Question

我有一个程序，当用户按下播放按钮时会播放不同的音频剪辑。要播放音频，信用值必须大于1。我尝试使用UserDefaults进行如下操作，但每次似乎都在重置。

class ViewController: UIViewController,.....
    var dataCredit = 3

    ....

    @IBAction func playsound(_ sender: Any) {
        defaults.set(dataCredit, forKey: "credits")

        credit = defaults.integer(forKey: "credits")

        if credit > 0 {
            feedLabel.text = "you have credits)"
            dataCredit = dataCredit - 1
            defaults.set(dataCredit, forKey: "credits")
            dataCredit = defaults.integer(forKey: "credits")
        } else if credit == 0 {
            feedLabel.text = "you dont have Credit\(startCredit)"
        }

这是我目前拥有的。每次我重新启动应用程序时，dataCredit都会恢复为3，并且它不记得我存储的值。

Answer 1

那是因为您始终将@SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }称为操作中的第一件事。您正在这样做：

defaults.set(dataCredit, forKey: "credits")

更新：

要设置功劳的初始值，我建议在AppDelegate-class ViewController: UIViewController,..... .... @IBAction func playsound(_ sender: Any) { if let credit = defaults.integer(forKey: "credits"), credit > 0 { feedLabel.text = "you have credits)" dataCredit = dataCredit - 1 defaults.set(dataCredit, forKey: "credits") dataCredit = defaults.integer(forKey: "credits") } else if credit == 0 { feedLabel.text = "you dont have Credit\(startCredit)" } }方法中进行设置：

didFinishLaunchingWithOptions

UserDefaults重置为新启动

1 个答案: