Facebook iOS SDK 3.6 startWithGraphPath完成块未执行

Question

我已经与Facebook集成,因此除其他外,我可以将状态发布到我的Feed中.我基于发布的一些代码来提供开发人员教程.从我的iOS应用程序运行以下Graph API请求时,永远不会调用请求的完成块,并且XCode调试日志中不会出现错误.

[FBRequestConnection
startWithGraphPath:@"me/feed"
parameters:params
HTTPMethod:@"POST"
completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
    if (error) {
        DLog(@"error: domain = %@, code = %d", error.domain, error.code);
    } else {
        DLog(@"Posted action, id: %@", result[@"id"]);
    }
}];

我有两个便利函数,activeSession在执行此请求之前对当前执行检查.它们看起来像这样:

+ (BOOL)facebookSessionIsOpen {
    return (FBSession.activeSession.isOpen);
}

+ (BOOL)facebookSessionHasPublishPermissions {
    if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound ||
        [FBSession.activeSession.permissions indexOfObject:@"publish_stream"] == NSNotFound ||
        [FBSession.activeSession.permissions indexOfObject:@"manage_friendlists"] == NSNotFound) {
        return NO;
    } else {
        return YES;
    }
}

这两个函数都返回YES指示具有必要发布权限的活动会话.更令人困惑的是,在使用以下代码成功执行相同检查(不需要授予发布权限来提取配置文件)后,我可以毫无问题地提取用户的配置文件:

[FBRequestConnection
startWithGraphPath:@"me"
parameters:[NSDictionary dictionaryWithObject:@"picture,id,birthday,email,location,hometown" forKey:@"fields"]
HTTPMethod:@"GET"
completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
    NSDictionary* resultDict = (NSDictionary*)result;

    NSString* emailAddress = resultDict[@"email"];
    NSString* location = resultDict[@"location"][@"name"];
    NSString* birthday = resultDict[@"birthday"];
    NSString* homeTown = resultDict[@"hometown"][@"name"];
    ...
}];

有关如何调试此问题的任何建议？

Answer 1

事实证明这个问题是一个线程问题.Facebook iOS SDK似乎不喜欢在与FBRequest您调用的线程不同的线程openActiveSessionWithReadPermissions上执行并立即死锁.事实证明我在一个单独的线程中运行postStatus请求,如下所示:

dispatch_queue_t some_queue = dispatch_queue_create("some.queue.name", NULL);
dispatch_async(some_queue, ^{
    [FacebookHelper postStatusToFacebookUserWall:newStatus withImage:imageData];
}];

确保您openActiveSessionWithReadPermissions和所有FBRequest排列都发生在同一个线程上,否则您可能会遇到这些无声失败.