iphone - 我怎样才能捕捉到 MapView 上的点击，然后将它传递给默认的手势识别器？

Question

这就是我想要的 - 用户在 map 上点击，我的代码被执行，然后系统代码被执行(如果用户点击了注释标注等...)。

我在 map View 中添加了简单的点击识别器:

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(mapViewTapped:)];
[self.mapView addGestureRecognizer:tapGestureRecognizer];
[tapGestureRecognizer release];

在 mapViewTapped 中，我的代码被执行。现在我想通知点击的系统代码(例如显示标注)。我怎么做？如何传递我拦截的事件？

Answer 1

一种方法是实现 UIGestureRecognizerDelegate 方法 gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: 并在其中返回 YES:

//add <UIGestureRecognizerDelegate> to .h to avoid compiler warning

//add this where you create tapGestureRecognizer...
tapGestureRecognizer.delegate = self;

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

现在您的 mapViewTapped: 将被调用，然后 map View 的识别器将调用其方法。如果点击是在注释 View 上，则 map View 将显示其标注(如果您已实现，将调用 didSelectAnnotationView 委托(delegate)方法)。

另一种方式，如果你需要更多的控制，那么在你的 mapViewTapped: 中，你可以检查点击是否在注释 View 上，然后手动选择注释，然后将显示其标注(并调用 didSelectAnnotationView 委托(delegate)方法):

-(void)mapViewTapped:(UITapGestureRecognizer *)tgr
{
    CGPoint p = [tgr locationInView:mapView];

    UIView *v = [mapView hitTest:p withEvent:nil];

    id<MKAnnotation> ann = nil;

    if ([v isKindOfClass:[MKAnnotationView class]])
    {
        //annotation view was tapped, select it...
        ann = ((MKAnnotationView *)v).annotation;
        [mapView selectAnnotation:ann animated:YES];
    }
    else
    {
        //annotation view was not tapped, deselect if some ann is selected...
        if (mapView.selectedAnnotations.count != 0)
        {
            ann = [mapView.selectedAnnotations objectAtIndex:0];
            [mapView deselectAnnotation:ann animated:YES];
        }
    }
}