Facebook iOS SDK 3.5.1:openActiveSessionWithReadPermissions - 完成处理程序调用两次

时间:2013-05-22 08:24:34

标签: ios objective-c facebook facebook-ios-sdk

我有一个共享链接的按钮。我基本上使用两个电话: openActiveSessionWithReadPermissionsrequestNewPublishPermissions

所以这是按钮动作:

- (IBAction) shareFacebookButtonAction:(id)sender
if (![[FBSession activeSession] isOpen])
        {
            NSArray *permissions = @[@"read_friendlists", @"email"];
            [FBSession openActiveSessionWithReadPermissions:permissions
                                               allowLoginUI:YES
                                          completionHandler:^(FBSession *session,
                                                              FBSessionState state,
                                                              NSError *error)
             {
                 if (FB_ISSESSIONOPENWITHSTATE([session state]))
                 {
                     [self _prepareShare];
                 }
                 else
                 {
                     // show alert view with error
                 }
             }];
        }
        else
        {        
            [self _prepareShare];
        }
    }

如果没有在会话中找到任何人,我会要求获得发布许可

-(void) _prepareShare;
{
    if ([FBSession.activeSession.permissions
         indexOfObject:@"publish_actions"] == NSNotFound)
    {
        [FBSession.activeSession
         requestNewPublishPermissions:
         [NSArray arrayWithObject:@"publish_actions"]
         defaultAudience:FBSessionDefaultAudienceFriends
         completionHandler:^(FBSession *session, NSError *error)
         {
             if (!error)
             {
                 [self _share];
             }
             else
             {
                 //error
             }
         }];
    } else
    {
       [self _share];
    }
}

_share只是发布了一些内容

-(void) _share;
{

    NSMutableDictionary *params_dict = [NSMutableDictionary dictionary];
    // setting some params

    [FBRequestConnection startWithGraphPath:@"me/feed" parameters:params_dict HTTPMethod:@"POST" completionHandler:^(FBRequestConnection *connection, id result, NSError *error)
    {
        if (result)
        {
            // sharing succedeed, do something
        }
        else if (error)
        {
            //sharing failed, do something else
        }
    }];
}

我第一次尝试分享(已经登录过iOS6中的FB和已经授权的应用程序)openActiveSessionWithReadPermissions的完成处理程序被调用两次: 一次使用FBSessionStateOpen,一次使用FBSessionStateOpenTokenExtended(来自openSessionForPublishPermissions调用)。 因此,_share也会被调用两次,第一次在else的{​​{1}}部分(如果我已经拥有发布权限),第二次在openSessionForPublishPermissions的完成处理程序中。 所以我在Facebook墙上有一个双重帖子,这是我第一次分享应用程序。我还有_prepareShare的崩溃报告(我无法让它再次发生)。

处理这种情况的正确方法是什么?

3 个答案:

答案 0 :(得分:13)

看起来,通过设计,Facebook SDK保留了对块处理程序的引用,即使在它们被调用之后也是如此。因此,在您对 openActiveSessionWithReadPermissions 的调用中,如果会话状态发生更改,则可以多次调用完成处理程序。请参阅Facebooks comment on this issue here

作为一种解决方法,您可能希望实现自己的机制,以确保只处理一次处理程序:

__block FBSessionStateHandler runOnceHandler = ^(FBSession *session,
                                             FBSessionState status,
                                             NSError *error) { /* YOUR CODE HERE */ };

...

 [FBSession openActiveSessionWithReadPermissions:YOUR_PERMISSIONS
                                       allowLoginUI:YES
                                  completionHandler:^(FBSession *session,
                                                      FBSessionState status,
                                                      NSError *error) {
                                      if (runOnceHandler) {
                                          runOnceHandler(session, status, error);
                                          runOnceHandler = nil;
                                      }

                                  }
     ];

答案 1 :(得分:2)

您可以使用此

- (IBAction)facebookBasti:(id)sender {
if(FBSession.activeSession.isOpen){

    [[FBRequest requestForMe] startWithCompletionHandler:^(FBRequestConnection *connection, NSDictionary<FBGraphUser> *user, NSError *error) {
        if (!error) {

            NSLog(@" Email = %@",[user objectForKey:@"email"]);
        }
    }];

    NSLog(@"POST TO WALL -- %@",FBSession.activeSession.accessToken);
    [self publishFacebook];

}
else {
    // try to open session with existing valid token
    NSArray *permissions = [[NSArray alloc] initWithObjects:
                            @"publish_actions",@"email",
                            nil];
    FBSession *session = [[FBSession alloc] initWithPermissions:permissions];
    [FBSession setActiveSession:session];
    if([FBSession openActiveSessionWithAllowLoginUI:NO]) {
        // post to wall
        [[FBRequest requestForMe] startWithCompletionHandler:^(FBRequestConnection *connection, NSDictionary<FBGraphUser> *user, NSError *error) {
            if (!error) {

                NSLog(@" Email = %@",[user objectForKey:@"email"]);
            }
        }];

        NSLog(@"POST TO WALL -- %@",FBSession.activeSession.accessToken);
        [self publishFacebook];
    } else {
        // you need to log the user
        NSLog(@"login");

        [FBSession openActiveSessionWithPermissions:permissions
                                       allowLoginUI:YES
                                  completionHandler:^(FBSession *session,
                                                      FBSessionState state,
                                                      NSError *error) {
                                      NSLog(@"POST TO WALL -- %@",FBSession.activeSession.accessToken);
                                      [self publishFacebook];

                                  }];
    }
}

}

和publishFacebook方法

   -(void)publishFacebook
   {
NSMutableDictionary *postParams2= [[NSMutableDictionary alloc] initWithObjectsAndKeys:
                                   haberLink, @"link",
                                   @"abc.com", @"name",
                                   title, @"caption",
                                   desc, @"description",
                                   nil];

[FBRequestConnection
 startWithGraphPath:@"me/feed"
 parameters:postParams2
 HTTPMethod:@"POST"
 completionHandler:^(FBRequestConnection *connection,
                     id result,
                     NSError *error) {
     NSString *alertText;
     if (error) {
         alertText = [NSString stringWithFormat:
                      @"error: domain = %@, code = %d",
                      error.domain, error.code];
     } else {
         alertText = [NSString stringWithFormat: @"Shared Facebook"];



         [[[UIAlertView alloc] initWithTitle:@"Shared Facebook"
                                     message:alertText
                                    delegate:self
                           cancelButtonTitle:@"Ok"
                           otherButtonTitles:nil]
          show];

     }
 }];

}

答案 2 :(得分:1)

请阅读Upgrading from 3.0 to 3.1,特别是段落要求阅读&amp;单独写权限。似乎Facebook SDK并不打算以这种方式使用。

  

您现在需要单独请求读取和发布权限(并按此顺序)。最有可能的是,当应用程序启动并且用户首次登录时,您将请求个性化的读取权限。稍后,如果适当,您的应用程序可以在打算将数据发布到Facebook时请求发布权限。

  

重要的是,您不要简单地尝试背对背地调用两个单独的方法来替换任何已弃用的函数。

我想知道你是如何设法解决这个问题的。顺便说一句,我得到了相同的崩溃报告(FBSession:在先前的重新授权呼叫尚未完成时重新授权无效)。