ios - Google 登录崩溃和错误 : uiDelegate must either be a |UIViewController|

Question

我正在尝试对 iOS 应用实现 Google 登录，但该应用在点击登录按钮时崩溃并出现以下错误:

reason: 'uiDelegate must either be a |UIViewController| or implement the |signIn:presentViewController:| and |signIn:dismissViewController:| methods from |GIDSignInUIDelegate|.'

我不确定我哪里出错了。我关注了 sample code from Google's iOS github确切地。我也无法编译 Google 的示例。如果有人能指出我正确的方向，那就太好了。大多数 SO 问题都基于过时的代码。

View Controller

import UIKit
import GoogleSignIn

@objc(ViewController)

class ViewController: UIViewController, GIDSignInUIDelegate {

    // Viewcontroller buttons
    @IBOutlet weak var signInButton: GIDSignInButton!
    @IBOutlet weak var signOutButton: UIButton!
    @IBOutlet weak var disconnectButton: UIButton!
    @IBOutlet weak var statusText: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        GIDSignIn.sharedInstance().uiDelegate = self

        // Sign in automatically
        GIDSignIn.sharedInstance().signInSilently()

        // Something to do with notifications
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(ViewController.receiveToggleAuthUINotification(_:)),
                                               name: NSNotification.Name(rawValue: "ToggleAuthUINotification"),
                                               object: nil)

        statusText.text = "Initialized Swift App..."
        toggleAuthUi()
    }

    // Sign out tapped
    @IBAction func didTapDisconnect(_ sender: AnyObject) {
        GIDSignIn.sharedInstance().disconnect()
        statusText.text = "Disconnecting"
    }

    // Toggle auth
    func toggleAuthUi() {
        if GIDSignIn.sharedInstance().hasAuthInKeychain() {
            signInButton.isHidden = true
            signOutButton.isHidden = false
            disconnectButton.isHidden = false
        } else {
            signInButton.isHidden = false
            signOutButton.isHidden = true
            disconnectButton.isHidden = true
        }
    }

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return UIStatusBarStyle.lightContent
    }

    deinit {
        NotificationCenter.default.removeObserver(self,
                                                  name: NSNotification.Name(rawValue: "ToggleAuthUINotification"),
                                                  object: nil)
    }

    @objc func receiveToggleAuthUINotification(_ notification: NSNotification) {
        if notification.name.rawValue == "ToggleAuthUINotification" {
            self.toggleAuthUi()
            if notification.userInfo != nil {
                guard let userInfo = notification.userInfo as? [String:String] else {return}
                self.statusText.text = userInfo["statusText"]!
            }
        }
    }
}

应用委托(delegate):

import UIKit
import GoogleSignIn

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {

    var window: UIWindow?

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

        // Init Sign in
        GIDSignIn.sharedInstance().clientID = "XXXXXXXXX"
        GIDSignIn.sharedInstance().delegate = self

        return true
    }

    // Open URL
    func application (_app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey: Any]) -> Bool {
        return GIDSignIn.sharedInstance().handle(url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String, annotation: options[UIApplicationOpenURLOptionsKey.annotation])
    }

    public func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        if let error = error {
            print("\(error.localizedDescription)")
            NotificationCenter.default.post(
                name: Notification.Name(rawValue: "ToggleAuthUINotificiation"), object: nil, userInfo: nil)
        } else {
            // User Stuff
            let userID = user.userID
            let idToken = user.authentication.idToken
            let fullName = user.profile.name
            let givenName = user.profile.givenName
            let familyName = user.profile.familyName
            let email = user.profile.email

            NotificationCenter.default.post(
                name: Notification.Name(rawValue: "ToggleAuthUINotification"),
                object: nil,
                userInfo: ["statusText": "Signed in user:\n\(fullName)"])
        }
    }

    public func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {
        // Disconnect the user
        NotificationCenter.default.post(
            name: Notification.Name(rawValue: "ToggleAuthUINotification"),
            object: nil,
            userInfo: ["statusText": "User has disconnect."])
    }

}

Answer 1

tl;dr:如果使用非 UIViewController 作为 uiDelegate - 检查 Xcode 是否警告您“实例方法 [...]匹配可选要求 [...]”并使用 Fix-Its。确保您的函数与所需的签名完全匹配。

---

按照示例代码，我遇到了同样的错误。

在我的例子中，设置有点不同，所以我不确定我的解决方案是否适用于你的问题 - 但因为这个 StackOverflow 答案显示在谷歌搜索中，我想我会在这里为任何人提供我的解决方案绊倒它:

我需要一个非 UIVIewController 子类作为 Google 登录 uiDelegate。作为文档和错误状态，这意味着您需要实现一些方法。我已经实现了它们，所以出现崩溃很奇怪。

在我的案例中，问题是来自 Google 文档的复制粘贴代码与 Swift 函数签名不完全匹配。事实上，我在 Xcode 中收到警告，说“实例方法 [...] 几乎匹配可选要求 [...]”。我使用了 Xcode 的自动 Fix-Its(它是诸如 Error 而不是 NSError 或函数参数之前的 _ 之类的东西。)

然后一切正常。