ios - iOS在dismissController时如何更改rootViewController

我的故事板

如果用户未登录，则rootViewController为Login
用户登录完成后，rootViewController是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rootViewController是Login，那么它可以工作

它将删除当前的ViewController，因此出现Login
但是当我的rootViewController是MainTabBarController时，dismiss不起作用，我尝试徒然使用poptoRootViewController。

我应该在Logout中做什么？

我想这样

dismissController(true,{
   rootViewController = `Login`
})

最佳答案

对于注销，请执行以下操作:-(在IBAction或调用注销的didSelect ..etc方法中添加以下代码)

// 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

还可以在AppDelegate中添加以下内容:

// 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()
            }

还有在验证用户凭据后完成登录验证的位置:-

 @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()
}

注:-不要忘记为所需的View Controller添加STORYBOARD ID来实例化它们

关于ios - iOS在dismissController时如何更改rootViewController，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37782001/