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

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)        return;    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 app MapCallouts.

Thanks to Anna for providing such a great answer! Here is a Swift version if anybody is interested (the answer has been updated to Swift 4.1 syntax).

Creating UILongPressGestureRecognizer:

let longPressRecogniser = UILongPressGestureRecognizer(target: self, action: #selector(MapViewController.handleLongPress(_:)))longPressRecogniser.minimumPressDuration = 1.0mapView.addGestureRecognizer(longPressRecogniser)

Handling the gesture:

@objc func handleLongPress(_ gestureRecognizer : UIGestureRecognizer){    if gestureRecognizer.state != .began { return }    let touchPoint = gestureRecognizer.location(in: mapView)    let touchMapCoordinate = mapView.convert(touchPoint, toCoordinateFrom: mapView)    let album = Album(coordinate: touchMapCoordinate, context: sharedContext)    mapView.addAnnotation(album)}