Tuesday, April 10, 2012

How to add a push pin to a MKMapView(IOS) when touching?

I had to get the coordonate of a point where the user touch on a MKMapView. I'm not working with the Interface Builder. Can you give me one example or a link.

Thanks a lot

Source: Tips4all


  1. You can use a UILongPressGestureRecognizer for this. Wherever you create or initialize the mapview, first attach the recognizer to it:

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

    Then in the gesture handler:

    - (void)handleLongPress:(UIGestureRecognizer *)gestureRecognizer
    if (gestureRecognizer.state != UIGestureRecognizerStateBegan)

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

    YourMKAnnotationClass *annot = [[YourMKAnnotationClass alloc] init];
    annot.coordinate = touchMapCoordinate;
    [self.mapView addAnnotation:annot];
    [annot release];

    YourMKAnnotationClass is a class you define that conforms to the MKAnnotation protocol. If your app will only be running on iOS 4.0 or later, you can use the pre-defined MKPointAnnotation class instead.

    For examples on creating your own MKAnnotation class, see the sample apps WeatherMap and MapCallouts.

  2. I have a UIImageView with a UILongPressGestureRecognizer attached that never seems to detect a long press gesture no matter how I configure the gesture recognizer.