如何使用Swift删除Logout按钮并永久存储会话FBSDK IOS

我正在创建一个用户可以使用Facebook登录的应用程序。 我正在获取用户信息，如个人资料图片用户名等。现在，当我点击登录与Facebook按钮FB请求允许我进入。但然后有登出按钮显示在LoginWithFacebook按钮的同一个地方。 我想删除注销按钮，因为我不希望用户注销。 我想存储会话并一直使用它，直到app被取消，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

手动将fb登录按钮变量添加到视图控制器

 let fbLoginBtn = FBSDKLoginButton() 

在你的viewDidLoad中

 view.addSubView(fbLoginBtn) 

通过检查处理隐藏的登录状态btn FBSDKAccessToken.currentAccessToken()是否有值

并且您可以通过FBSDKLoginManager().logOut()编程方式注销FBSDKLoginManager().logOut()

Answer 2

您可以通过Facebook使用以下代码登录后隐藏退出按钮，例如，

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

注意：您需要在每次登录后检查并在代码中注销，以便您可以轻松维护该按钮日志。

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

  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() } } }) } } 

希望这会帮助你。