Facebook iOS SDK：刷新过期的访问令牌而不显示对话框(Facebook iOS SDK: refreshing an expired access token without presenting a dialog)

 我正在使用Facebook iOS SDK 。 在我的代码中，我已经授权我的应用程序具有默认权限，所以我的会话有效，直到到期日为止。 但是，在达到有效期后，我会尝试重新授权以“刷新我的OAuth令牌”， 如前所述 。 
 
 但是，当我尝试重新授权时，它会显示一个对话框，说明我已经授权我的应用程序，即使我希望它仅更新我的OAuth令牌而无需进行对话。 根据Facebook， 这是可能的 ： 
 
 
 
 将用户重定向到身份验证对话框时，如果用户已经授权了您的应用程序，则不会提示用户输入权限。 Facebook将向您返回一个有效的访问令牌，无需任何用户对话 。 
 
 
 但是，我确实得到了一个对话框，我想知道如何刷新访问令牌而无需获取对话框。 

I'm using the Facebook iOS SDK. In my code I have authorized my app with the default permissions, so my session is valid until the expiration date is reached. However, after the expiration date is reached, I attempt to reauthorize in order to "refresh my OAuth token", as asked before.
 
However, when I attempt to reauthorize, it displays a dialog saying I have already authorized my app, even though I expect it to just update my OAuth token without a dialog. According to facebook, this is possible:
 
 
 
When you redirect the user to the auth dialog, the user is not prompted for permissions if the user has already authorized your application. Facebook will return you a valid access token without any user facing dialog.
 
 
However, I do get a dialog and I'd like to know how I can refresh the access token without getting the dialog.

原文：https://stackoverflow.com/questions/8373383