touchesBegan: withEvent: 不执行解决

touchesBegan: withEvent: / touchesMoved: withEvent: / touchesEnded: withEvent: 等只能被UIView捕获（如有问题请指出对请指出，路过的大牛请勿喷），当我们创建

UIScrollView 或 UIImageView 时，当点击时UIScrollView 或 UIImageView 会截获touch事件，导致touchesBegan: withEvent:/touchesMoved: withEvent:/touchesEnded: withEvent: 等方法不执行。解决办法：当UIScrollView 或 UIImageView 截获touch事件后，让其传递下去即可（就是传递给其父视图UIView）

可以通过写UIScrollView 或 UIImageView 的category 重写touchesBegan: withEvent: / touchesMoved: withEvent: / touchesEnded: withEvent: 等来实现

// // UIScrollView+UITouch.m //  // // Created by MLS on 15/11/20. // Copyright © 2015年 mls. All rights reserved. //  #import "UIScrollView+UITouch.h"  @implementation UIScrollView (UITouch)  - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {   // 选其一即可   [super touchesBegan:touches withEvent:event]; //  [[self nextResponder] touchesBegan:touches withEvent:event]; }  @end