Facebook SSO并请求iOS SDK

问题描述

我正在尝试向当前用户发布一条墙消息。在我做请求之前，我正在验证会话并授权它是否存在。自从澄清以来，我遗漏了一些声明和变量的初始化。问题是这里显示的代码是在执行fbDidLogin-delegate方法之前执行的。因此，Facebook对象在请求之前似乎没有有效的访问令牌。我做了一个单身人士。下次我运行程序时它可以工作。

I am trying to post a wall message to the current user. Before I am doing the request I am validating the session and authorizing if it isn't. I left out some of the declarations and the initializing of the variables since to clarify. The problem is that the code shown here is executed before the fbDidLogin-delegate method is executed. So it seems like the Facebook object doesn't have the valid access token before it is requesting. I have made a singleton. Next time I run the program it works.

委托

- (void)fbDidLogin
{
    NSLog(@"DEBUG: DID LOG IN");

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"];
    [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"];
    [defaults synchronize];
}

Viewcontroller

Viewcontroller

Facebook *facebook = [SocialMedia sharedFacebookAuthorized];

        NSString *name = nil;
        NSString *message = nil;
        NSString *picture = nil;

        if (self.didPassTest) {
            // Code
        } else {
            // Code
        }

        NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                       name, @"name",
                                       message, @"message",
                                       picture, @"picture",
                                       description, @"description",
                                       link, @"link",
                                       caption, @"caption", nil];

        [facebook requestWithGraphPath:@"me/feed" andParams:params andHttpMethod:@"POST" andDelegate:self];

SharedFacebook..function

SharedFacebook..function

+ (Facebook *)sharedFacebookAuthorized
{
    [self sharedFacebook];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if ([defaults objectForKey:@"FBAccessTokenKey"] && [defaults objectForKey:@"FBExpirationDateKey"]) {
        facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
        facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"];
    }

    NSArray *permissions = [[NSArray arrayWithObjects:@"email", @"read_stream", @"publish_stream", nil] retain];

    NSLog(@"START?");

    if (![facebook isSessionValid]) {
        [facebook authorize:permissions];
        NSLog(@"INSIDE?");
    }

    NSLog(@"CONTINUE?");
    return facebook;
}

推荐答案

这是一项异步任务。在从图形API请求任何内容之前，您必须等待授权异步调用完成。请参阅我在此处对类似问题的回复：

This is an asynchronous task. You have to wait for the authorize asynchronous call to complete before requesting anything from the graph API. See my response to a similar question here: How to react to asynchronous events (login)?

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