ios - 如何从代码中获取 Facebook 访问 key

Question

令人困惑的困境:当我使用一个 URL 获取我的 friend 列表时，我可以很好地恢复该列表，使用相同的 URL 但具有查询字符串 (?fields=id,name,picture) 和完全相同的权限，我得到指示“必须使用事件访问 token 来查询有关当前用户的信息”的错误。给了什么？

当前有效的权限是 publish_stream、email 和 read_stream。为什么添加那个查询字符串会搞砸呢？我唯一能想到的是，我拥有的访问 key 不是我想的那样。有没有办法提取实际的访问 key ，将其公开在 NSLog 中，然后在图形浏览器上对其进行测试？

有效的 URL 是:

https://graph.facebook.com/me/friends

不存在的 URL 是:

https://graph.facebook.com/me/friends?fields=id,name,picture

这是真正获取权限的代码。事实上，这与 Stuart Breckenridge 在 GitHub 上免费提供的代码相同(感谢老兄!)只要我不在 api 调用的末尾附加 '?fields=name,id,picture'，它似乎就可以正常工作:

-(void)requestPermissions
{
    if (debugF) NSLog(@"FAM: requestPermissions");
    // Specify the Facebook App ID.
    _facebookAppID = @"123456789123456"; // You Must Specify Your App ID Here.

    // Submit the first "read" request.
    // Note the format of the facebookOptions dictionary. You are required to pass these three keys: ACFacebookAppIdKey, ACFacebookAudienceKey, and ACFacebookPermissionsKey
    // Specify the read permission
    _facebookPermissions = @[@"email"];

    // Create & populate the dictionary the dictionary
    _facebookOptions = @{   ACFacebookAppIdKey : _facebookAppID,
                         ACFacebookAudienceKey : ACFacebookAudienceFriends,
                      ACFacebookPermissionsKey : _facebookPermissions};

    _facebookAccountType = [_facebookAccountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];

    [_facebookAccountStore requestAccessToAccountsWithType:_facebookAccountType options:_facebookOptions completion:^(BOOL granted, NSError *error)
     {
         // If read permission are granted, we then ask for write permissions
         if (granted) {

             _readPermissionsGranted = YES;

             // We change the _facebookOptions dictionary to have a publish permission request
             _facebookPermissions =  @[@"publish_stream", @"read_stream", @"friends_photos"];

             _facebookOptions = @{         ACFacebookAppIdKey : _facebookAppID,
                                        ACFacebookAudienceKey : ACFacebookAudienceFriends,
                                     ACFacebookPermissionsKey : _facebookPermissions};


             [_facebookAccountStore requestAccessToAccountsWithType:_facebookAccountType options:_facebookOptions completion:^(BOOL granted2, NSError *error)
              {
                  if (granted2)
                  {
                      _publishPermissionsGranted = YES;
                      // Create the facebook account
                      _facebookAccount = [[ACAccount alloc] initWithAccountType:_facebookAccountType];
                      _arrayOfAccounts = [_facebookAccountStore accountsWithAccountType:_facebookAccountType];
                      _facebookAccount = [_arrayOfAccounts lastObject];
                  }

                  // If permissions are not granted to publish.
                  if (!granted2)
                  {
                      if (debugF) NSLog(@"Publish permission error: %@", [error localizedDescription]);
                      _publishPermissionsGranted = NO;
                  }

              }];
         }

         // If permission are not granted to read.
         if (!granted)
         {
             if (debugF) NSLog(@"Read permission error: %@", [error localizedDescription]);
             _readPermissionsGranted = NO;

             if ([[error localizedDescription] isEqualToString:@"The operation couldn’t be completed. (com.apple.accounts error 6.)"])
             {
                 [self performSelectorOnMainThread:@selector(showError) withObject:error waitUntilDone:NO];
             }
         }
     }];
}

Answer 1

事实证明，我最初问题的答案比我想象的要简单:

NSString *acessToken = [NSString stringWithFormat:@"%@", self.facebookAccount.credential.oauthToken];

然而，感谢所有为对话做出贡献的人。