我无法在 iOS 中从 Facebook 获取用户数据

Posted 2023-02-24

【中文标题】我无法在 iOS 中从 Facebook 获取用户数据

【英文标题】：I am not able to fetch user data from Facebook in iOS

【发布时间】：2013-11-28 10:35:21

【问题描述】：

我是 iPhone 编程的新手。使用下面的代码，我登录 Facebook 并获取数据。但这里的问题是，如果单击 Loginwithfacebook 按钮 Facebook 对话框打开。然后如果再次输入 Facebook 的用户名和密码单击相同的按钮，然后我正在获取用户数据。但是我不想单击两次。而且一旦我登录 Facebook.inside 应用程序，我当时想获取用户数据我不登录再一次，直到我点击注销。请给我最好的主意。

-(void)LoginWithFacebookk:(id)sender
 
   if (!FBSession.activeSession.isOpen) 

    FBSession *session = [[FBSession alloc] init];
    // Set the active session
    [FBSession setActiveSession:session];
    // Open the session
    [session openWithBehavior:FBSessionLoginBehaviorForcingWebView
            completionHandler:^(FBSession *session,
                                FBSessionState status,
                                NSError *error)
     


            ];

        
        else
        
            NSLog(@"open response");
            FBRequest* friendsRequest = [FBRequest requestForMe];
            [friendsRequest startWithCompletionHandler: ^(FBRequestConnection *connection,NSDictionary <FBGraphUser> *user,NSError *error) 

                NSString *emailiddd=[NSString stringWithFormat:@"%@",[user objectForKey:@"email"]];

                NSLog(@"%@",emailiddd);
                NSString *post = [NSString stringWithFormat:@"email=%@",emailiddd];

                NSLog(@"%@",post);

     ];
               
    

【参考方案1】：

如果您正在查看 Facebook 在FacebookSDK 中提供的示例代码，则有一个示例SessionLoginSample请检查是如何工作的：-

你必须像这样配置你的应用程序：-

在本机 ios 应用程序中，您必须设置您在项目中使用的应用程序包 ID，例如（com.compame.projecname）

为了在您的项目中实施，我在这里解释一下。

在 .h 文件中使用IBOutlet 创建一个按钮，然后像往常一样将此按钮连接到 xib

#import <FacebookSDK/FacebookSDK.h>


@interface LoginViewController : UIViewController<FBLoginViewDelegate>

    IBOutlet UIButton *FB_login; // just connect IBoutlate no need to give IBAction
    FBLoginView *loginview;


@property (strong, nonatomic) id<FBGraphUser> loggedInUser;
@property (strong, nonatomic) IBOutlet FBProfilePictureView *profilePic; //this is for show profile pic or logged in user

在 .m 文件中 @implementation 登录视图控制器 @synthesize profilePic = _profilePic;

- (void)viewDidLoad

    loginview = [[FBLoginView alloc] init];
    loginview =
    [[FBLoginView alloc] initWithPublishPermissions:[NSArray arrayWithObjects:@"publish_actions",@"email",nil] defaultAudience:FBSessionDefaultAudienceFriends];

    loginview.frame =FB_login.frame;//CGRectMake(90,149, 280, 55);
    for (id obj in loginview.subviews)
    
        if ([obj isKindOfClass:[UIButton class]])
        
            UIButton * loginButton =  obj;

            UIImage *loginImage = [UIImage imageNamed:@"btn_fb_login.png"];
            [loginButton setBackgroundImage:loginImage forState:UIControlStateNormal];
            [loginButton setBackgroundImage:nil forState:UIControlStateSelected];
            [loginButton setBackgroundImage:nil forState:UIControlStateHighlighted];
            [loginButton sizeToFit];
        
        if ([obj isKindOfClass:[UILabel class]])
        
            UILabel * loginLabel =  obj;
            loginLabel.text =@""; //@"Log in to facebook";
            loginLabel.textAlignment = NSTextAlignmentCenter;
            loginLabel.frame =CGRectMake(123,149, 280, 55);// CGRectMake(0, 0, 271, 37);
        
    

    loginview.delegate = self;

    [self.view addSubview:loginview];

    [super viewDidLoad];



-(void)LogOut:(NSNotification *)notif

    [self loginViewShowingLoggedOutUser:loginview];
    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (NSHTTPCookie *each in cookieStorage.cookies) 
        // put a check here to clear cookie url which starts with twitter and then delete it
        [cookieStorage deleteCookie:each];
    


#pragma  mark------ FaceBook Sign In method------------

- (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView 

    NSLog(@"Logged In");




- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user 

    NSLog(@"%@",user);
    self.profilePic.profileID = user.id;






- (void)loginViewShowingLoggedOutUser:(FBLoginView *)loginView 
    // Called after logout
    NSLog(@"Logged out");

    self.profilePic.profileID = nil;
    [FBSession.activeSession closeAndClearTokenInformation];



- (void)loginView:(FBLoginView *)loginView handleError:(NSError *)error 
    // see https://developers.facebook.com/docs/reference/api/errors/ for general guidance on error handling for Facebook API
    // our policy here is to let the login view handle errors, but to log the results
    NSLog(@"FBLoginView encountered an error=%@", error);

注意：- 如果您尝试使用FBProfilePictureView 设置登录用户的图像，请不要忘记将[FBProfilePictureView class]; 添加到应用程序代表中，如贝娄

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

    [FBProfilePictureView class];
    // Override point for customization after application launch.
    return YES;

这是给你的示例代码 Sample code Facebook log-in with Image

【讨论】：

非常感谢@nitin

你伟大的 Nithinva :)))) @Nithin Gohel

【参考方案2】：

如果你愿意，你也可以用 Parse 来做：

- (IBAction)facebookRegistrationButtonPressed 

        // The permissions requested from the user

        NSArray *permissionsArray = @[@"email", @"user_about_me", @"publish_actions", @"status_update", @"manage_pages", @"publish_stream"];

        // Login PFUser using Facebook
        [PFFacebookUtils logInWithPermissions:permissionsArray block:^(PFUser *user, NSError *error) 
            if (!user) 
                if (!error) 
                    NSLog(@"Uh oh. The user cancelled the Facebook login.");
                 else 
                    NSLog(@"Uh oh. An error occurred: %@", error);
                
             else if (user.isNew) 
                NSLog(@"User with facebook signed up and logged in!");
                [self processFacebookRequest];
             else 
                NSLog(@"User with facebook logged in!");
                [self processFacebookRequest];
            
        ];
    

    - (void)processFacebookRequest 
        FBRequest *request = [FBRequest requestForMe];
        // Send request to Facebook
        [request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) 
            if (!error) 
                // result is a dictionary with the user's Facebook data
                NSDictionary *userData = (NSDictionary *)result;
                NSString * email = [result objectForKey:@"email"];

                NSString *facebookID = userData[@"id"];
                NSLog(@"facebookID = %@", facebookID);

             else 
                NSLog(@"error : %@", error.localizedDescription);
            
        ];
    

【讨论】：

感谢重播。PFFacebookUtils 是什么？

PFFacebookUtils 是与 Parse 框架关联的类。不是重播，而是使用 Parse 框架的替代方案：www.parse.com