Question

我尝试在iOS应用中实施Google登录，但点击登录按钮后应用崩溃，出现以下错误：

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

我不知道我哪里出错了。我完全按照sample code from Google's iOS github。我也无法获得Google的样本进行编译。如果有人能指出我正确的方向，那将是伟大的。大多数SO问题都基于过时的代码。

的viewController

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"]!
            }
        }
    }
}

的AppDelegate：

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 - 请检查Xcode是否警告您＆＃34; 实例方法[...]几乎匹配可选要求[...] ＆＃34;并使用Fix-It。确保您的功能完全符合所需的签名。

遵循示例代码后我遇到了同样的错误。

在我的情况下，设置有点不同，所以我不确定我的解决方案是否适用于您的问题 - 但是因为这个StackOverflow答案显示在Google搜索中，我想我会在此提供我的解决方案任何人都磕磕绊绊：

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，所以事情崩溃很奇怪。

就我而言，问题在于Google的文档中的复制粘贴代码与Swift功能签名并不完全匹配。事实上，我在Xcode中有警告，说＆＃34; 实例方法[...]几乎匹配可选要求[...] ＆＃34;。我使用了Xcode的自动修复功能（在Error之类的东西，而不是NSError或_之前的函数的参数。）

然后一切正常。

谷歌登录崩溃＆amp;错误：uiDelegate必须是| UIViewController |

1 个答案: