ios - 如何从 FBSession 获取访问 token ？

Question

我正在使用 Facebook SDK 来获取应用程序中的用户组 但我得到一个空访问 token 。 我在viewDidLoad中的代码如下。

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.session = [[FBSession alloc] initWithAppID:appID permissions:@[@"basic_info",@"user_groups",@"email"] defaultAudience:FBSessionDefaultAudienceEveryone urlSchemeSuffix:nil tokenCacheStrategy:nil];

[FBSession openActiveSessionWithReadPermissions:@[@"basic_info",@"user_groups",@"email"] allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
    NSLog(@"Error in Session Opening %@",error.description);
        NSLog(@"access Token %@",session.accessTokenData.accessToken);
        [FBRequestConnection startWithGraphPath:@"me/groups" parameters:nil HTTPMethod:@"GET" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
            if (!error) {
                NSLog(@"%@",result);
            }else
            {
                NSLog(@"Error %@",error.description);
            }


        }];


}];
}

这段代码的输出是:-

Error in Session Opening (null)
access Token (null)
Error Error Domain=com.facebook.sdk Code=5 "The operation couldn’t be completed. (com.facebook.sdk error 5.)" UserInfo=0x1090acc80 {com.facebook.sdk:HTTPStatusCode=400, com.facebook.sdk:ParsedJSONResponseKey={
    body =     {
        error =         {
            code = 2500;
            message = "An active access token must be used to query information about the current user.";
            type = OAuthException;
        };
    };
    code = 400;
}}

如您所见，访问 token 为空..

我做错了什么？

是否需要在此代码中添加一些额外的内容？

谢谢

Answer 1

你想要这个:

session.accessTokenData.accessToken

“ session ”是您的 FBSession

你可以从...中得到

if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded)
{
// If there's one, just open the session silently, without showing the user the login UI
[FBSession openActiveSessionWithReadPermissions:@[@"public_profile", @"email"]
               allowLoginUI:NO
                         completionHandler:^(FBSession *session,     FBSessionState state, NSError *error)
        {
          NSLog(@"%@", session.accessTokenData.accessToken);
        }];
    }