Swift：处理Facebook令牌错误

Question

我正在尝试处理Facebook令牌无效时的事件。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，以便我采取适当的措施？

Answer 1

查看包含完成处理程序类型（CommonDataKinds.Phone.NUMBER）的FBSDKGraphRequestConnection.h。此完成处理程序为您提供结果和错误，您可以解析该消息以获取消息，然后执行您需要的操作。