Swift3 无法分配类型为'；（UIViewController？，n错误？）->；无效'；输入'；（（UIViewController？，错误？->；无效）'；

我有这个功能来验证播放器，它在xcode8 beta 6之前运行良好：

 func authenticateLocalPlayer()
{
    print(#function)
    // WillSignIn
    self.delegate?.willSignIn?()

    // The player authenticates in an asynchronous way, so we need a notification to inform when the authentication was completed successfully
    // If the local player is already connected, return and notificate
    if GameKitHelper.sharedGameKitHelper.localPlayer.isAuthenticated {
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: Constants.LocalPlayerIsAuthenticated), object: nil)
        return
    }

    // Calling the authentication view controller
    self.localPlayer.authenticateHandler = {(viewController: UIViewController?, error: NSError?) -> Void in

        self.addLastError(error: error)

        if (viewController != nil)
        {
            self.addAuthenticationViewController(authenticationViewController: viewController!)
        }

            // If the localPlayer authenticated successfully notificate
        else if (self.localPlayer.isAuthenticated == true)
        {
            self.gameCenterConnected = true
            print("Local player ID: \(self.localPlayer.playerID)")
            print("Local player Alias: \(self.localPlayer.alias)")
            NotificationCenter.default.post(name: NSNotification.Name(rawValue: Constants.LocalPlayerIsAuthenticated), object: nil)

        }
            // If the localPlayer failed to authenticate
        else
        {
            self.gameCenterConnected = false
        }

        if (error != nil)
        {
            //  Handle error here
        }
    }
}

现在，我得到了这个错误“无法将类型（UIViewController？，NSError？->Void）的值赋给类型'（（UIViewController？，error？->Void）？” 在这一行

 self.localPlayer.authenticateHandler = {(viewController: UIViewController?, error: NSError?) -> Void in

        self.addLastError(error: error)

        if (viewController != nil)

我不知道发生了什么。

---

有人能帮我吗？

对不起，答案很简单，只要换一行就行了：

self.localPlayer.authenticateHandler = {(viewController: UIViewController?, error: NSError?) -> Void in

到

---

我的错！对不起

如果您不理解错误消息，我强烈建议您使用代码补全重新键入函数以获得正确的签名。我有它，我只是没有正确阅读错误消息，我认为它与此相关，并试图找出解决方法，当我看到答案显而易见时。

self.localPlayer.authenticateHandler = {(viewController: UIViewController?, error: Error?) -> Void in