Question

我使用firebase进行身份验证。一旦用户登录，我想用Tab控制器移动到主屏幕。

App委托功能

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
{
    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    window?.makeKeyAndVisible()
    navToSignin()
    return true
}
func navToHome()
{
    print("navToHome")
    let customTab = CustomTabBar()
    window?.rootViewController = customTab
}
func navToSignin()
{
    let firstPage = SigninNewVC()
    window?.rootViewController = firstPage
}

SigninNewVC

override func viewWillAppear(animated: Bool)
{
    super.viewWillAppear(animated)

    if FIRAuth.auth()?.currentUser?.uid != nil
    {
        if let appDel = UIApplication.sharedApplication().delegate  as? AppDelegate
        {
            print("viewWillAppear")

            appDel.navToHome()
      //This func gets called but still does not navigate to Home VC
        }
    }
}

private func fbSignin(token: String)
{
    FIRAuth.auth()?.signInWithCustomToken(token) { (user, error) in

        if error == nil
        {
            if user != nil
            {
                if let appDel = UIApplication.sharedApplication().delegate as? AppDelegate
                {
                    JulehHUD.hideProgressHUD(self.view!)
                    appDel.jumpToHome()
                    //This part works fine when i login it navigates to Home Screen
                }
            }
        }
        else
        {
            print("Error:\n\(error)\n")
        }
    }
}

当我第一次登录时，它可以正常工作，我可以导航到主屏幕。但如果我重新启动应用程序我无法导航到主屏幕。它通过打印语句打印（“viewWillAppear”）和＆amp ;;保留在SigninNewVC中。 print（“navToHome”）被执行。不知道我做错了什么。以下是我的Tab栏类

class CustomTabBar：UITabBarController {

override func viewDidLoad()
{
    super.viewDidLoad()

    let homeController = HomeScreenVC()
    let newHomeTab = UINavigationController(rootViewController: homeController)
    newHomeTab.title = "Home"

    viewControllers = [newHomeTab]

}
}

请让我知道我做错了什么。

Answer 1

我认为你错误地透露了VC，你应该使用类似CustomTabBar(nibName: nil, bundle:nil)的内容并在其中添加你的子视图loadView:

Answer 2

将以下代码添加到navToHome（）＆amp; App Delegate中的navToSignin（）修复了该问题。

window = UIWindow(frame: UIScreen.mainScreen().bounds)    
window?.makeKeyAndVisible()

IOS Swift-导航到没有故事板的主屏幕

2 个答案: