07-心跳效果
思路:就是让一张图片做一个放大缩放小的动画.
代码实现:
CABasicAnimation *anim =[CABasicAnimation animation];
设置缩放属性
anim.keyPath = @"transform.scale";
缩放到最小
anim.toValue = @0;
设置动画执行的次数
anim.repeatCount = MAXFLOAT;
设置动画执行的时长
anim.duration = 0.25;
设置动画自动反转(怎么去, 怎么回)
anim.autoreverses = YES;
添加动画
[self.heartView.layer addAnimation:anim forKey:nil];
![](https://images2015.cnblogs.com/blog/824103/201512/824103-20151217173808756-39607902.png)
![](https://images2015.cnblogs.com/blog/824103/201512/824103-20151217173821365-1125519170.gif)
![](https://images2015.cnblogs.com/blog/824103/201512/824103-20151217173846131-437369137.gif)