Btukfyl

What steps do I need to do? In Objective-C we created a rootViewController and detailViewController, after there added this controllers to splitViewController. For example:

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

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    self.window.backgroundColor = [UIColor whiteColor];

    UISplitViewController *splitViewController = [[UISplitViewController alloc] init];

    MTTRootViewController *rootViewController = [[MTTRootViewController alloc] init];

    MTTDetailedViewController *detailedViewController = [[MTTDetailedViewController alloc]init];

    splitViewController.viewControllers = [NSArray arrayWithObjects:rootViewController, detailedViewController, nil];

    [self.window setRootViewController:(UIViewController*)splitViewController];

    [self.window makeKeyAndVisible];

    return YES;

}

How can I do the same in Swift?

if you want do it with navigationController, then try it:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

    self.window!.backgroundColor = UIColor.whiteColor()

    var splitViewController =  UISplitViewController()

    var rootViewController = RootViewController()

    var detailViewController = DetailViewController()

    var rootNavigationController = UINavigationController(rootViewController:rootViewController)

    var detailNavigationController = UINavigationController(rootViewController:detailViewController)

    splitViewController.viewControllers = [rootNavigationController,detailNavigationController]

    self.window!.rootViewController = splitViewController

    self.window!.makeKeyAndVisible()

    return true

}

After some time I found answer:

At first time need create rootViewController and detailViewController. For example, rootViewController will be inherit from UITableViewController and detailViewController will inherit from UIViewController.
At next time you will need do this:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

        self.window!.backgroundColor = UIColor.whiteColor()

        var splitViewController =  UISplitViewController()

        var rootViewController = RootViewController()

        var detailViewController = DetailViewController()

        splitViewController.viewControllers = [rootViewController,detailViewController]

        self.window!.rootViewController = splitViewController

        self.window!.makeKeyAndVisible()

        return true

    }