Facebook SDK：用於發佈流的FBLoginView

Question

下面的代碼在單擊fbloginview時允許用戶的讀取權限後嘗試重新授予發佈權限。

#pragma mark FBLoginViewDelegate Method 
- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView user:(id<FBGraphUser>)user { 
    NSLog(@"User info fetched %@ %@", user.name, user.id); 

    [Global FBUser:user.first_name lastname:user.last_name fid:user.id]; 

    if ([[FBSession activeSession] isOpen]) 
    { 
     //[[FBSession activeSession] closeAndClearTokenInformation]; 

     [[FBSession activeSession] reauthorizeWithPublishPermissions:[[[NSArray alloc] initWithObjects:@"publish_stream", nil] autorelease] 
     defaultAudience:FBSessionDefaultAudienceEveryone 
     completionHandler:^(FBSession* session, NSError* error) 
     { 
      if ([delegate respondsToSelector:@selector(SignUpAlertViewWasDone:)]) 
       [delegate SignUpAlertViewWasDone:self]; 

      [self removeFromSuperview]; 
     } 
     ]; 
    } 

它給了我這個錯誤在這裏：

異常「com.facebook.sdk：InvalidOperationException異常」，理由是：「FBSession：這不是有效的重新授權，而以前的重新授權的呼叫尚未完成「。

是否有一個函數，我可以檢測到前次重新授權的呼叫完成？

我嘗試使用openWithPublishPermission，但它不起作用。

Answer 1

嘗試把它叫做異步

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

    if ([[FBSession activeSession] isOpen]) 
    { 
     dispatch_async(dispatch_get_current_queue(), ^{ 
      [[FBSession activeSession] reauthorizeWithPublishPermissions:[[[NSArray alloc] initWithObjects:@"publish_stream", nil] autorelease] 
                 defaultAudience:FBSessionDefaultAudienceEveryone 
                 completionHandler:^(FBSession* session, NSError* error) 
      { 
       if ([delegate respondsToSelector:@selector(SignUpAlertViewWasDone:)]) 
        [delegate SignUpAlertViewWasDone:self]; 

       [self removeFromSuperview]; 
      }]; 
     }; 
    } 
}