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iphonemapkituserlocation

Check if user location is visible on map iphone

I want to hide or show a UIButton weather user's current location is visible on map. While testing the code xcode I can see meassage "User location view is NOT visible but should be. Showing...." on console in "didUpdateLocation" method if users location is not visible on map. How can I use this message to generate events in my case to hide or show a UIButton? Thanks for any help in advance.

Solution

  • If you want to know whether the user location is contained in the currently displayed map region, you can check the userLocationVisible property in the regionDidChangeAnimated delegate method:

    - (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    someButton.hidden = !mapView.userLocationVisible;
}

    If you just want to know whether the user location currently has a value (whether it's visible or not and whether showsUserLocation is on or not), then:

    if (mapView.userLocation.location == nil)
    NSLog(@"user location not obtained yet");
else
    NSLog(@"user location available (may or may not be currently visible)"):