uiapplicationdelegate

I have a storyboard set up with working login and main view controller, the latter is the view controller to which the user is navigated to when login is successful. My objective is to show the main view controller immediately if the authentication (stored in keychain) is successful, and show the login view controller if the authentication failed. Basically, I want to do this in my AppDelegate: // url request & response work fine, assume success is a BOOL here // that indicates whether login was successful or not if (success) { // 'push' main view controller } else { // 'push' login view

Which is the proper delegate to implement when an application is waking up from being in the background and you want it to prep it to be active? applicationWillEnterForeground vs applicationDidBecomeActive -- What's the difference? Which is the proper delegate to implement for when an application is going to sleep and you want to prep it to cleanup and save data? applicationWillResignActive vs. applicationDidEnterBackground -- What's the difference? Also, I've noticed that applicationWillResignActive gets called when an incoming SMS or call comes in but the user chooses to click Ok and

How do people deal with a scheduled NSTimer when an app is in the background? Let's say I update something in my app every hour. updateTimer = [NSTimer scheduledTimerWithTimeInterval:60.0*60.0 target:self selector:@selector(updateStuff) userInfo:nil repeats:YES]; When in the background, this timer obviously doesn't fire(?). What should happen when the user comes back to the app..? Is the timer still running, with the same times? And what would would happen if the user comes back in over an hour. Will it trigger for all the times that it missed, or will it wait till the next update time? What I

Is it possible to know if the app was launched/opened from a push notification? I guess the launching event can be caught here: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { if (launchOptions != nil) { // Launched from push notification NSDictionary *notification = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey]; } } However, how can I detect it was opened from a push notification when the app was in background? shanegao See This code : - (void)application:(UIApplication *)application