编辑时抖动的动画效果

CAKeyframeAnimation *anima = [CAKeyframeAnimation animation];

    anima.keyPath = @"transform.rotation";

    anima.values = @[@(angleValue(-1)),@(angleValue(1)),@(angleValue(-1))];

    anima.repeatCount=MAXFLOAT;

添加动画

[self.layer addAnimation:anima forKey:@"editDrugAnimation"];

删除动画

 [self.layer removeAnimationForKey:@"editDrugAnimation"];