Iphone UIScrollView触控开始

所以我只想在用户触摸UIScrollView时播放声音。 UIScrollViewDelegate具有ScrollViewWillBeginDraging:方法，但它仅在touchMoved时被调用。我想让它在触摸屏上被调用

尝试触摸开始：withEvent:但它没有收到任何触摸。

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有人有线索吗？

我认为您必须将UIScrollView子类化才能做到这一点

ToucheSBegind:withEvent:仅发送到UIView的子类。您可能正在控制器中实现touchsbegind:withEvent:触摸，对吗？如果是这样的话，从那里就不行了

或者，如果您将UIView的子类（您编写的）放在UIScrollView中，您还可以从那里捕获TouchesBegind事件（但仅当用户触摸该特定子视图时）。

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默认情况下，UIScrollView会将触摸传递到其子视图（请参见UIScrollView中的ToucheShouldBegin:withEvent:inContentView）。

您应该在UIScrollView上，而不是在UIScrollViewDelegate上添加ToucheSBegind:withEvent:。

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UIScrollView是UIResponder的一个子类，它具有触摸事件。

您也可以在控制器中响应这些事件。为此，您必须（在控制器中）定义此功能：

然后，在“视图显示”中，您需要调用“becomeFirstResponder”：

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self becomeFirstResponder];

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关于这个问题的最新更新（包括ZoomScrollView源代码的链接+一些关于UIScrollView内部结构的优秀解释）。另外，请查看苹果更新的示例。

改用轻触手势识别器：

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touch)];
[recognizer setNumberOfTapsRequired:1];
[recognizer setNumberOfTouchesRequired:1];
[scrollView addGestureRecognizer:recognizer];

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touch)];
[recognizer setNumberOfTapsRequired:1];
[recognizer setNumberOfTouchesRequired:1];
[scrollView addGestureRecognizer:recognizer];  

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请改用轻触手势识别器：

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touch)];
[recognizer setNumberOfTapsRequired:1];
[recognizer setNumberOfTouchesRequired:1];
[scrollView addGestureRecognizer:recognizer];

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touch)];
[recognizer setNumberOfTapsRequired:1];
[recognizer setNumberOfTouchesRequired:1];
[scrollView addGestureRecognizer:recognizer];  

或

创建

UIScrollView

的子类并实现所有

    -(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 touchesEnded: touches withEvent: event];
  }
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

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

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

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Rajneesh071用swift 4回答 将脚本中scrollView的自定义类更改为

CustomScrollView

import Foundation

class CustomScrollView: UIScrollView {
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if !isDragging {
            next?.touchesBegan(touches, with: event)
        } else {
        super.touchesBegan(touches, with: event)
        }
    }
}

<代码>导入基础 类CustomScrollView:UIScrollView{ 覆盖func TouchesBegind（Touchs:Set，带有事件：UIEvent？）{ 如果！我是拉格{ 下一步？触摸开始（触摸，带有：事件） }否则{ super.touchesbeated（touches，with:event） } } }

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您需要将scroll view子类化，然后实现touchesBegind方法。您还需要将delayTouchDown属性设置为false。

如果

UIScrollView

是

UIScrollViewDelegate

该怎么办？好的，这是可行的，但是我应该如何声明该方法“touch”要接收用户触摸的位置？@HernanArber例如：@Rajneesh071您在哪里处理布尔“拖动”？当子类化

UIScorllView

时，是否会自动处理它？@jeet.chanchawat Dude是UIScrollView的子类，拖动是UIScrollView的布尔属性