MKAnnotationView上的UILongPressGestureRecognizer不适用于单点触摸

问题描述

我一直试图在MKAnnotationView子类中使用UILongPressGestureRecognizer.有趣的是，手势识别器仅在使用两个矿石手指/触摸时才触发.

I've been trying to use a UILongPressGestureRecognizer in a MKAnnotationView subclass. Interestingly the gesture recognizer only triggers when using two ore fingers/touches.

是什么导致手势识别器仅需轻触一次即可触发?

What prevents the gesture recognizer to get triggered with only one touch?

实施

UILongPressGestureRecognizer *pressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self
                                                                                                      action:@selector(handleLongPress:)];
pressRecognizer.minimumPressDuration = 0.25;
pressRecognizer.numberOfTapsRequired = 0;
pressRecognizer.numberOfTouchesRequired = 1;

正常UIView中的相同实现显示了一次触摸即可实现的预期行为.但是可以使用touchesBegan:和touchesEnded:来获得长按手势，但我仍然很好奇这是什么原因.

The same implementation in a normal UIView shows the expected behaviour working with one touch. Yet it's possible to use touchesBegan: and touchesEnded: to get a long press gesture working I'm still curious what the reason for this is.

推荐答案

您是否看到过问题?

要使用我的UILongPressGestureRecognizer，我禁用了AnnotationView并向其中添加了GestureRecognizer:

For using my UILongPressGestureRecognizer I disabled AnnotationView and added GestureRecognizer to it:

[ann_view setEnabled:NO];
UILongPressGestureRecognizer* long_press = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAnnotationView:)];
long_press.minimumPressDuration = 1.5;
[ann_view addGestureRecognizer:long_press];
[long_press release];

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