app crashes if gps location is not in map

HamzaHaroon

i try to enable gps and get this erro:

"Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan nan]'

This error is because my current location is not in the map i am loading. how do i fix my code to be able to catch this error and display a message?

here is my code for displaying gps location

if (!self.mapView.gps.enable)
[self.mapView.gps start];
else
[self.mapView.gps stop];

HamzaHaroon

what can i do to stop my app from crashing when i start the gps?

edit:

I got it. I used the CLLocationManager to create a CLLocationCoordinate2d object and then converted that into an agspoint with spatial reference wgs84.

then i just checked that point with the mapViews maxEnvelope