Detailed explanation of pause and continue playing of animation in IOS

Detailed explanation of pause and continue playing of animation in IOS

When using the animation control UI, you may encounter pausing the in-progress animation through gestures or other means before continuing. If the finger is pressed, pause the animation and continue the animation when the finger leaves.

The implementation principle is mainly to perform related control through the UI layer.

Pause animation:

- (void)pauselayer:(CALayer *)layer 
{ 
  CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil]; 
   = 0.0; 
   = pausedTime; 
} 

Continue the animation:

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

Example of usage:

// pause[self pauselayer:self.]; 
// continue[self playlayer:self.]; 

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