Move a pin according to the position of the user

In my iPhone appli开发者_如何学运维cation, I want to drop a pin at my current location using mapView and I also need to move another pin or a ball as my position changes. How can I do this?

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To display user location, just add :

mapView.showsUserLocation = YES;

To get it, use the method userLocation which gives you a MKUserLocation.

You can then add a id<MKAnnotation> object with addAnnotation method to display another pin.