从 AppDelegate 加载标签栏控制器

Question

I have been trying to figure this out by myself, but couldn't.

I want to load a Tab Bar controller from my AppDelegate (After a successful Google Sign in to the application).

I read here how to load a ViewController from AppDelegate

Perform Segue from App Delegate swift

Code in the example:

// Access the storyboard and fetch an instance of the view controller
let storyboard = UIStoryboard(name: "Main", bundle: nil);
let viewController: MainViewController = storyboard.instantiateViewController(withIdentifier: "ViewController") as! MainViewController;

// Then push that view controller onto the navigation stack
let rootViewController = self.window!.rootViewController as! UINavigationController;
rootViewController.pushViewController(viewController, animated: true);

In this example, my TabBar needs both a name and identifier, from what I understood.

Can someone please explain this to me ? I can't find "identifier" on the Tab Bar Controller , only "Title".

Also, I don't have a navigation controller view in my app.

Answer 1

set storyboard ID here

and embed the firstViewController in IB in navigationController

 let rootViewController = self.window!.rootViewController as! UINavigationController;
 rootViewController.pushViewController(viewController, animated: true);

Answer 2

iOS 13 Update

From version. iOS 13, The RootViewController will be initiated in scene function located at SceneDelegate.swift instead of AppDelegate.swift file. which looks like this.

Example:

         // Simple init
        let mainSB: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let loggedInTabController = mainSB.instantiateViewController(identifier: "loggedInTabController")
        self.window!.rootViewController = loggedInTabController