如何设置根视图控制器？

Question

I want to make slide out menu. For this I have to create UINavigationViewController which will control MenuViewController (Table View) and ProfileViewControlle r(Content View)

I want to set UINavigationViewController like a rootViewController , for this I wrote this code in AppDelegate.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

let nav1 = UINavigationController()
        let mainView = MainViewController(menuViewController: nil, contentViewController: nil) //ViewController = Name of your controller
        nav1.viewControllers = [mainView]
self.window?.rootViewController = nav1

        self.window?.makeKeyAndVisible()

        return true
    }

MainViewController is my UINavigationViewController .

But here I have error

nil is not compatible with expected argument type 'UIViewController'

What I should do?

Answer 1

1. You pass nil here: MainViewController(menuViewController: nil, contentViewController: nil) instead of some view controllers. That's probably the reason it doesn't compile.

2. You embed your MainViewController instance, which is already UINavigationController, into another one UINavigationController. That looks wrong too.

Answer 2

Here is an example:

LoginViewController *loginController = [[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"loginController"]; //or the homeController
UINavigationController *navController = [[UINavigationController alloc]initWithRootViewController:loginController];
self.window.rootViewController = navController;`

Answer 3

此错误意味着您不能将menuViewController和contentViewController设置为nil ，它们不是可选的