime = layer.timeOffset   layer.speed = 1.0   layer.timeOffset = 0.0   layer.beginTime = 0.0   let timeSincePause = layer.convertTime(CACurrentMediaTime(), fromLayer: nil) - pausedTime   layer.beginTime = timeSincePause }