blocks|key|568885|text|您只需要在AppDelegate中创建一个函数，并在注销时调用该函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|568886|例如(Obj-C版本)|568887|-+(void)+setCurrentRootController+:+(UIViewController+*)viewController+{

++++[[[UIApplication+sharedApplication].delegate+window]+setRootViewController:nil];
++++UINavigationController+*navigation+=+[[UINavigationController+alloc]initWithRootViewController:viewController];
++++[[[UIApplication+sharedApplication].delegate+window]+setRootViewController:navigation];
}|code-block|syntax|javascript|568888|注销时，只需要设置rootViewController，然后调用popToRootViewController方法即可。|568889|希望这对你有用!！|568890|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You just need to make a function in AppDelegate and call that function on logout.

eg.(Obj-C Version)

<pre><code>- (void) setCurrentRootController : (UIViewController *)viewController {

 [[[UIApplication sharedApplication].delegate window] setRootViewController:nil];
 UINavigationController *navigation = [[UINavigationController alloc]initWithRootViewController:viewController];
 [[[UIApplication sharedApplication].delegate window] setRootViewController:navigation];
}
</code></pre>

When you are doing logout you just need to set rootViewController and then call popToRootViewController method.

Hope this will work for you !!

blocks|key|3715746|text|你不需要使用任何额外的技术来在运行时设置rootViewController，除了以下几点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3715747|UIApplication.sharedApplication().keyWindow?.rootViewController+=+viewController;|code-block|syntax|javascript|3715748|如果你愿意，你可以用动画来包装它|3715749|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You don't need to use any additional technics to set rootViewController in runtime except following:

<pre><code>UIApplication.sharedApplication().keyWindow?.rootViewController = viewController;
</code></pre>

You can wrap this with animation if you want

blocks|key|3715770|text|在Swift中，您可以这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3715771|let+vc:+UIViewController!+=+self.storyboard!.instantiateViewControllerWithIdentifier("LoginViewController")

++++let+window+=+UIApplication.sharedApplication().windows[0];
++++window.rootViewController+=+vc;|code-block|syntax|javascript|3715772|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Swift You can do like this 

<pre><code>let vc: UIViewController! = self.storyboard!.instantiateViewControllerWithIdentifier("LoginViewController")

 let window = UIApplication.sharedApplication().windows[0];
 window.rootViewController = vc;
</code></pre>

blocks|key|5828876|text|对于注销，执行以下操作：-(在调用注销的IBAction或didSelect+..etc方法中添加以下代码)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5828877|//+Making+Login+as+rootViewController+as+user+is+no+longer+logged+in
++++NSUserDefaults.standardUserDefaults().setBool(false,+forKey:+"isUserLoggedIn")
++++++++++++++++NSUserDefaults.standardUserDefaults().synchronize()


++++++++++++++++let+loginVC+=+self.storyboard?.instantiateViewControllerWithIdentifier("Login")+as!+loginViewController

++++++++++++++++let+appDel:AppDelegate+=+UIApplication.sharedApplication().delegate+as!+AppDelegate

++++++++++++++++appDel.window?.rootViewController+=+loginVC|code-block|syntax|javascript|5828878|另外，在AppDelegate中添加以下内容：|5828879|//+Checking+user+login+status,+if+user+already+logged+in+then+making+main+tab+bar+view+controller+as+root+view+controller+
+++++++++++let+userLoginStatus+=+NSUserDefaults.standardUserDefaults().boolForKey("isUserLoggedIn")

++++++++++++if(userLoginStatus)
++++++++++++{

++++++++++++++++let+mainStoryBoard:+UIStoryboard+=+UIStoryboard(name:+"Main",+bundle:+nil)
+++++++++++++++++++let+centerVC+=+mainStoryBoard.instantiateViewControllerWithIdentifier("MainTabBar")+as!+ViewController
++++++++++++window!.rootViewController+=+centerVC
++++++++++++window!.makeKeyAndVisible()
++++++++++++}|5828880|在验证用户凭据之后，还要在哪里进行登录验证：-|5828881|+@IBAction+func+loginTapped(sender:+AnyObject)+{

++++++++let+appDel:AppDelegate+=+UIApplication.sharedApplication().delegate+as!+AppDelegate
+++let+mainStoryBoard:+UIStoryboard+=+UIStoryboard(name:+"Main",+bundle:+nil)
++++++++let+centerVC+=+mainStoryBoard.instantiateViewControllerWithIdentifier("MainTabBar")+as!+ViewController
//+Important+to+set+status+to+true
+NSUserDefaults.standardUserDefaults().setBool(true,+forKey:+"isUserLoggedIn")
++++++++NSUserDefaults.standardUserDefaults().synchronize()
appDel.window!.rootViewController+=+centerVC
++++++++appDel.window!.makeKeyAndVisible()
}|5828882|备注：-不要忘记为所需的视图控制器添加情节提要ID，以激发它们|offset|length|style|BOLD|5828883|entityMap^0|0|0|0|0|0|0|0|4|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@$Q|13|R|14|S|T]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

