ios - 如何比较iOS上的手势类型？

Question

我在一个 View 上有两种不同类型的三种不同手势。

第一个是 UITapGestureRecognizer，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所有手势都被识别:

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

该函数确实允许识别所有手势，但问题是每当 UILongPressGestureRecognizer 被识别时，UITapGestureRecognizer 也会被识别。

所以，我想知道如何比较

中的 gestureRecognizer 类型

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

或者如何在检测到 UILongPressGestureRecognizer 时停止 UITapGestureRecognizer，因为每当触发 UILongPressGestureRecognizer 时都会触发 UITapGestureRecognizer。

Answer 1

shouldRecognizeSimultaneouslyWithGestureRecognizer: 中的所有情况都不会返回YES:如果您不想同时识别手势，您实际上应该返回NO:

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

但要完成您显然想要完成的任务，我建议您改用另一种 UIGestureRecognizerDelegate 方法——gestureRecognizer:shouldBeRequiredToFailByGestureRecognizer:——这样你可以指定先识别哪个手势。在这种情况下，由于您想在检测到 UILongPressGestureRecognizer 时停止 UITapGestureRecognizer，请尝试以下操作:

- (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;
    }
}