Does not show lockscreen unless called in - (void)viewDidAppear:(BOOL)animated

I have tried calling [[LTHPasscodeViewController sharedUser] showLockscreen]; over and over again in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions and viewDidLoad, wont show. Put it in viewDidAppear and it works. I use storyboards, maybe that has to do with it
