objective-c - 在 UIScrollView 中禁用 2 指滚动

Question

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

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。如果我将这两个属性都更改为 2，我可以成功地禁用单指滚动并需要两次触摸。

有什么想法吗？

Answer 1

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。这是我为禁用双指滚动所做的操作:

// 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];