如何比较iOS上的手势类型？ [英] How to compare the types of gestures on iOS?

问题描述

我在一个视图上有三种不同的手势，两种不同的类型。

I have three different gestures with two different types on one view.

首先是 UITapGestureRecognizer 和另外两个是 UILongPressGestureRecognizer 。

长按手势识别器有不同的 minimumPressDuration ，一个是 0.15 ，另一个是 0.50 ，所以我实现了以下功能，以便所有手势被识别：

The long press gesture recognizer have different minimumPressDuration, one is 0.15 and the other is 0.50, so to I implemented he following function so that all the gestures are recognized:

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer: (UIGestureRecognizer *) otherGestureRecognizer{
    return true;
}

该功能允许识别所有手势但问题是每当a UILongPressGestureRecognizer 被识别， UITapGestureRecognizer 也被识别。

The function does allow all the gestures to be recognized but the problem is whenever a UILongPressGestureRecognizer is recognized, a UITapGestureRecognizer is also recognized.

所以，我想知道如何比较中的gestureRecognizer类型

So, I want to know how can I compare the types of gestureRecognizer in

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer: (UIGestureRecognizer *) otherGestureRecognizer

或如何停止 UITapGestureRecognizer 当检测到 UILongPressGestureRecognizer 时，因为只要 UILongPressGestureRecognizer UILongGressureRecognizer 就会触发 code>被触发。

or how to stop the UITapGestureRecognizer when UILongPressGestureRecognizer is detected because UITapGestureRecognizer is triggered whenever UILongPressGestureRecognizer is triggered.

推荐答案

而不是返回 YES 对于中的所有情况shouldRecognizeSimultaneouslyWithGestureRecognizer：，如果你不想要手势要同时被识别，你应该实际返回否：

Instead of returning YES to all cases in shouldRecognizeSimultaneouslyWithGestureRecognizer:, if you don't want the gestures to be recognized simultaneously, you should actually return NO:

- (BOOL) gestureRecognizer: (UIGestureRecognize *) gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer: (UIGestureRecognizer *) otherGestureRecognizer {
   return NO;
}

但为了完成你显然想要完成的事情，我建议使用不同的 UIGestureRecognizerDelegate 方法 - gestureRecognizer：shouldBeRequiredToFailByGestureRecognizer： - 这样您就可以指定之前识别的手势另一个。在这种情况下，由于您要在检测到 UILongPressGestureRecognizer 时停止 UITapGestureRecognizer ，请尝试以下操作：

But to accomplish what you're apparently trying to accomplish, I'd recommend using a different UIGestureRecognizerDelegate method instead -- gestureRecognizer:shouldBeRequiredToFailByGestureRecognizer: -- so that you can specify which gesture is recognized before the other. In this case, since you'd like to stop the UITapGestureRecognizer when a UILongPressGestureRecognizer is detected, try this:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    // If the gesture recognizer is a UITapGestureRecongizer, but the other
    // gesture detected is a UILongPressGestureRecognizer, require the
    // UITapGestureRecognizer to fail.
    if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]] &&
        [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]]) {
       return YES;
    } else {
       return NO;
    }
}

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