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