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iphonescreensleepuserlocation

iPhone how to tell application when iPhone screen sleeps

I'm making an iPhone application that uses the user location, however I've noticed that when the iPhone screen sleeps/turns off, the phone is still using user location. So is there a function that can tell me when the screen sleeps so i can stopUpdatingLocation?

@interface RideauAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
    UIWindow *window;
    UITabBarController *tabBarController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;

@end
Solution

  • You can use:

    - (void)applicationWillResignActive:(UIApplication *)application {
    [[[self.tabBarController.viewControllers objectAtIndex:0] locationManager] stopUpdatingLocation]; 
    //if it is your first VC, if not change objectAtIndex: to the correct one

}