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 Google 登录外，一切正常。

我想在 UIVIewController 中实现 Google 登录，如 Google 文档中所述，您可以使用 GIDSignInDelegate 实现此目的，并在您的类不是 UIViewController 时使用它。

我的类是从 NSObject 扩展而来的，并希望在该服务上处理 Google SignIn，之后我只想调用一个方法来执行此操作。

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

这是我的登录服务:

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)
    }
}

当我使用这段代码时出现错误 LoginService 类型的值没有成员 presentViewController

这里应该怎么做才不会报错？

最佳答案

通过键入 self.presentViewController，您是说 self 引用的类是一个可以使用方法 presentViewController 的对象类型.在这种情况下，当您说 self 时，您引用的是 LoginService 实例。 LoginService 继承自 NSObject，这意味着它不是一个对象 - 如 View Controller 或 Navigation Controller 可以调用该方法。

我认为您需要在 LoginService 类的顶部添加委托(delegate)方法。

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

然后当你打电话时:

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
  }

}

关于ios - Google 登录不在 UIVIewController 中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41021304/