swift - View 更改或应用程序关闭后数字不断重置

Question

我正在尝试实现一个分数，在用户观看激励视频广告后，分数将增加 1。我的代码将分数增加 1，但在我更改 View 并返回到分数的 View 后如图所示，分数返回0。如何更新分数？

import UIKit
import GoogleMobileAds
class RewardedAdViewController: UIViewController, 
    GADRewardBasedVideoAdDelegate {

@IBOutlet weak var scoreText: UILabel!

var score = 0
override func viewDidLoad() {
    super.viewDidLoad()
    GADRewardBasedVideoAd.sharedInstance().load(GADRequest(), withAdUnitID: "ca-app-pub-3940256099942544/1712485313")
    GADRewardBasedVideoAd.sharedInstance().delegate = self

    //let defaults = UserDefaults.standard
    //defaults.set(0, forKey: "score")

}



@IBAction func playVideo(_ sender: Any) {
    if GADRewardBasedVideoAd.sharedInstance().isReady == true{
        GADRewardBasedVideoAd.sharedInstance().present(fromRootViewController: self )
    }
}

func rewardBasedVideoAdDidClose(_ rewardBasedVideoAd: GADRewardBasedVideoAd) {

    GADRewardBasedVideoAd.sharedInstance().load(GADRequest(), withAdUnitID: "ca-app-pub-3940256099942544/1712485313")
    GADRewardBasedVideoAd.sharedInstance().delegate = self

}

func rewardBasedVideoAd(_ rewardBasedVideoAd: GADRewardBasedVideoAd, didRewardUserWith reward: GADAdReward) {

    score = score + 1
    scoreText.text = String(score)
}

在上面的代码中，我首先声明了var Score = 0，然后在代码中，当用户看完广告后，分数就会增加 1

func rewardBasedVideoAd(_ rewardBasedVideoAd: GADRewardBasedVideoAd, didRewardUserWith reward: GADAdReward) {

    score = score + 1
    scoreText.text = String(score)
}

感谢您的帮助。

Answer 1

您可能希望使用 NSUserDefaults 将分数本地存储在 iPhone 上，从而允许关闭应用程序并将值保留在系统上 - Apple Developer Documentation