ios4 - 如何在MKMapView上捕获轻击手势

Question

我试图捕获MKMapView上的tap事件，这样我可以在用户点击的位置放一个MKPinAnnotation。基本上，我的 map 上覆盖了MKOverlayViews(显示建筑物的覆盖层)，当用户点击该覆盖层时，我想通过放下MKPinAnnotaion并在标注中显示更多信息来向其提供有关该覆盖层的更多信息。
谢谢。

Answer 1

您可以使用UIGestureRecognizer来检测 map View 上的触摸。

但是，我建议不要双击，而要双击(UITapGestureRecognizer)或长按(UILongPressGestureRecognizer)。单击可能会干扰用户尝试单击图钉或标注本身的情况。

在设置 map View 的地方(例如，在viewDidLoad中)，将手势识别器附加到 map View :

UITapGestureRecognizer *tgr = [[UITapGestureRecognizer alloc] 
    initWithTarget:self action:@selector(handleGesture:)];
tgr.numberOfTapsRequired = 2;
tgr.numberOfTouchesRequired = 1;
[mapView addGestureRecognizer:tgr];
[tgr release];

或长按:

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

在 handleGesture:方法中:

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

    CGPoint touchPoint = [gestureRecognizer locationInView:mapView];
    CLLocationCoordinate2D touchMapCoordinate = 
        [mapView convertPoint:touchPoint toCoordinateFromView:mapView];

    MKPointAnnotation *pa = [[MKPointAnnotation alloc] init];
    pa.coordinate = touchMapCoordinate;
    pa.title = @"Hello";
    [mapView addAnnotation:pa];
    [pa release];
}