IOS 之关键帧动画-CAKeyframeAnimation

//长按左右晃动的幅度大小    CGFloat shake = 10;        CAKeyframeAnimation *keyAnim = [CAKeyframeAnimation animation];    keyAnim.keyPath = @"transform.translation.x";    keyAnim.values = @[@(-shake), @(shake), @(-shake)];    keyAnim.removedOnCompletion = NO;    keyAnim.repeatCount = MAXFLOAT;    //左右晃动一次的时间    keyAnim.duration = 0.3;    [self.layer addAnimation:keyAnim forKey:@"shake"];