Different views for Different iPhone sizes

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

     UIStoryboard *storyboard = [self grabStoryboard];

    self.window.rootViewController = [storyboard instantiateInitialViewController];

    [self.window makeKeyAndVisible];

    return YES;

}

- (UIStoryboard *)grabStoryboard {

    

    // determine screen size

    int screenHeight = [UIScreen mainScreen].bounds.size.height;

    UIStoryboard *storyboard;

    

    switch (screenHeight) {

            

            // iPhone 5s

        case 568:

            storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

            break;

            

            // iPhone 6

        case 667:

            storyboard = [UIStoryboard storyboardWithName:@"Main6" bundle:nil];

            break;

            

            // iPhone 6 Plus

        case 736:

            storyboard = [UIStoryboard storyboardWithName:@"Main6s" bundle:nil];

            break;

            

        default:

            // it's an iPad

            storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

            break;

    }

    

    return storyboard;

}