ios - 如何使用 Swift 删除注销按钮并永久存储 session FBSDK IOS

Question

我正在创建一个应用程序，用户可以在其中使用 Facebook 登录。我正在获取用户信息，例如个人资料图片用户名等。现在，当我点击使用 facebook 按钮登录时，FB 请求允许我登录。但是随后在与 LoginWithFacebook 按钮相同的位置显示了注销按钮。我想删除注销按钮，因为我不希望用户注销。我想存储 session 并一直使用它直到应用程序被卸载，因为我不希望用户每次打开应用程序时都登录。 到目前为止，这是我的代码

class ViewController: UIViewController, FBSDKLoginButtonDelegate {
@IBOutlet weak var btnFacebook: FBSDKLoginButton!
@IBOutlet weak var ivUserProfileImage: UIImageView!
@IBOutlet weak var lblName: UILabel!
var strFirstName: String!
var strLastName: String!
var strPictureURL: String!

override func viewDidLoad() {
    super.viewDidLoad()
    configureFacebook()
}

func configureFacebook()
{
    btnFacebook.readPermissions = ["public_profile", "email", "user_friends"];
    btnFacebook.delegate =  self
}

func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!)
{
    FBSDKGraphRequest.init(graphPath: "me", parameters: ["fields":"first_name, last_name, picture.type(large)"]).startWithCompletionHandler { (connection, result, error) -> Void in
        //fetching first and last name
        self.strFirstName = (result.objectForKey("first_name") as? String)!
        self.strLastName = (result.objectForKey("last_name") as? String)!
        self.strPictureURL = (result.objectForKey("picture")?.objectForKey("data")?.objectForKey("url") as? String)!
        // contactinating first and last name
        self.lblName.text = "Welcome, \(self.strFirstName) \(self.strLastName)"
        // assinging image
        self.ivUserProfileImage.image = UIImage(data: NSData(contentsOfURL: NSURL(string: self.strPictureURL)!)!)
        }
}

func loginButtonDidLogOut(loginButton: FBSDKLoginButton!) {
    let loginManager: FBSDKLoginManager = FBSDKLoginManager()
    //for logging out from facebook
    loginManager.logOut()
}

Answer 1

您可以在通过 facebook 登录后 Conceal 注销按钮，方法如下，

 if(FBSDKAccessToken.currentAccessToken() != nil)
 {
       self.btnFacebook.hidden = true
 }
 else
 {
       self.btnFacebook.hidden = false
 }

注意:您需要在代码中的每次登录和注销后检查此项，以便您可以轻松维护该按钮日志。

对于Session，在LoginController的viewDidLoad中写这个获取用户信息，

    self.btnFacebook.delegate = self
    self.btnFacebook.readPermissions = ["public_profile","email","user_friends"]

    FBSDKProfile.enableUpdatesOnAccessTokenChange(true)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "getUserProfile:", name: FBSDKProfileDidChangeNotification, object: nil)

    if(FBSDKAccessToken.currentAccessToken() != nil)
    {
        let accessToken = FBSDKAccessToken.currentAccessToken()
        if(accessToken != nil)
        {

            let req = FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"email,name"], tokenString: accessToken.tokenString, version: nil, HTTPMethod: "GET")
            req.startWithCompletionHandler({ (connection, result, error : NSError!) -> Void in
                if(error == nil)
                {
                    let userInfo = result as AnyObject
                    if let _ = userInfo.valueForKey("email") as? NSString
                    {
                        // Extract user info here
                        let userDic : NSDictionary = NSDictionary(dictionary: userInfo as! [NSObject : AnyObject])
                        print(userDic)
                    }
                    else
                    {
                       // Logout if you want or display error message
                       // let loginManager = FBSDKLoginManager()
                       // loginManager.logOut()
                    }
                }

            })
        }
    }

调用这个观察者方法，

func getUserProfile(notification : NSNotification)
{
    let accessToken = FBSDKAccessToken.currentAccessToken()
    if(accessToken != nil)
    {

        let req = FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"email,name"], tokenString: accessToken.tokenString, version: nil, HTTPMethod: "GET")
        req.startWithCompletionHandler({ (connection, result, error : NSError!) -> Void in
            if(error == nil)
            {
                let userInfo = result as AnyObject
                if let _ = userInfo.valueForKey("email") as? NSString
                {
                    let userDic : NSDictionary = NSDictionary(dictionary: userInfo as! [NSObject : AnyObject])
                    print(userDic)
                }
                else
                {
                    // logout or error message 
                    //let loginManager = FBSDKLoginManager()
                    //loginManager.logOut()
                }
            }
        })
    }
}

希望对您有所帮助。