Facebook iOS 3.1 sdk使用发布权限回调登录

Question

我无法使用facebook 3.1 ios sdk中的发布权限登录.

我的应用程序有一个共享视频的按钮,当用户点击它时,我想添加基本+发布权限.据我了解,我必须做两个电话 -

1. openActiveSessionWithReadPermissions, 然后
2. reauthorizeWithPublishPermissions

这是我现在使用的代码:

//Opens a Facebook session and optionally shows the login UX.
- (void)openSessionForReadPermissions
{
    [FBSession openActiveSessionWithReadPermissions:nil
                                       allowLoginUI:YES
                                  completionHandler:
     ^(FBSession *session,
       FBSessionState state, NSError *error) {

         //this is called even from the reauthorizeWithPublishPermissions
         if (state == FBSessionStateOpen && !error)
         {
             [self openSessionForPublishPermissions];
         }
         else if (state == FBSessionStateClosedLoginFailed)
         {
             [FBSession.activeSession closeAndClearTokenInformation];

             [[NSNotificationCenter defaultCenter] postNotificationName:FBLoginErrorNotification object:session];
         }
     }];
}

-(void)openSessionForPublishPermissions
{    
    NSArray* permissions = [NSArray arrayWithObject:@"publish_stream"];

    [[FBSession activeSession] reauthorizeWithPublishPermissions:permissions
                                                 defaultAudience:FBSessionDefaultAudienceFriends
                                               completionHandler:
     ^(FBSession *session, NSError *error)
     {
         if (!error)
         {
             [[NSNotificationCenter defaultCenter]
              postNotificationName:FBLoginSuccessNotification
              object:session];
         }
         else
         {
             [[NSNotificationCenter defaultCenter]
              postNotificationName:FBLoginErrorNotification
              object:session];
         }
     }];
}

我看到openSessionForReadPermissions中的块被调用两次(一次使用FBSessionStateOpen,一次使用来自openSessionForPublishPermissions调用的FBSessionStateOpenTokenExtended),并且在第一次尝试登录应用程序时获得ErrorReauthorizeFailedReasonUserCancelled(如果O之前删除了所有应用程序权限).

实现此登录的正确方法是什么？该应用程序不需要Facebook登录,除了这一功能,因此登录过程应该在同一个按钮上.

谢谢!

Answer 1

我碰到了同样的问题.我发现的解决方案是将调用包装[self openSessionForPublishPermissions];在dispatch_async块中.

例:

dispatch_async(dispatch_get_current_queue(), ^{
    [self openSessionForPublishPermissions];
});

原因是重新授权的调用需要在调用openActiveSession ..的事件循环之后.