Question

我正在尝试使用Facebook SDK for iOS使用自定义Facebook登录来获取用户信息。我成功登录用户，但我不知道如何访问用户信息。这是我的登录功能：

func facebookLogin() {
    if (FBSession.activeSession().state == FBSessionState.Open || FBSession.activeSession().state == FBSessionState.OpenTokenExtended)
    {
        // Close the session and remove the access token from the cache
        // The session state handler (in the app delegate) will be called automatically
        FBSession.activeSession().closeAndClearTokenInformation()
    }
    else
    {
        // Open a session showing the user the login UI
        // You must ALWAYS ask for public_profile permissions when opening a session

        FBSession.openActiveSessionWithReadPermissions(["public_profile", "email"], allowLoginUI: true, completionHandler: {
            (session:FBSession!, state:FBSessionState, error:NSError!) in
            self.sessionStateChanged(session, state: state, error: error)
        })
    }

}

然后当会话打开时，调用函数sessionStateChanged：

func sessionStateChanged(session:FBSession, state:FBSessionState, error:NSError?){
    if ((error) != nil){
        NSLog("Error")
        FBSession.activeSession().closeAndClearTokenInformation()
    }
    else{
        if (state == FBSessionState.Open){
            //I would like to get the user token or FBGraphUser here but i don't know how
        }

    }
    if (state == FBSessionState.Closed || state == FBSessionState.ClosedLoginFailed){
        NSLog("Session Clossed")
    }
    if (FBErrorUtility.shouldNotifyUserForError(error) == true){
        NSLog("Something went wrong")
    }
    else{
        if (FBErrorUtility.errorCategoryForError(error) == FBErrorCategory.UserCancelled){
            NSLog("User cancelled login")
        }
        else if (FBErrorUtility.errorCategoryForError(error) == FBErrorCategory.AuthenticationReopenSession){
            NSLog("Current session is no valid")
        }
    }
}

Answer 1

今天遇到完全相同的问题！我不确定这是否是理想的做事方式，但这是我的同事向我展示的解决方法：

FBSession.openActiveSessionWithReadPermissions(["public_profile"], allowLoginUI: false) { session, state, error in

let request = FBRequest(session: FBSession.activeSession(), graphPath: "/me")
request.startWithCompletionHandler({ (connection, result, error) -> Void in

    println(result)
    let birthday = result.valueForKey("birthday") as String
    println("\(birthday)")
})

self.fbSessionStateChanged(session, state: state, error: error)
}

请原谅丑陋的代码，我还在尝试使用Swift。希望它有所帮助！

Answer 2

您可以使用：

将FBLoginViewDelegate添加到班级

声明此

@IBOutlet var fbLoginView : FBLoginView!

将此var（fbLoginView）与故事板中的新视图相关联。这个新视图可以隐藏，因此它不会产生任何影响，但可以帮助您跟踪信息

在viewDidLoad

中

override func viewDidLoad() {
    super.viewDidLoad()
    //facebook login
    self.fbLoginView.delegate = self
    self.fbLoginView.readPermissions = ["public_profile", "email"]
}

并添加此功能

func loginViewFetchedUserInfo(LoginView : FBLoginView!, user: FBGraphUser){
    println("User name: \(user.name)")
    //THE USER WAS LOGGED
}

当用户通过facebook验证时，使用FBLoginViewDelegate自动返回loginViewFetchedUserInfo方法，您可以使用“user”变量获取信息

在Swift中使用Facebook自定义登录获取用户信息

2 个答案: