ios - Swift:处理 Facebook token 错误

Question

我正在尝试处理 Facebook token 失效时的事件。例如，当用户更改 Facebook 密码时。当我使用时:

FBSDKAccessToken.refreshCurrentAccessToken

并且用户更改密码，我会得到

Error validating access token: The session has been invalidated because the user has changed the password.

错误如下所示:

com.facebook.sdk:FBSDKGraphRequestErrorParsedJSONResponseKey={
body =     {
    error =         {
        code = 190;
        "error_subcode" = 460;
        "fbtrace_id" = HFdKjQiGR0m;
        message = "Error validating access token: The session has been invalidated because the user has changed the password.";
        type = OAuthException;
    };
};
code = 400;
}, NSLocalizedRecoveryOptions=(
    OK,
    Cancel
)}

如何验证这些错误代码以便采取适当的措施？

Answer 1

看看FBSDKGraphRequestConnection.h包含完成处理程序类型 (FBSDKGraphRequestHandler)。此完成处理程序为您提供结果和错误，您可以解析以获取消息，然后执行您需要的操作。