在viewDidLoad Swift之前更改初始视图

Question

我使用Xcode Swift 7和2。 我想知道如何在viewDidLoad我的初始视图之前执行一个动作。 实际上我想根据参数更改初始视图（如果我已登录或未登录）... 我们应该在AppDelegate中做到吗？ 谢谢

Answer 1

这样你就可以从appdelegate启动特定的viewController：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let initialViewController = storyboard.instantiateViewControllerWithIdentifier("yourID")

    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()

    return true
}

以这种方式分配您的故事板ID：

点击你的故事板，然后转到右侧的Identity Inspector，并提供一个故事板ID，如下图所示：

Answer 2

let mainStorybord : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        
    Bool isAlreadyLogin =  <...code for to check for already logged in or not...>
        if  isAlreadyLogin
        {
    var homeVC = storyboard.instantiateViewControllerWithIdentifier("<homeVC>") as! UIViewController
    // HERE <homeVC> will be your identifier  for your sugue in storyboard for initial view after login.
            let nav : UINavigationController =  UINavigationController(rootViewController: homeVc)
            self.window?.rootViewController = nav
        }
        else
        {
    var loginVC = storyboard.instantiateViewControllerWithIdentifier("<loginVC>") as! UIViewController
    // HERE <loginVC> will be your identifier  for your sugue in storyboard for login view

            let nav : NavigationViewController = UINavigationController(rootViewController: loginVC)
            self.window?.rootViewController = nav
        }
    self.window?.makeKeyAndVisible()