問題描述

我正在我的視圖控制器(UIViewController 的自定義子類)中處理幾個 UI 組件的觸摸.它有方法 touchesBegan:withEvent:、touchesMoved:withEvent: 和 touchesEnded:withEvent:.它工作正常.然后我添加了一個滾動視圖(UIScrollView)作為層次結(jié)構(gòu)中的頂視圖.

I am handling touches for a couple of my UI components in my view controller (custom subclass of UIViewController). It has methods touchesBegan:withEvent:, touchesMoved:withEvent:, and touchesEnded:withEvent:. It was working fine. Then I added a scroll view (UIScrollView) as the top view in the hierarchy.

現(xiàn)在我在視圖控制器上的觸摸處理程序不起作用.他們不會被召喚.有趣的是，我在滾動視圖中有各種其他的 UI 組件可以工作.有些是按鈕，有些是自定義視圖，它們定義了自己的 touchesBegan:withEvent: 等.唯一不起作用的是視圖控制器上的觸摸處理程序.

Now my touch handlers on the view controller don't work. They don't get called. The interesting thing is, I have various other UI components within the scroll view that do work. Some are buttons, some are custom views that define their own touchesBegan:withEvent:, etc. The only thing that doesn't work is the touch handlers on the view controller.

我想這可能是因為滾動視圖出于自己的目的攔截了這些觸摸，但我將 UIScrollView 子類化，只是為了看看我是否可以讓它工作，我總是從 返回 YES>touchesShouldBegin:withEvent:inContentView: 和 NO 始終來自 touchesShouldCancelInContentView:.還是不行.

I thought maybe it's because the scroll view is intercepting those touches for its own purposes, but I subclassed UIScrollView and just to see if I could get it to work I am returning YES always from touchesShouldBegin:withEvent:inContentView: and NO always from touchesShouldCancelInContentView:. Still doesn't work.

如果它有所不同，我的視圖控制器位于標(biāo)簽欄控制器中，但我認(rèn)為它不相關(guān).

If it makes a difference my view controller is within a tab bar controller, but I don't think it's relevant.

有沒有人遇到過這個問題并有現(xiàn)成的解決方案?我的猜測是滾動視圖猴子在響應(yīng)者鏈上.我可以猴子回來嗎?我想如果我想不出其他任何東西，我會將滾動視圖下的頂級視圖設(shè)為自定義視圖并將消息轉(zhuǎn)發(fā)到視圖控制器，但看起來很笨拙.

Has anyone had this problem and have a ready solution? My guess is the scroll view monkeys up the responder chain. Can I monkey it back? I guess if I can't figure anything else out I'll make the top level view under my scroll view be a custom view and forward the messages on to the view controller, but seems kludgy.

推薦答案

創(chuàng)建 UIScrollView 類的子類并覆蓋 touchesBegan: 和其他觸摸方法如下:

create a subclass of UIScrollView class and override the touchesBegan: and other touch methods as follows:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

// If not dragging, send event to next responder
  if (!self.dragging){ 
    [self.nextResponder touchesBegan: touches withEvent:event]; 
  }
  else{
    [super touchesBegan: touches withEvent: event];
  }
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

// If not dragging, send event to next responder
    if (!self.dragging){ 
     [self.nextResponder touchesMoved: touches withEvent:event]; 
   }
   else{
     [super touchesMoved: touches withEvent: event];
   }
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

  // If not dragging, send event to next responder
   if (!self.dragging){ 
     [self.nextResponder touchesEnded: touches withEvent:event]; 
   }
   else{
     [super touchesEnded: touches withEvent: event];
   }
}

這篇關(guān)于UIScrollView 防止視圖控制器上的 touchesBegan、touchesMoved、touchesEnded的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！