无法从应用程序委托调用View Controller方法

Question

I'm trying to build the sample app from facebook iOS SDK but I'm using storyboards so it's a little different.

I'm doing this check in my AppDelegate.m application didFinishLaunchingWithOptions:

 if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded) {
    // To-do, show logged in view
} else {
    // No, display the login page.
    [self showLoginView];
}

return YES;

I've created a segue from my main ViewController to a navigation controller. The segue works fine if I trigger it using a button in my ViewController view, but I can't call that method from my AppDelegate .

The name of the method(that performs the segue) is -displayLoginView but I can´t find a way to point to the particular instance of my ViewController that is active at launch.

Any ideas?

Answer 1

Your UIApplicationDelegate is not a view controller so it cannot initiate any segues.

You probably want to call self.window.rootViewController to get the viewcontroller in question but it might be easier to put that code in your viewController 's viewDidAppear or viewWillAppear method instead of the app delegate.