iOS: Xcode: How do I switch a view upon launch

I have an iOS application where I'm looking to see if a user has registered yet.  If the user has registered, I want the view to change from the main view to the homepage view upon launch.  Right now, I can't seem to figure out how to check which view is the firstResponder.  Any ideas?
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Deepak LakkadCommented:

First of all you have to use your "HomePage" as main view (First Responder).

And In "didFinishLaunchingWithOptions", method check if user is not registered then show "Registration" screen.

Here are some code.

In didFinishLaunchingWithOptions method,

self.window.rootViewController = "Your HomePage"
[self.window makeKeyAndVisible];

if(some condition to check whether user is registered or not) {
        // If not Registered
        [self showRegistrationView];

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Write a function to show Registration page as below:
- (void)showRegistrationView {
    UIViewController *topViewController = self.window.rootViewController;
    UIViewController *modalViewController = [topViewController modalViewController];
    if (![modalViewController isKindOfClass:[HomeViewController class]]) {
        HomeViewController* homeVC = [[HomeViewController alloc] initWithNibName:@"HomeViewController"
        UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:homeVC];
        [topViewController presentModalViewController:navController

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The sample code is written from one of my Application.

You have to make correction for your need.

- Deepak Lakkad

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