Question

I’m trying to recreate the feature of Google Maps that changes the map type to hybrid or satellite or standard. I have setup a view that’s displayed in a partial curl transition. Within this view, is a UISegmentedControl. When it’s value is changed, the following code is executed:

- (IBAction)setMap:(id)sender {
switch (((UISegmentedControl *) sender).selectedSegmentIndex) {
    case 0:
        [self curlViewControllerDidFinish:nil];
        [mapview setMapType:MKMapTypeStandard];
        break;

    case 1:
        [self curlViewControllerDidFinish:nil];
        [mapview setMapType:MKMapTypeSatellite];
        break;

    case 2:
        [self curlViewControllerDidFinish:nil];
        [mapview setMapType:MKMapTypeHybrid];
        break;

    }
}

The curl transition does finish, but the mapType does not change. I have tried putting the [mapview setmapType... above the [self curlViewControllerDidFinish....

Note: [mapview setMapType:MKMapTypeHybrid]; does change the mapType with 1 line of code if executed outside of the curl transition.

Any ideas on how to fix this?

Answer 1

The iOS Maps.app most likely uses a delegate to inform the map view that the modal view has selected a new option. Something like this:

- (IBAction)setMap:(id)sender {
switch (((UISegmentedControl *) sender).selectedSegmentIndex) {
    case 0:
        [self curlViewControllerDidFinish:nil];
        [self.delegate setMapType:MKMapTypeStandard];
        [self dismissModalViewControllerAnimated:YES];
        break;

    case 1:
        [self curlViewControllerDidFinish:nil];
        [self.delegate setMapType:MKMapTypeSatellite];
        [self dismissModalViewControllerAnimated:YES];
        break;

    case 2:
        [self curlViewControllerDidFinish:nil];
        [self.delegate setMapType:MKMapTypeHybrid];
        [self dismissModalViewControllerAnimated:YES];
        break;

    }
}