FBSDKLoginManager 未在本机 ios 应用程序中打开登录对话框

Posted 2023-03-17

【中文标题】FBSDKLoginManager 未在本机 ios 应用程序中打开登录对话框

【英文标题】：FBSDKLoginManager not open login Dialog in native ios apps

【发布时间】：2015-06-11 04:19:58

【问题描述】：

我是 iPhone 开发的新手，我想使用最新的 facebook sdk 4 从我的原生 ios 简单应用程序进行 facebook 登录。我只想从自定义 UIButton 打开一个 facebook 登录对话框，在我的应用程序中为此，我在按钮单击方法中执行以下代码..

- (IBAction)didTapLoginFaceBook:(id)sender 

    FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
    [login logInWithReadPermissions:@[@"email"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) 
        if (error) 
            // Process error

        NSLog(@"Unexpected login error: %@", error);
        NSString *alertMessage = error.userInfo[FBSDKErrorLocalizedDescriptionKey] ?: @"There was a problem logging in. Please try again later.";
        NSString *alertTitle = error.userInfo[FBSDKErrorLocalizedTitleKey] ?: @"Oops";
        [[[UIAlertView alloc] initWithTitle:alertTitle
                                        message:alertMessage
                                       delegate:nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil] show];


         else if (result.isCancelled) 
            // Handle cancellations
         else 
            // If you ask for multiple permissions at once, you
            // should check if specific permissions missing
            if ([result.grantedPermissions containsObject:@"email"]) 
                // Do work
            
        
    ];

此代码的工作方式有所不同，但我想打开一个登录对话框表单自定义UIButton 在本机 iOS 应用程序中单击。

所以，请用一些代码提出正确的方法，提前谢谢

【参考方案1】：

在 Objective-C 中使用自定义按钮的 Facebook 登录 4.x

- (IBAction)btnFacebookPressed:(id)sender 
    FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
    login.loginBehavior = FBSDKLoginBehaviorBrowser;
    [login logInWithReadPermissions:@[@"email"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
     
         if (error)
         
             // Process error
         
         else if (result.isCancelled)
         
             // Handle cancellations
         
         else
         
             if ([result.grantedPermissions containsObject:@"email"])
             
                 NSLog(@"result is:%@",result);
                 [self fetchUserInfo];
                 [login logOut];
             
         
     ];


- (void)fetchUserInfo 
    if ([FBSDKAccessToken currentAccessToken])
    
        NSLog(@"Token is available : %@",[[FBSDKAccessToken currentAccessToken]tokenString]);

        [[[FBSDKGraphRequest alloc] initWithGraphpath:@"me" parameters:@@"fields": @"id, name, link, first_name, last_name, picture.type(large), email, birthday, bio ,location , friends ,hometown , friendlists"]
         startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) 
             if (!error)
             
                 NSLog(@"resultis:%@",result);

             
             else
             
                 NSLog(@"Error %@",error);
             
         ];
    

在 Swift 中使用自定义按钮的 Facebook 登录 4.x

@IBAction func btnFacebookPressed(_ sender: Any) 

    let loginManager = FBSDKLoginManager()
    loginManager.loginBehavior = FBSDKLoginBehavior.browser;

    loginManager.logIn(withReadPermissions: ["email"], from: self, handler: (result : FBSDKLoginManagerLoginResult?, error : Error?) -> Void in
        if error != nil 
            // Process error
        
        else if (result?.isCancelled)! 
            // Handle cancellations
        
        else if (result?.grantedPermissions.contains("email"))! 
            print("result is: \(result)");
            self.fetchUserInfo()
            loginManager.logOut()
        
    )



func fetchUserInfo() 
    if let accessToken = FBSDKAccessToken.current()?.tokenString 
        print("Token is available : \(accessToken)")

        FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, link, first_name, last_name, picture.type(large), email, birthday, bio ,location , friends ,hometown , friendlists"]).start(completionHandler:  (connection : FBSDKGraphRequestConnection?, result : Any?, error : Error?) in

            if let error = error 
                print("Error \(error)")
            
            else if let result  = result 
                print("result:\(result)")
            
        )
    

【讨论】：

它如何注销当前用户？当我再次按下登录按钮时，它直接进入“您已经授权演示应用程序”..

我用另一个按钮注销，

@Hirenkanetiya 是的，将此代码添加到您的注销按钮的操作中

@Hirenkanetiya [[FBSDKLoginManager new] logOut];

从登录按钮的代码中删除注销代码，并通过单击按钮注销您自己。你也可以检查这个答案***.com/questions/15610152/…