Question

I am developing an app in which i need to use map kit(first time) and i am also new in iphone. My requirement is that user can edit location and set his desired location using pin. I follow many tutorial but i couldn’t get this that users can change location to move pin on map. Any help plz, thnx.

Answer 1

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

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];

or to use a long press:

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

In the handleGesture: method:

- (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];
}