swift – IOS Facebook SDK：尽管授予许可,登录也不会返回电子邮

我正在通过Facebook sdk获取信息,但到目前为止,我只得到用户的身份和名称,尽管我确信有一个电子邮件可用,因为它是我的帐户.我一直在看几个答案,但是迄今为止还没有人解决我的问题.
我做错了什么,为什么我要求几个权限不会返回更多的数据？

这是我的代码：

fbLoginManager.logInWithReadPermissions(["public_profile","email","user_friends","user_about_me","user_birthday"],handler: { (result,error) -> Void in
        if ((error) != nil)
        {
            // Process error
            println("There were an error: (error)")
        }
        else if result.isCancelled {
            // Handle cancellations
            fbLoginManager.logOut()
        }
        else {
            var fbloginresult : FBSDKLoginManagerLoginResult = result
            if(fbloginresult.grantedPermissions.contains("email"))
            {
                println(fbloginresult)
                self.returnUserData()
            }
        }
    })

并获取用户数据的功能：

func returnUserData()
{
    let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me",parameters: nil)
    graphRequest.startWithCompletionHandler({ (connection,result,error) -> Void in

        if ((error) != nil)
        {
            // Process error
            println("Error: (error)")
        }
        else
        {
            println("fetched user: (result)")

            if let userName : NSString = result.valueForKey("name") as? NSString {
                println("User Name is: (userName)")
            }
            if let userEmail : NSString = result.valueForKey("email") as? NSString {
                println("User Email is: (userEmail)")
            }
        }
    })
}

哪个返回：

fetched user: {
id = 55555555;
name = "Kali Aney";
}
User Name is: Kali Aney