Calling view controller method from app delegate

Question

I'm trying to call a method in the view controller from the app delegate, but Xcode says No known class method for selector 'myMethodHere'. Here's my code:

AppDelegate.m:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [..]
            [MainViewController myMethodHere];
    [..]
    return YES;
}

MainViewController.m:

-(void) myMethodHere {
     [..]
}

Answer 1

In Swift, you can write it like this

    UIApplication.sharedApplication().keyWindow?.rootViewController?.yourMethodName()

Answer 2

If you want to access to a view controller on a story board, you may use this block of code from the AppDelegate:

MainViewController *rootViewController = (MainViewController*)self.window.rootViewController;
[rootViewController aMethod];

Remember to add the import.

Answer 3

I would try

MainViewController * vc = [[MainViewController alloc]init];
[vc myMethodHere];
[vc release];

1. Make sure to import your MainViewController in your app delegate .m file
2. make sure you add "myMethodHere" to your MainViewController .h file