touchesBegan: withEvent: / touchesMoved: withEvent: / touchesEnded: withEvent: 等只能被UIView捕獲（如有問題請指出對請指出，路過的大牛請勿噴），當我們創建

UIScrollView 或 UIImageView 時，當點擊時UIScrollView 或 UIImageView 會截獲touch事件，導致touchesBegan: withEvent:/touchesMoved: withEvent:/touchesEnded: withEvent: 等方法不執行。解決辦法：當UIScrollView 或 UIImageView 截獲touch事件後，讓其傳遞下去即可（就是傳遞給其父視圖UIView）

可以通過寫UIScrollView 或 UIImageView 的category 重寫touchesBegan: withEvent: / touchesMoved: withEvent: / touchesEnded: withEvent: 等來實現

// 
// 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 
{ 
  // 選其一即可 
  [super touchesBegan:touches withEvent:event]; 
//  [[self nextResponder] touchesBegan:touches withEvent:event]; 
} 
 
@end