ios - 禁用 UIScrollView 拖动事件到特定方向并将事件发送到超级

Question

我有UIView并且我附加了一个UIPanGestureRecognizer. 在UIView我启用了分页的情况下，我设置了内容大小，因此scrollViewUIScrollView可以滚动到左侧。

问题：

我希望当用户尝试将 scrollView 向右拖动时，将事件发送到 UIView 以便“UIPanGestureRecognizer”可以处理触摸事件

Answer 1

最后，在 6 小时后我发现我子类化UIScrollView并实现了gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer委托方法

当用户拖动滚动视图时，此方法被调用(BOOL)gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer，默认情况下它返回 NO

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    if (self.contentOffset.x > 0 &&  self.contentOffset.x <= self.contentSize.width - self.frame.size.width) {
        //user is in middle of dragging the scrollView don't allow any other gestureRecognizer to respond
        return NO;
    }else{
        //scrollView contentOffset is 0 and user is not dragging the scrollView so let other gestureRecognizer to respond
        return YES;
    }
}

Answer 2

在尝试使用 homam 的答案时，我意识到scrollView.panGestureRecognizer在return NO. 我想要的是我的自定义平移识别器被切断并且滚动视图仍然滚动。我认为这可能是在不同级别添加手势的结果，我不确定。

然而，我找到了一个解决方案，通过更改我的自定义手势识别器来检查scrollView.contentOffset并且不激活，除非它大于零。一旦归零，我也关闭了该scrollView.bounce属性。scrollView.contentOffset当在我的 scrollView 上向下滚动时，它会走到尽头，我的手势识别器会立即接管并像我想要的那样将超级视图移开。

这是我的自定义平移手势的骨架

- (void)customPan:(UIPanGestureRecognizer*)panRecognizer
{
    if(panRecognizer.state == UIGestureRecognizerStateBegan)
    {
        //do begin stuff
    }

    if(panRecognizer.state == UIGestureRecognizerStateChanged)
    {
        if(self.scrollView.contentOffset.y > 0)
        {
            //do begin stuff to make sure it’s initialized properly when it does start to change
            self.scrollView.bounces = YES;
            return;
        }
        else
        {
            self.scrollView.bounces = NO;
        }

        //do change stuff
    }

    if(panRecognizer.state == UIGestureRecognizerStateEnded)
    {
        if(self.scrollView.contentOffset.y > 0)
        {
            //do begin stuff to make sure it’s initialized properly when it does start to change
            self.scrollView.bounces = YES;
            return;
        }
        else
        {
            self.scrollView.bounces = NO;
        }

        //do end stuff

    }
}

Answer 3

[myScrollView setContentSize:CGSizeZero];