FirebaseAuthUI IOS - 如何添加登录屏幕背景图片？

Question

我想在登录屏幕的登录按钮后添加一个图像。目前，我得到了以下错误消息：

终止应用程序由于未捕获的异常“NSInternalInconsistencyException”，理由是：“在包无法加载NIB：”一个NSBundle < ...>与名称...

这里我的代码：

在AppDelegate中：

class AppDelegate: UIResponder, UIApplicationDelegate { 

    var window: UIWindow? 
    var authHandle: AuthStateDidChangeListenerHandle? 
    var userInfo:User! 

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 
     // Override point for customization after application launch. 
     FirebaseApp.configure() 

     //checkLoggedIn 
     authHandle = Auth.auth().addStateDidChangeListener { auth, user in 
      if let user = user { 
       self.userInfo = user 
      } else { 
       // No user is signed in. 
       self.login() 
      } 
     } 

     return true 
    } 

func login() { 
     let authUI = FUIAuth.defaultAuthUI() 
     authUI?.delegate = self as? FUIAuthDelegate 

     let providers: [FUIAuthProvider] = [ 
      FUIFacebookAuth() 
     ] 
     authUI?.providers = providers 

     // Present the auth view controller and then implement the sign in callback. 
     let authViewController = CustomAuthViewController(authUI: authUI!) 
     self.window?.rootViewController?.present(authViewController, animated: false, completion: nil) 
    } 

    func authPickerViewController(for authUI: FUIAuth) -> FUIAuthPickerViewController { 
     return CustomAuthViewController(nibName: "CustomAuthViewController", 
             bundle: Bundle.main, 
             authUI: authUI) 
    } 
} 

在CustomAuthViewController：

class CustomAuthViewController: FUIAuthPickerViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     // Do any additional setup after loading the view. 

     let width = UIScreen.main.bounds.size.width 
     let height = UIScreen.main.bounds.size.height 

     let imageViewBackground = UIImageView(frame: CGRect(x: 0, y: 0, width: width, height: height)) 
     imageViewBackground.image = UIImage(named: "myimage") 

     // you can change the content mode: 
     imageViewBackground.contentMode = UIViewContentMode.scaleToFill 

     view.insertSubview(imageViewBackground, at: 0) 
    } 

你看到有什么问题吗？我不确定authPickerViewController函数应该在我的AppDelegate中，你能确认它没问题吗？我发现this后和this one但我不能让它工作。 我使用Firebase-UI 4.1.1，我的登录流程没有背景图片（所以没有CustomPickerViewController）。

谢谢

亚历

Answer 1

这就是我的个性覆盖的样子：

import UIKit 
import FirebaseAuthUI 

class BizzyAuthViewController: FUIAuthPickerViewController { 


    override init(nibName: String?, bundle: Bundle?, authUI: FUIAuth) { 
     super.init(nibName: "FUIAuthPickerViewController", bundle: bundle, authUI: authUI) 
    } 

    required init?(coder aDecoder: NSCoder) { 
     super.init(coder: aDecoder) 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     // Do any additional setup after loading the view. 

     let width = UIScreen.main.bounds.size.width 
     let height = UIScreen.main.bounds.size.height 

     let imageViewBackground = UIImageView(frame: CGRect(x: 0, y: 0, width: width, height: height)) 
     imageViewBackground.image = UIImage(named: "lavenderWithBees") 

     // you can change the content mode: 
     imageViewBackground.contentMode = UIViewContentMode.scaleAspectFill 

     view.insertSubview(imageViewBackground, at: 0) 

    } 

} 

而这正是我的登录功能（ “ViewController.swift” 内）是这样的：

func login() { 

    //FirebaseApp.configure() 
    let authUI = FUIAuth.defaultAuthUI() 
    let providers: [FUIAuthProvider] = [FUIGoogleAuth(), FUIFacebookAuth()] 
    authUI?.providers = providers 
    authUI?.delegate = self as FUIAuthDelegate 

    let authViewController = BizzyAuthViewController(authUI: authUI!) 
    let navc = UINavigationController(rootViewController: authViewController) 
    self.present(navc, animated: true, completion: nil) 

}