swift - 如何更新核心数据中的值？

Question

每次学习闪存卡时，我都会尝试更新闪存卡分数，但分数并没有保存。我究竟做错了什么？

do {

    fetchedCards = try context.fetch(Cards.fetchRequest())

    for cards in fetchedCards {
        if(termLabel.text == cards.term){
            cards.score = score
            ad.saveContext()
            continue
        }
    }

} catch {

}


let ad = UIApplication.shared.delegate as! AppDelegate
let context = ad.persistentContainer.viewContext

标签： swiftcore-data