blank gap when adding view inside UIViewController - c

Question

I just ran into a problem where when I'm adding a new view to my UIViewController there is a small gap on the top. (Appears to be the height of the status bar)
I use pushViewController to show this view, like this:
MapViewController *map = [[[MapViewController alloc] init] autorelease];
[self.navigationController pushViewController:map animated:YES];
In my MapViewController I just create a MKMapView with the same frame as the view controller.
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor redColor];
_mapView = [[MKMapView alloc] initWithFrame:self.view.frame];
[self.view addSubview:_mapView];
}
But it turns out to be like this:
I'm not sure if I'm still missing something here ...

Answer 1

Try this instead:
_mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
The frame of a UIView is in the co-ordinate system of the superview.
The bounds of a UIView, on the other hand, is in the co-ordinate system of the view itself.
In this case, the frame of self.view will be taking into account the status bar (as that's how it sits on the screen) - hence the status bar sized offset at the top.