如何从iOS中的Facebook获取用户信息？

Question

当用户会话打开时，如何获取用户名，我尝试了来自Facebook示例的会话登录示例。如果有人知道解决办法，请帮帮我。提前谢谢。

 - (IBAction)buttonClickHandler:(id)sender {
        // get the app delegate so that we can access the session property
        SLAppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];

        // this button's job is to flip-flop the session from open to closed
        if (appDelegate.session.isOpen) {
            // if a user logs out explicitly, we delete any cached token information, and next
            // time they run the applicaiton they will be presented with log in UX again; most
            // users will simply close the app or switch away, without logging out; this will
            // cause the implicit cached-token login to occur on next launch of the application
   //hear i need to fetch user name ?


            [appDelegate.session closeAndClearTokenInformation];

        } else {
            if (appDelegate.session.state != FBSessionStateCreated) {
                // Create a new, logged out session.
                appDelegate.session = [[FBSession alloc] init];
            }

            // if the session isn't open, let's open it now and present the login UX to the user
            [appDelegate.session openWithCompletionHandler:^(FBSession *session,
                                                             FBSessionState status,
                                                             NSError *error) {
                // and here we make sure to update our UX according to the new session state
                [self updateView];
            }];
        }
    }

Answer 1

登录身份验证之后，您可以从active FBSession获得详细信息，如下所示

if (FBSession.activeSession.isOpen) {

    [[FBRequest requestForMe] startWithCompletionHandler:
     ^(FBRequestConnection *connection,
       NSDictionary<FBGraphUser> *user,
       NSError *error) {
         if (!error) {
             NSString *firstName = user.first_name;
             NSString *lastName = user.last_name;
             NSString *facebookId = user.id;
             NSString *email = [user objectForKey:@"email"];
             NSString *imageUrl = [[NSString alloc] initWithFormat: @"http://graph.facebook.com/%@/picture?type=large", facebookId];
         }
     }];
}

更新：而不是id使用objectID属性，在版本V3.14.1(2014年5月12日)发布后，id属性已被废弃

NSString *facebookId = user.objectID;

Answer 2

你好，您可以获得Facebook用户的详细信息，如：

- (void)sessionStateChanged:(NSNotification*)notification {
    if ([[FBSession activeSession] isOpen]) {
        [FBRequestConnection
         startForMeWithCompletionHandler:^(FBRequestConnection *connection,
                                           id<FBGraphUser> user,
                                           NSError *error) {
             if (! error) {

                //details of user
                NSLog(@"User details =%@",user);
             }
         }];
    }else {
        [[FBSession activeSession] closeAndClearTokenInformation];
    }
}

谢谢

Answer 3

if (!error && state == FBSessionStateOpen){
    NSLog(@"Session opened");
    // Show the user the logged-in UI
     FBRequest* userupdate = [FBRequest requestWithGraphPath:@"me" parameters: [NSMutableDictionary dictionaryWithObject:@"picture.type(large),id,birthday,email,gender,username,name,first_name" forKey:@"fields"] HTTPMethod:@"GET"];
    [drk showWithMessage:nil];
    [userupdate startWithCompletionHandler: ^(FBRequestConnection *connection,
                                          NSDictionary* result,NSError *error)
   {
    NSLog(@"dict = %@",result);
   }];
    return;
}