swift - 解析 Facebook 登录集成处理无效 session

Question

我想知道是否有人知道 swift3 中以下更新的代码。我从 Parse Server github(下面的链接)得到了这个。

FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:nil];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
if (!error) {
    // handle successful response
} else if ([[error userInfo][@"error"][@"type"] isEqualToString: @"OAuthException"]) { // Since the request failed, we can check if it was due to an invalid session
    NSLog(@"The facebook session was invalidated");
    [PFFacebookUtils unlinkUserInBackground:[PFUser currentUser]];
} else {
    NSLog(@"Some other error: %@", error);
}

}];

具体来说，我想了解要检查的内容

"[[error userInfo][@"error"][@"type"] isEqualToString: @"OAuthException"]". 

我明白如果 swift3 我想将其设置为

"if error = (error as? NSError!).userInfo[something]"

但我不确定需要在 userinfo[] 中传递哪个参数。例如。 FBSDKGraphRequestErrorCategoryKey、FBSDKGraphRequestErrorGraphError 等

https://github.com/ParsePlatform/ParseUI-iOS/wiki/Integrate-Login-with-Facebook

Answer 1

API 将返回 HTTP 400 状态代码、JSON 正文中的代码和子代码，解释错误的性质。在您的情况下， session 无效。只需将其转换为变量并检查它是否等于 "OAuthException" 。

{
      "error": {
        "message": "Error validating access token: The session is invalid 
                    because the user logged out.", 
        "type": "OAuthException", 
        "code": 190
      }
    }