objective-c - MKMapView 上的 UITapGestureRecognizer 破坏了 MKAnnotation 选择

Question

我已经将 UITapGestureRecognizer 添加到 MKMapView 中，如下所示:

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]
                                      initWithTarget:self 
                                      action:@selector(doStuff:)];
[tapGesture setCancelsTouchesInView:NO]; 
[tapGesture setDelaysTouchesEnded:NO]; 
[[self myMap] addGestureRecognizer:tapGesture];
[tapGesture release];

这几乎可以工作:识别点击手势并且双击仍然可以缩放 map 。不幸的是，UITapGestureRecognizer 会干扰 MKAnnotationView 元素的选择和取消选择，这些元素也是由点击手势触发的。

设置 setCancelsTouchesInView 和 setDelaysTouchesEnded 属性没有任何效果。如果我不添加 UIGestureRecognizer，注释选择工作正常。

我错过了什么？

更新:

正如下面 Anna Karenina 所建议的，可以通过在 shouldRecognizeSimultaneouslyWithGestureRecognizer: 委托(delegate)方法中返回 YES 来避免这个问题。

更多详情请参见 this answer .

Answer 1

代替点击手势，添加长按手势如下:-

UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] 
        initWithTarget:self action:@selector(longpressToGetLocation:)];
    lpgr.minimumPressDuration = 2.0;  //user must press for 2 seconds
    [mapView addGestureRecognizer:lpgr];
    [lpgr release];


- (void)longpressToGetLocation:(UIGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state != UIGestureRecognizerStateBegan)
        return;

    CGPoint touchPoint = [gestureRecognizer locationInView:self.mapView];   
    CLLocationCoordinate2D location = 
        [self.mapView convertPoint:touchPoint toCoordinateFromView:self.mapView];

    NSLog(@"Location found from Map: %f %f",location.latitude,location.longitude);

}