MKMapView: On startup user location -> zooming - iphone

Question

I have a MKMapView and in the Map View "Show User Location" is set. The question if the app should use my location, I say yes. Then I see the blue bullet and I can zoom to the current location.
I read many other posts about this, but nothing solve the problem, that the user location won't zoom in automatically.
I want to have a zoom on startup if the user allows access the location, otherwise a defined coordinate should zoom in. (after, is the use allows the location, it can be updated, but should not set the center to the user location everytime I get updates on the location).
What are the steps to implement this behavior? I tried for example this: How do I zoom an MKMapView to the users current location without CLLocationManager? with the KVO but it does not work...
I hope someone has an idea?
Best Regards, Tim

Answer 1

Have you tried the delegate method mapView:didUpdateUserLocation:?
I used something like this in my code:
In the .h file:
#property (nonatomic, retain) CLLocation* initialLocation;
And in the .m file:
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
if ( !initialLocation )
{
self.initialLocation = userLocation.location;
MKCoordinateRegion region;
region.center = mapView.userLocation.coordinate;
region.span = MKCoordinateSpanMake(0.1, 0.1);
region = [mapView regionThatFits:region];
[mapView setRegion:region animated:YES];
}
}

Answer 2

you can do it like this in your viewDidLoad write this code
self.mapDetail.showsUserLocation = YES;
[self.mapDetail.userLocation addObserver:self
forKeyPath:#"location"
options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)
context:nil];
and this method will do the task
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
MKCoordinateRegion region;
region.center = self.mapDetail.userLocation.coordinate;
MKCoordinateSpan span;
span.latitudeDelta = 1; // Change these values to change the zoom
span.longitudeDelta = 1;
region.span = span;
[self.mapDetail setRegion:region animated:YES];
[self.mapDetail.userLocation removeObserver:self forKeyPath:#"location"];
}