Facebook Graph API：如何在FB ios SDK中获取组封面图像源

Question

我试图通过图谱API获取群组封面图片来源，但遗憾的是我获得了nil值public_profile权限和user_groups权限无效的范围错误。

我查看了以下Facebook文档：

1. FB Group reading
2. FB Cover photo
3. FB Permission

首先我尝试使用[login logInWithReadPermissions:@[@"public_profile"]权限后来发现我需要使用user_groups。当我使用[login logInWithReadPermissions:@[@"user_groups"]获取以下范围错误

时



我尝试过以下代码

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
    [login logInWithReadPermissions:@[@"user_groups"] fromViewController:self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
        if (error) {
            NSLog(@"Process error");
        } else if (result.isCancelled) {
            NSLog(@"Cancelled");
        } else {
            FBSDKAccessToken *accessToken = [FBSDKAccessToken currentAccessToken];
            NSDictionary *params = @{@"access_token" : accessToken};
            FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
                                          initWithGraphPath:@"/190520617800186?fields=source"
                                          parameters:params
                                          HTTPMethod:@"GET"];
            [request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                                  id result,
                                                  NSError *error) {
                NSLog(@"Success");
            }];
        }
    }];

  

我已经提交了Facebook应用审核请求