在 UIScrollView 中禁用 2 指滚动 [英] Disable 2 finger scrolling in UIScrollView

问题描述

我想在我的 UIScrollView 中禁用两指滚动.
我将其子类化并使用以下代码调整其内置手势识别器:

I'd like to disable two-finger scrolling in my UIScrollView.
I subclassed it and tweaked its built-in gesture recognizers with the following code:

for (UIGestureRecognizer *mgestureRecognizer in scroller.gestureRecognizers) {     
    if ([mgestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
    {
        UIPanGestureRecognizer *mpanGR = (UIPanGestureRecognizer *) mgestureRecognizer;
        mpanGR.minimumNumberOfTouches = 1; 
        mpanGR.maximumNumberOfTouches = 1;

    }

    if ([mgestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]])
    {
        UISwipeGestureRecognizer *mswipeGR = (UISwipeGestureRecognizer *) mgestureRecognizer;
        mswipeGR.numberOfTouchesRequired = 1;
    }

出于某种原因，maximumNumberOfTouches 似乎不起作用.我仍然可以用一根或两根手指滚动.如果我将两个属性都更改为 2，我可以成功禁用单指滚动并需要两次触摸.

For some reason, maximumNumberOfTouches does not seem to work. I can still scroll with one or two fingers. If I change both properties to 2, I can successfully disable one-finger scrolling and require two touches.

有什么想法吗?

推荐答案

我意识到这是一个旧线程，但我花了很长时间才弄明白，所以我想我会分享.这是我为禁用两指滚动所做的操作:

I realize this is an old thread, but it took me a long time to figure this out, so I thought I would share. Here's what I did to disable two-finger scrolling:

// set up a two-finger pan recognizer as a dummy to steal two-finger scrolls from the scroll view
// we initialize without a target or action because we don't want the two-finger pan to be handled
UIPanGestureRecognizer *twoFingerPan = [[UIPanGestureRecognizer alloc] init];
twoFingerPan.minimumNumberOfTouches = 2;
twoFingerPan.maximumNumberOfTouches = 2;
[scrollView addGestureRecognizer:twoFingerPan];

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