在 UIScrollView 中禁用 2 根手指滚动

发布于 2024-12-17 05:44:54 字数 819 浏览 1 评论 0原文

我想在 UIScrollView 中禁用两指滚动。
我对其进行了子类化，并使用以下代码调整了其内置手势识别器：

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，我可以成功禁用单指滚动并需要两次触摸。

有什么想法吗？

原文

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;
    }

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.

Any ideas?

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白况 2024-12-24 05:44:54

我意识到这是一个旧线程，但我花了很长时间才弄清楚，所以我想我会分享。这是我禁用两指滚动的方法：

// 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];

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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孤云独去闲 2024-12-24 05:44:54

如果您使用iOS SDK 5.0以上，也许您可以直接使用ui pan手势识别器。

@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;

......

[self.scrollView.panGestureRecognizer setMinimumNumberOfTouches:1];
[self.scrollView.panGestureRecognizer setMaximumNumberOfTouches:1];

if you are using iOS SDK over 5.0, maybe you can use ui pan gesture recognizer directly.

@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;

......

[self.scrollView.panGestureRecognizer setMinimumNumberOfTouches:1];
[self.scrollView.panGestureRecognizer setMaximumNumberOfTouches:1];

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静赏你的温柔 2024-12-24 05:44:54

我可以确认这在 iOS 8 中仍然是一个问题，但前提是 UIPanGestureRecognizer 位于 UIScrollView 的底层。使用新的 UIPanGestureRecognizer 创建 UIView 并设置其 MaximumNumberOfTouches 属性按预期工作。

提交了 rdar://20890684 并复制到 http://openradar.appspot.com/radar?id= 6191825677189120。请随意欺骗。

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惟欲睡 2024-12-24 05:44:54

问题：

当UIPanGestureRecognizer位于UIScrollView底层时> （不幸的是，这也会影响 UIPageViewController）maximumNumberOfTouches 的行为不符合预期 - minimumNumberOfTouches 但是始终正确限制下端。

当监视这些参数时，它们似乎完成了它们的工作 - 只是 UIScrollView 不尊重它们并忽略它们的值！

补救措施：

您可以在我的回答中找到解决方案：

UIScrollView 仅用一根手指滚动