取消当前 UIScrollView 触摸 [英] Cancel current UIScrollView touch

问题描述

我有一个带有几个子视图的 UIScrollView 等等.我也是scrollView的delegate，并实现了- (void)scrollViewDidScroll:(UIScrollView *)scrollView.在我的卷轴下面有另一个视图.

I have an UIScrollView with a few subviews and so on. I am also the scrollView's delegate and have implemented the - (void)scrollViewDidScroll:(UIScrollView *)scrollView. Underneath my scroll there is another view.

如果滚动视图的 contentOffset 在 x 轴上低于 50px，我想显示该视图，重置"滚动视图的 contentOffset 并取消当前的滚动视图手势，以便用户不会在新视图出现时操作其内容.

I want to show that view if the scrollView's contentOffset goes under 50px on x axis, "reset" scrollView's contentOffset and cancel the current scrollView gesture so that the user wont manipulate its content when the new view appears.

我已经实现了这样的方法:

I have implemented the method like so:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView.contentOffset.x < -50)
    {
        scrollView.contentOffset = CGPointZero;
        [self showBackView];
        //here I want to cancel the current touch on the scrollview since it keeps scrolling if I drag my finger
    }
}

我曾尝试将 userInteractionEnabled 属性设置为 NO 但只有在触摸结束后才会生效.而且我尝试了许多其他属性，但似乎都没有.

I have tried to set the userInteractionEnabled property to NO but it takes effect only after the touch has ended. And I have tried a bunch of other properties but none seems to work.

我该如何解决这个问题?

How can I fix this?

推荐答案

尝试禁用滚动视图的 panGestureRecognizer(然后重新启用它).这将取消识别器的当前会话:

Try disabling the panGestureRecognizer for the scroll view (and then reenabling it). This will cancel the current session of the recogniser:

self.scrollView.panGestureRecognizer.enabled = NO;
self.scrollView.panGestureRecognizer.enabled = YES;

斯威夫特

self.scrollView.panGestureRecognizer.isEnabled = false
self.scrollView.panGestureRecognizer.isEnabled = true

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