Google 登录在 iOS 中显示空白屏幕

I have implemented code as per the google SDK documentation line by line in my app, but still when I click on google sign in button app shifts to new view controller with webview with blank screen. Have tried multiple solution found here : GIDSignIn white screen on iOS 9 https://stackoverflow.com/questions/35375624/gidsignin-white-screen-on-ios-9%5D1 https://i.stack.imgur.com/CiPBe.png. But no lucks with resolving the problem , have attached the screen shot for getting closer look about the screen.

以下是我正在使用的豆荚，

运行 XCode 9.1、iOS 10.0 及更高版本。请有人帮忙。

Update: View Hierarchy

更新：viewDidLoad的代码：

 GIDSignIn.sharedInstance().uiDelegate = self
    if self.isChangePassword {
        self.addSignInView()
    }
    else {
        self.addSignUpView()
    }

fileprivate func addSignInView() {
    guard let signInEmailView: SignInEmailView = Bundle.main.loadNibNamed(NibNames.SignInEmailView.rawValue, owner: self, options: nil)?[0] as? SignInEmailView
        else {
            return
    }
    signInEmailView.delegate = self
    gaManager.trackScreen(screenName: ScreenNames.SignIn.rawValue)
    self.animateView(signInEmailView)

}

fileprivate func addSignInView() {
    guard let signInEmailView: SignInEmailView = Bundle.main.loadNibNamed(NibNames.SignInEmailView.rawValue, owner: self, options: nil)?[0] as? SignInEmailView
        else {
            return
    }
    signInEmailView.delegate = self
    gaManager.trackScreen(screenName: ScreenNames.SignIn.rawValue)
    self.animateView(signInEmailView)

}

我也有同样的问题。我使用 UIAlertView 来确认用户确实想要进行授权。它将显示空白屏幕。如果我删除 UIAlertView 并直接显示授权视图。效果很好。 该问题也显示在 Dropbox 授权屏幕中。 如果您不使用 UIAlertView ，请尝试传递最顶层的控制器

https://github.com/dropbox/dropbox-sdk-obj-c/issues/182 https://github.com/dropbox/dropbox-sdk-obj-c/issues/182

希望这可以提供一些帮助。