iOS - Using a different storyboard for each device type

gistfile1.m

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

// Whatever needs to happen before 

UIStoryboard *storyboard;
BOOL isIphone = ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)? TRUE : FALSE;
 
if(isIphone) {
 	//iPhone Family
 	CGSize deviceScreenSize = [[UIScreen mainScreen] bounds].size;
 	switch ((int) deviceScreenSize.height) {
 		case 568:
			// iPhone 5 and 5S
			storyboard = [UIStoryboard storyboardWithName:@"iPhone5" bundle:nil];
		break;
		case 750:
			// iPhone 6
			storyboard = [UIStoryboard storyboardWithName:@"iPhone6" bundle:nil];
		break;
		case 1080:
			// iPhone 6 Plus
			storyboard = [UIStoryboard storyboardWithName:@"iPhone6Plus" bundle:nil];
		break;
		default:
			// Older iPhones
		 	storyboard = [UIStoryboard storyboardWithName:@"iPhone" bundle:nil];
		break;
 	}
}
else {
	//iPad Family
	storyboard = [UIStoryboard storyboardWithName:@"iPad" bundle:nil];
}
 
// Instantiate the initial view controller object from the storyboard
UIViewController *initialViewController = [storyboard instantiateInitialViewController];

// Instantiate a UIWindow object and initialize it with the screen size of the iOS device
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
 
// Set the initial view controller to be the root view controller of the window object
self.window.rootViewController = initialViewController;
 
// Set the window object to be the key window and show it
[self.window makeKeyAndVisible];

}