检测UiScrollView上的触摸位置 [英] Detect touch position on UiScrollView

问题描述

我需要从UIScrollView获取触摸位置。但是当我为我的scrollview创建一个子类时：

I need to get the touch position from a UIScrollView. But when I create a subclass for my scrollview :

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
  NSArray *touchesArray = [touches allObjects];
  UITouch *touch = (UITouch *)[touchesArray objectAtIndex:0];
  CGPoint point = [touch locationInView:self];
  self.position = point;}

函数 touchesBegan 并不总是被调用。
如果我快速滑动， touchesBegan 永远不会被调用，但 scrollViewDidScroll 会被直接调用。

The function touchesBegan isn't always called. If I swipe fast, touchesBegan is never called, but scrollViewDidScroll gets directly called instead.

我无法使用 UIGesture（UITapGestureRecognizer，...），因为用户不会点按或滑动。

I can't use UIGesture (UITapGestureRecognizer, ... ) because users don't tap or swipe.

是否还有其他方法可以从UIScrollView获得头寸？

Are there others methods to get the position from UIScrollView ?

编辑：

谢谢你： https://stackoverflow.com/a/15763450/1752843

UIScrollView子类：

UIScrollView subclass :

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
    self.position = point;
    return self;
}

推荐答案

我看到答案，我认为它可以解决您的问题。似乎SDK不再将触摸处理方法传递给UIScrollView子类。所以，您应该执行 hitTest：将触摸传递给您的子类。

I saw an answer in SO that I think that it can solve you problem. It seems that the SDK doesn't pass the touch handling methods to the UIScrollView subclasses anymore. So, you should to perform a hitTest: to pass the touches to your subclass.

查看答案了解更多信息。

See the answer for more information.

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