For Logout do following:- (Add below code inside IBAction or didSelect ..etc method where logout is called)

<pre><code>// Making Login as rootViewController as user is no longer logged in
 NSUserDefaults.standardUserDefaults().setBool(false, forKey: "isUserLoggedIn")
 NSUserDefaults.standardUserDefaults().synchronize()


 let loginVC = self.storyboard?.instantiateViewControllerWithIdentifier("Login") as! loginViewController

 let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

 appDel.window?.rootViewController = loginVC
</code></pre>

Also add following in AppDelegate:-

<pre><code>// Checking user login status, if user already logged in then making main tab bar view controller as root view controller 
 let userLoginStatus = NSUserDefaults.standardUserDefaults().boolForKey("isUserLoggedIn")

 if(userLoginStatus)
 {

 let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
 let centerVC = mainStoryBoard.instantiateViewControllerWithIdentifier("MainTabBar") as! ViewController
 window!.rootViewController = centerVC
 window!.makeKeyAndVisible()
 }
</code></pre>

And Also where login Validation is done, after validating user credentials:-

<pre><code> @IBAction func loginTapped(sender: AnyObject) {

 let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
 let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
 let centerVC = mainStoryBoard.instantiateViewControllerWithIdentifier("MainTabBar") as! ViewController
// Important to set status to true
 NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isUserLoggedIn")
 NSUserDefaults.standardUserDefaults().synchronize()
appDel.window!.rootViewController = centerVC
 appDel.window!.makeKeyAndVisible()
}
</code></pre>

NOTE:- Don't forget to add STORYBOARD IDs for required View Controllers to instiantiate them

blocks|key|568919|text|您可以维护两个窗口，一个用于登录，另一个用于通过身份验证的用户。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|568920|这样你就可以很容易地切换btw窗口，而不是有一个混乱的MVC。|568921|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You can maintain two windows, one is for login, and second one for the users who got authenticated.

This way you can easily switch btw windows rather than having a messy MVC for it.

blocks|key|560663|text|警告，如果您使用委托或完成方法，请确保您在主线程中是。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|560664|Swift+3中的代码|560665|DispatchQueue.main.async+{
++++++++guard+let+tb+=+self.storyboard?.instantiateViewController(withIdentifier:+"LoggedUser")+as?+UITabBarController+else+{
++++++++++++print("Could+not+instantiate+view+controller+with+identifier+of+type+LoggedUser")
++++++++++++return
++++++++}
++++++++self.present(tb,+animated:+true,+completion:+nil)}|code-block|syntax|javascript|560666|entityMap^0|0|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Warning, make sure your are in the main thread if you use Delegate or Completion methods.

Code in Swift 3

<pre><code>DispatchQueue.main.async {
 guard let tb = self.storyboard?.instantiateViewController(withIdentifier: "LoggedUser") as? UITabBarController else {
 print("Could not instantiate view controller with identifier of type LoggedUser")
 return
 }
 self.present(tb, animated: true, completion: nil)}
</code></pre>

<a href="https://i.stack.imgur.com/IxbJi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IxbJi.png" alt="enter image description here"></a>

my storyboard 

If user doesn't login, the rootViewController is <code>Login</code>

after user login done, rootViewController is MainTabBarController

I have done that 

But, I have encounter question is <code>Logout</code>

My <code>Logout</code> is dismissViewController

If my rootViewController is <code>Login</code>, it works

It will remove current ViewController, so <code>Login</code> appear

But when my rootViewController is <code>MainTabBarController</code>, dismiss is not work, I've try using <code>poptoRootViewController</code> in vain.

what should I do in <code>Logout</code> ?

I want to do like this

<pre><code>dismissController(true,{
 rootViewController = `Login`
})
</code></pre>

iOS how to change rootViewController when dismissController

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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​​我的故事板如果用户未登录，则rootViewController为Login用户登录完成后，rootViewController为MainTabBarController我已经做到了但是，我遇到的问题是Logout我的Logout是dismissViewController如果我的rootViewControlle...

问iOS当使用dismissController时如何更改rootViewController
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问iOS当使用dismissController时如何更改rootViewControllerEN