根据新的Facebook SDK，您必须使用 FBSDKGraphRequest

As per the new Facebook SDK, you must have to pass the parameters with the FBSDKGraphRequest

if((FBSDKAccessToken.currentAccessToken()) != nil){
    FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, email"]).startWithCompletionHandler({ (connection, result, error) -> Void in
        if (error == nil){
            println(result)
        }
    })
}

文件链接： https://developers.facebook.com/docs/facebook-login/permissions/v2.4

用户对象参考： https://developers.facebook.com/docs/graph-api/reference/user

使用公开个人资料，您可以获得性别：

With public profile you can get gender :

public_profile (Default)

Provides access to a subset of items that are part of a person's public profile. A person's public profile refers to the following properties on the user object by default:

id
name
first_name
last_name
age_range
link
gender
locale
timezone
updated_time
verified