Gmail身份验证未返回应用程序

问题:

警告告诉您application(_:open:options:)无法找到实施:

2017-01-09 09:47:53.702 Dog_Log[3922:]  Implementation of application:openURL:sourceApplication:annotation: not found. Please add the handler into your App Delegate. Class: Dog_Log.AppDelegate

解:

您可能忘记了application(_:open:options:)要实现的方法,通过调用handle(_:sourceApplication:annotation:)它来处理重定向到您的应用程序.你AppDelegate.swift应该看起来像这样(提示在代码注释中):

import UIKit
import Firebase
import GoogleSignIn

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  var window: UIWindow?


  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    // configure firebase
    FIRApp.configure()

    // configure google
    GIDSignIn.sharedInstance().clientID = FIRApp.defaultApp()?.options.clientID

    return true
  }

  func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

    // handled to go back to application after google log in
    let handled = GIDSignIn.sharedInstance().handle(url, sourceApplication:options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String, annotation: [:])

    return handled
  }

  // other methods
}

您使用的示例ViewController符合GIDSignInUIDelegate和GIDSignInDelegate,以访问signIn方法并将其与自定义按钮的@IBAction一起使用:

import UIKit
import Firebase
import GoogleSignIn


class ViewController: UIViewController, GIDSignInUIDelegate, GIDSignInDelegate {

  override func viewDidLoad() {
    super.viewDidLoad()

    // make the view controller the delegate
    GIDSignIn.sharedInstance().uiDelegate = self
    GIDSignIn.sharedInstance().delegate = self
  }

  // your action of the button to call the signIn method
  @IBAction func pressGoogleSignInButton(_ sender: UIButton) {
    GIDSignIn.sharedInstance().signIn()
  }

  func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
    if let error = error {
      print("failed to log into google: ", error)
      return
    }

    print("successfully logged into google ", user)

    guard let idToken = user.authentication.idToken else { return }
    guard let accessToken = user.authentication.accessToken else { return }
    let credentials = FIRGoogleAuthProvider.credential(withIDToken: idToken, accessToken: accessToken)

    FIRAuth.auth()?.signIn(with: credentials, completion: { (user, error) in
      if let error = error {
        print("Faild to create a firebase user with google account: ", error)
        return
      }

      guard let uid = user?.uid else { return }
      print("Successfully logged into firebase with google ", uid)
      // redirect to the next screen after successful login

    })
  }
}