Question

Is their any Possibilty to Check which viewController is running in IPhone application Programmatically in Appdelegate

Answer 1

There is no easy answer to this. You need to walk the view controller hierarchy starting with the main window’s root view controller. If you encounter a UINavigationController you need to look at the topViewController. Once you get to a UIViewController, you need to look at the modalViewController, if any. If you have any tab bar controllers then you need to look at the currently selected tab.

Things like UISplitViewController complicates things since this can show two view controllers at once.

Here is the start of a category method you could add to UIViewController. This only handles regular view controllers and navigation controllers.

- (UIViewController *)topMostController {
    if (self.modalViewController) {
        return [self.modalViewController topMostController];
    } else {
        if ([self isKindOfClass:[UINavigationController class]]) {
            UINavigationController *nc = (UINavigationController *)self;

            return [nc.topViewController topMostController];
        } else {
            return self;
        }
    }
}

Call this from your app delegate on the key window’s rootViewController.