Ios 在 appdelegate 中设置初始视图控制器 swift

Xcode11和SceneDelegate注意:

从Xcode11开始，由于SceneDelegates，您很可能不应该在AppDelegate中执行该操作.取而代之的是从SceneDelegate开始.有关这方面的更多信息，请参阅this other answer

旧答案:

我用这个线索帮助我把目标C转换成了SWIFT，它工作得很好.

Instantiate and Present a viewController in Swift个

100代码:

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("LoginSignupVC")
    
    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()
    
    return true
}

100代码:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    self.window = UIWindow(frame: UIScreen.main.bounds)

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    
    let initialViewController = storyboard.instantiateViewController(withIdentifier: "LoginSignupVC")

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

    return true
}