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