Question

I’ve noticed that in my app, when I call startUpdatingLocation, my UI locks up briefly while i presume the device gathers the location data. Is this typical and is there any way to limit this? heres what my code looks like

    -(void)getUserLocation {
    if (!locationManager) 
    {
        locationManager = [[CLLocationManager alloc]init];
    }

    [locationManager setDelegate:self];
    [locationManager startUpdatingLocation];

}

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    self.userCoordinate = newLocation.coordinate;

    NSLog(@"user coordinate in location manager: %f,%f",self.userCoordinate.latitude,self.userCoordinate.longitude);
    [locationManager stopUpdatingLocation];
    locationManager = nil;

    userLocationAvailable = YES;
    [self getDataForScrollView];

}

any ideas? Thanks!

Answer 1

That’s because you are getting the location in the main thread, whereas the main thread is used to responsible for UI stuff . i.e. user touch events. that’s why u feel your app has a bit of lag.

That’s quite normal if you do a large task ( e.g. get data from web server) in main thread. You could put a “Loading” spin view to indicate the user instead of make your UI frozen.

Alternatively, you could try to get the location in another thread . I was trying to do this too but i have not succeeded yet. So i am currently doing with the first approach.