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

Question

我有一个共享链接的按钮.我基本上使用两个电话: openActiveSessionWithReadPermissions和requestNewPublishPermissions.

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权限,我要求获得发布许可

-(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只发帖

-(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
        }
    }];
}

我第一次尝试共享(已经登录过iOS6和已授权的应用程序)完成处理程序openActiveSessionWithReadPermissions被调用两次:一次使用FBSessionStateOpen,一次使用FBSessionStateOpenTokenExtended(来自openSessionForPublishPermissions调用).因此,_share也会调用两次,第一次在(如果我已经拥有发布权限)的else部分中_prepareShare,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.我也有一份崩溃报告FBSession: It is not valid to reauthorize while a previous reauthorize call has not yet completed(我无法再次发生).

处理这种情况的正确方法是什么？

Answer 1

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.在这里查看Facebook对这个问题的评论.

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;
                                      }

                                  }
     ];

Answer 2

你可以用这个

- (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];

     }
 }];

}