UIButton点击放大缩小动画

   UIButton *button = _dialing_Btn;
   button.transform = CGAffineTransformIdentity;
   [UIView animateKeyframesWithDuration:0.5 delay:0 options:0 animations: ^{
       [UIView addKeyframeWithRelativeStartTime:0 relativeDuration:1 / 3.0 animations: ^{
           
           button.transform = CGAffineTransformMakeScale(1.5, 1.5);
       }];
       [UIView addKeyframeWithRelativeStartTime:1/3.0 relativeDuration:1/3.0 animations: ^{
           
           button.transform = CGAffineTransformMakeScale(0.8, 0.8);
       }];
       [UIView addKeyframeWithRelativeStartTime:2/3.0 relativeDuration:1/3.0 animations: ^{
           
           button.transform = CGAffineTransformMakeScale(1.0, 1.0);
       }];
   } completion:nil];