Question

我正在尝试创建一个类来处理我项目中的所有登录服务。除了谷歌登录外，一切都运行良好。

我希望在Google文档中提到的不是在UIVIewController中实现Google登录，您可以使用GIDSignInDelegate执行此操作，并在您的类不是UIViewController时使用它。

我的课程已从NSObject延长，并希望在该服务上处理Google SignIn，之后我只想调用一种方法来执行此操作。

var ls: LoginService = LoginService.instance
 ls.doGoogleLogin()

这是我的LoginService：

struct LOGIN_URL {
    static let LOGIN: String = "login"
}

protocol LoginServiceDelegate: class {
    func loginSuccess(loginResponse: User)
    func loginFailed(message: String)
}

class LoginService: NSObject, GIDSignInDelegate{

    static let instance = LoginService()

    weak var delegate: LoginServiceDelegate?

    var user: User?

    func doGoogleLogin(){
        var configureError: NSError?
        GGLContext.sharedInstance().configureWithError(&configureError)
        assert(configureError == nil, "Error configuring Google services: \(configureError)")

        GIDSignIn.sharedInstance().delegate = self
//        GIDSignIn.sharedInstance().uiDelegate = self

        GIDSignIn.sharedInstance().signIn()
    }

    public func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        print(user.profile.email)
    }

    func signIn(signIn: GIDSignIn!,
                presentViewController viewController: UIViewController!) {
        self.presentViewController(viewController, animated: true, completion: nil)
    }

    func signIn(signIn: GIDSignIn!,
                dismissViewController viewController: UIViewController!) {
        self.dismissViewControllerAnimated(true, completion: nil)
    }
}

当我使用此代码时出现错误 value of type LoginService has no member presentViewController

这里应该做什么不会出现此错误？

Answer 1

通过键入self.presentViewController，您说self引用的类是可以使用方法presentViewController的对象类型。在这种情况下，当您说self时，您正在引用LoginService实例。 LoginService继承自NSObject，这意味着它不是可以调用该方法的View Controller或Navigation Controller对象。

我认为您需要在LoginService类的顶部添加委托方法。

protocol LoginServiceDelegate: class {
  func loginSuccess(loginResponse: User)
  func loginFailed(message: String)
  func googleSignInLaunch(_ viewController: UIViewController)
  func googleSignInDismiss(_ viewController: UIViewController)
}

然后当你打电话：

func signIn(signIn: GIDSignIn!, presentViewController viewController: UIViewController!) {
    //call delegate method here
    //which will trigger view controller calling this to launch something
    delegate?.googleSignInLaunch(_ viewController: UIViewController)
}

func signIn(signIn: GIDSignIn!,
            dismissViewController viewController: UIViewController!) {
    delegate?.googleSignInDismiss(_ viewController: UIViewController)
}

然后在View Controller中调用您的登录服务：

class MyViewController: UIViewController {

  let loginService = LoginService()

  override func viewDidLoad() {
    loginService.delegate = self
    loginService.doGoogleLogin()
  }

  func googleSignInLaunch(_ viewController: UIViewController) {
    self.presentViewController(viewController, animated: true, completion: nil)
  }

  func googleSignInDismiss(_ viewController: UIViewController) {
    self.dismissViewControllerAnimated(true, completion: nil)
  }

  //the methods below are the other two methods that were in your LoginService protocol

  func loginSuccess(loginResponse: User) {
    //whatever you need to do
  }

  func loginFailed(message: String) {
    //whatever you need to do
  }

}

Answer 2

您的LoginService课程不是UIViewController，因此正在运行presentViewController无效。尝试使用以下代码获取最顶层的ViewController，并在该ViewController上调用presentViewController。

if var topController = UIApplication.shared().keyWindow?.rootViewController {
    while let presentedViewController = topController.presentedViewController {
        topController = presentedViewController
    }

    // Call presentViewController on topController
}

Google登录不在UIVIewController中

2 个答案: