ios mapkit 通过点击地图关闭注释标注

Question

我有一个地图套件应用程序，可以在地图上放置注释，当您按下它们时，它会显示带有标题属性的标注。

这工作正常，但用户无法关闭它们。它们保持打开状态，直到点击另一个注释。我不能让用户可以点击地图上的其他位置（或再次点击注释）来关闭它吗？

我有一种感觉这是默认设置，所以也许我正在做的事情是把它填满？我有一个手势识别器，用它来检测一些地图点击，

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                            initWithTarget:self action:@selector(handleTap:)];
tap.numberOfTapsRequired = 1;

[self.mapView addGestureRecognizer: tap];

从而触发此操作：

- (void)handleTap:(UITapGestureRecognizer *)sender {     
if (sender.state == UIGestureRecognizerStateEnded)  {   


    CGPoint tapPoint = [sender locationInView:sender.view.superview];
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint: tapPoint toCoordinateFromView: self.mapView];

    if (pitStopMode && !pitStopMade){
            pitStopMade = YES;
        InfoAnnotation *annotation = [[InfoAnnotation alloc]
                       initNewPitstopWithCoordinate:coordinate];
        NSLog(@" Created Pit Stop");

        annotation.draggable = NO;
        //place it on the map
        [self.mapView addAnnotation: annotation];

        self.instructionLabel.text = @"Tap button again to remove";
        annotation.creatorId = self.localUser.deviceId;
        //send it to the server
        [annotation updateLocationWithServerForConvoy: self.convoyCode];        

        [annotation release];

    }  

    if (hazardMode && !hazardMade){
            hazardMade = YES;
        InfoAnnotation *annotation  = [[InfoAnnotation alloc]
                       initNewHazardWithCoordinate:coordinate];         
        NSLog(@" Created Hazard");

        annotation.draggable = NO;
        //place it on the map
        [self.mapView addAnnotation: annotation];

        self.instructionLabel.text = @"Tap button again to remove";
        annotation.creatorId = self.localUser.deviceId;
        //send it to the server
        [annotation updateLocationWithServerForConvoy: self.convoyCode];        

        [annotation release];


    }
}

}

我需要做些什么才能让这些点击进入地图视图吗？拖动和点击注释效果很好，所以我不确定这是否是造成这种情况的原因？

我是否缺少一个选项，或者我是否必须尝试手动实施此选项？

Answer 1

您可以实现 UIGestureRecognizerDelegate 方法 gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: 并返回 YES （因此地图视图自己的点击手势识别器也将执行其方法）。

首先，将协议声明添加到视图控制器的接口中（以避免编译器警告）：

@interface MyViewController : UIViewController <UIGestureRecognizerDelegate>

接下来，在手势识别器上设置 delegate 属性：

tap.delegate = self;

最后，实现方法：

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

如果由于某种原因这不起作用，您也可以在 handleTap: 方法顶部手动取消选择任何当前选定的注释：

for (id<MKAnnotation> ann in mapView.selectedAnnotations) {
    [mapView deselectAnnotation:ann animated:NO];
}

即使地图视图最多只允许一个注释要一次选择，selectedAnnotations 属性是一个 NSArray，因此我们循环遍历它。

Answer 2

安娜解释得很好。我也想用确切的代码来解释。你可以这样做

     UITapGestureRecognizer *tapMap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(closeCallout:)];
      [self.mapView addGestureRecognizer:tapMap];

-(void) closeCallout:(UIGestureRecognizer*) recognizer 
        {
           for (id<MKAnnotation> ann in mapView.selectedAnnotations) 
           {
               [mapView deselectAnnotation:ann animated:NO];
           }      


        }