UIScrollView代理方法总结

https://www.jianshu.com/p/aa0491421c37

https://www.jianshu.com/p/498feb7e2425

UIScrollView 与 touchesBegan 冲突解决方法 - 玩也是种气质 - 博客园

1 . 告诉代理要缩放那个控件。

- (nullableUIView*)viewForZoomingInScrollView:(UIScrollView*)scrollView;

2. 缩放完毕的时候调用

- (void)scrollViewDidEndZooming:(UIScrollView*)scrollView withView:(nullableUIView*)view atScale:(CGFloat)scale;

3.