如何在 MKMapView 上捕获点击手势 [英] How to capture Tap gesture on MKMapView

问题描述

我正在尝试在我的 MKMapView 上捕获点击事件，这样我可以在用户点击的位置放置一个 MKPinAnnotation.基本上我有一张用 MKOverlayViews 覆盖的地图(显示建筑物的覆盖)，我想在用户点击该覆盖时通过放置 MKPinAnnotaion 为他们提供更多信息并在标注中显示更多信息.谢谢你.

I am trying to capture tap event on my MKMapView, this way I can drop a MKPinAnnotation on the point where user tapped. Basically I have a map overlayed with MKOverlayViews (an overlay showing a building) and I would like to give user more information about that Overlay when they tap on it by dropping a MKPinAnnotaion and showing more information in the callout. Thank you.

推荐答案

您可以使用 UIGestureRecognizer 来检测地图视图上的触摸.

You can use a UIGestureRecognizer to detect touches on the map view.

不过，我建议寻找双击(UITapGestureRecognizer)或长按(UILongPressGestureRecognizer)，而不是单击.单击可能会干扰用户尝试单击图钉或标注本身.

Instead of a single tap, however, I would suggest looking for a double tap (UITapGestureRecognizer) or a long press (UILongPressGestureRecognizer). A single tap might interfere with the user trying to single tap on the pin or callout itself.

在您设置地图视图的位置(例如在 viewDidLoad 中)，将手势识别器附加到地图视图:

In the place where you setup the map view (in viewDidLoad for example), attach the gesture recognizer to the map view:

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

或使用长按:

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];
}

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