使用UILongPressGestureRecognizer刪除MKA注釋

Question

我似乎無法讓長按手勢識別器在注釋視圖上工作，僅在地圖視圖上工作。 我的代碼的簡化版本是：

@interface AppDelegate : UIResponder <UIApplicationDelegate, CLLocationManagerDelegate, MKMapViewDelegate, UIGestureRecognizerDelegate, UIActionSheetDelegate>
{
    CLLocationManager *locationManager;

    // Views
    IBOutlet MKMapView *mapView;
    IBOutlet MKAnnotationView *annotationView;

    UILongPressGestureRecognizer *longPress;
}

以及AppDelegate.m中的部分實現...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    locationManager = [[CLLocationManager alloc] init];
    [locationManager setDelegate:self];

    [mapView setShowsUserLocation:YES];

    longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self 
                                                         action:@selector(deleteSelectedAnnotation:)];

    [[self window] makeKeyAndVisible];
    return YES;
}

- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
    annotationView = [views objectAtIndex:0];
    [annotationView addGestureRecognizer:longPress];
    id <MKAnnotation> mp = [annotationView annotation];
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 250, 250);
    [mv setRegion:region animated:YES];
}

- (IBAction)deleteSelectedAnnotation:(UIGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateBegan)
    {
        NSLog(@"long press");
        UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Delete Record?" 
                                                                 delegate:self 
                                                        cancelButtonTitle:nil 
                                                   destructiveButtonTitle:nil 
                                                        otherButtonTitles:@"Yes",@"No",nil];
                                      [actionSheet showInView:mapView];
                                      [actionSheet release];
    }
}

因此，如果我將[annotationView addGestureRecognizer:longPress]行中的視圖對象更改為mapView則整個工作正常。 但是我只希望操作在用戶按下注釋時發生，而不是在地圖上的任何地方。 我究竟做錯了什么？

謝謝。

Answer 1

您可以檢查觸摸是否在注釋視圖的范圍內：

UIView *annotationView = [mapView viewForAnnotation:myAnnotation];
if ( annotationView && CGRectContainsPoint(annotationView.bounds, [sender locationInView:annotationView]) )
{
    // we can continue
}