how to find if mapkit failed to get userlocation?

I want to find that if mapkit failed to get user location(开发者_运维技巧fails to show blue blob at user location) and show alert and then relocate the location again.i don't want to use corelocation.plz help me.

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You might try to use the delegate methods that gets called to see if the blue dot is being asked for:

- (MKAnnotationView *) mapView: (MKMapView *)aMapView viewForAnnotation: (id )annotation 
{               
    if (annotation == aMapView.userLocation) 
    {
        return nil; // this might be the moment the location was first detected
    }
}

You could assume that the blue dot is only asked for after the location is known to map kit. However, I think this would not be a good idea as those things might easily break in the next version of the SDK.

I would recommend to use Core Location. It is relatively easy to use and gives you all the flexibility and stability over the long run.