Make a MKAnnotation placemark always visible

I want the placemark (title and subtitle) of a MKAnnotation object to be visible on the mapview at anytime without开发者_StackOverflow clicking on it.

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You can use this in you map ViewController

(void)viewWillAppear:(BOOL)animated
{
  [super viewWillAppear:animated];
  [myMapView selectAnnotation:myAnnotation animated:YES];
}