How to launch another app from an iPhone app

Question

I am working on a map application in my iPhone app.

I have a button go.

When the user clicks this button in this method I want to check if user

Answer 1

Note that on iOS you can also navigate to Google Maps -- and pass along the query string or geopoint. Here's one example of navigating to a specific geopoint:

if (self.mapView.userLocation.location) {
    NSString *urlAsString = [NSString stringWithFormat:@"comgooglemaps://?q=%f,%f", self.mapView.userLocation.location.coordinate.latitude, self.mapView.userLocation.location.coordinate.longitude];
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:urlAsString]]) {
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlAsString]];
    }
} 

Just a suggestion to enhance the user experience.