ios - 如何在 if 语句中使用可选值？

Question

我从 xml 文件中得到“sinavid”，我想使用“id”的值(xml 中的一个标签..)

如果id=2的值，主视图转到storyboard id=2的其他 View

但我不能使用 sinavid 的值，因为可选值(我认为)

P.S:对不起我的英语:(

sinavid = haberler.objectAtIndex(indexPath.row).valueForKey("id") as! NSString as String 

if (sinavid! == "2"){

        row = "b"

        let viewcontroller = storyboard?.instantiateViewControllerWithIdentifier(row)
        self.navigationController?.pushViewController(viewcontroller!, animated: true)


    }

    else {

        let viewcontroller = storyboard?.instantiateViewControllerWithIdentifier(row)
        self.navigationController?.pushViewController(viewcontroller!, animated: true)


    }

Answer 1

if let sinaVID = sinavid, sinaVID == "2"  {
    row = "b"
    let viewcontroller = storyboard?.instantiateViewControllerWithIdentifier(row)
    self.navigationController?.pushViewController(viewcontroller!, animated: true)
} else {
    let viewcontroller = storyboard?.instantiateViewControllerWithIdentifier(row)
    self.navigationController?.pushViewController(viewcontroller!, animated: true)
}