如何检查Facebook是否登录设备？客观C [英] How to check if Facebook is loggedIN in device ? objective C

问题描述

我正在实施Facebook SDK到我的应用程序。我正在使用FBLoginView登录Facebook。我有一个 UIButton ，我用它在用户的Facebook墙上分享。现在我不想使用FBLoginView登录，我想检查是否有一个Facebook应用程序，如果用户已经登录。

   - （IBAction）pickFriendsList：（UIButton *）sender 
 {
 FBFriendPickerViewController * friendPickerController = [[FBFriendPickerViewController alloc] init]; 
 friendPickerController.title = @Pick Friends; 
 [friendPickerController loadData]; 
 
 //使用模态包装方法显示选择器。 
 [friendPickerController presentModallyFromViewController：self animated：YES处理程序：
 ^（FBViewController * sender，BOOL donePressed）{
 
 if（！donePressed）{
 return; 
} 
 NSString * fid; 
 NSString * fbUserName; 
 
 for（id< FBGraphUser> user在friendPickerController.selection中）
 {
 NSLog（@\\\
user =％@ \\\
，user）; 
 fid = user.id; 
 
 fbUserName = user.name; 
 
 NSMutableDictionary * params = [NSMutableDictionary dictionaryWithObjectsAndKeys：@test，@message，@http://webecoist.momtastic.com/wp-content/uploads/2009/01/nature- wonders.jpg，@picture，@Sample App，@name，fid，@tags，fid，@to，@106377336067638，@place，nil] 
 
 
 [FBRequestConnection startWithGraphPath：[NSString stringWithFormat：@％@ / feed，fid]参数：params HTTPMethod：@POSTcompletionHandler：^（FBRequestConnection * connection，id result， NSError *错误）
 {
 
 [FBWebDialogs presentFeedDialogModallyWithSession：nil参数：params处理程序：^（FBWebDialogResult结果，NSURL * resultURL，NSError *错误）
 
 {
如果（错误）
 {
 //启动对话框或发布故事时出错。 
 
 NSLog（@错误发布故事）; 
} 
 else 
 {
 if（result == FBWebDialogResultDialogNotCompleted）{
 //用户点击x图标
 NSLog（@用户已取消故事出版）; 
} 
 else 
 {
 
 //处理发布Feed回调
 
 //告诉用户它有效。 
 
} 
 
 
} 
}]; 
}]; 
 
} 
 
}]; 
 
} 
  

解决方案

假设你正在使用iOS 6 sdk。在这种情况下，使用以下代码（适用于设备）：

  if（[SLComposeViewController isAvailableForServiceType： SLServiceTypeFacebook]）
 {
 
 //用户已经使用iOS集成的FB登录a a c c b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b 
 
 $ b //用户未登录
 
} 
  

注意：FBSession无法检查此条件。所以与FBSession的会话检查与上面的代码有不同的含义。

请问，

I am implementing the Facebook SDK into my app . I am using FBLoginView to login with Facebook. I have a UIButton, which I'm using to share on a user's Facebook wall. Now I don't want to login using FBLoginView , i want to check if there is a Facebook app, and if the user has logged in.

- (IBAction)pickFriendsList:(UIButton *)sender
{
    FBFriendPickerViewController *friendPickerController = [[FBFriendPickerViewController alloc] init];
    friendPickerController.title = @"Pick Friends";
    [friendPickerController loadData];

    // Use the modal wrapper method to display the picker.
    [friendPickerController presentModallyFromViewController:self animated:YES handler:
     ^(FBViewController *sender, BOOL donePressed) {

         if (!donePressed) {
             return;
         }
         NSString* fid;
         NSString* fbUserName;

         for (id<FBGraphUser> user in friendPickerController.selection)
         {
             NSLog(@"\nuser=%@\n", user);
             fid = user.id;

             fbUserName = user.name;

             NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"test", @"message", @"http://webecoist.momtastic.com/wp-content/uploads/2009/01/nature-wonders.jpg", @"picture", @"Sample App", @"name",fid,@"tags",fid,@"to",@"106377336067638",@"place", nil];


                 [FBRequestConnection startWithGraphPath:[NSString stringWithFormat:@"%@/feed",fid] parameters:params               HTTPMethod:@"POST" completionHandler:^(FBRequestConnection *connection,id result,NSError *error)
                                          {

             [FBWebDialogs presentFeedDialogModallyWithSession:nil                                                     parameters:params  handler:^(FBWebDialogResult result, NSURL *resultURL, NSError *error)

              {
                  if (error)
                  {
                      // Error launching the dialog or publishing a story.

                      NSLog(@"Error publishing story.");
                  }
                  else
                  {
                      if (result == FBWebDialogResultDialogNotCompleted) {
                          // User clicked the "x" icon
                          NSLog(@"User canceled story publishing.");
                      }
                      else
                      {

                          // Handle the publish feed callback

                               //Tell the user that it worked.

                           }


                  }
              }];
                                              }];

         }

     }];

}

解决方案

I am assuming that you are using iOS 6 sdk. In which case, Use below code (workable for device) :

if([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) 
{

//user is already logged in using iOS integrated FB a/c

}
else
{

//user is not logged in

}

Note: FBSession can't check this criteria. So session check with FBSession has a different meaning from above code.

Regards,

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