Question

我希望标签foxmill使用用户默认值存储高分。显然如果有一个新的高分我希望它被替换。问题是totalTime（跟踪得分的是）是一个double而不是int。所有教程都使用int作为高分教程。

    import UIKit
class winViewController: UIViewController {

@IBOutlet var score2: UILabel!
@IBOutlet var winningLabel: UILabel!


    @IBOutlet var foxMill: UILabel!


    @IBOutlet var hhighscore: UILabel!
    public var LebelText: String?
    public var LebelText2: String?
    public var LebelText3: String?
    public var LebelText4: String?



override func viewDidLoad() {
    super.viewDidLoad()
                timeCalculation()
     loadState()



           }
    func saveScore(score: Double) {

        // Instantiate user defaults
        let userDefaults:UserDefaults = UserDefaults.standard

        // Set your score
        userDefaults.set(score, forKey: "highScore")

        // Sync user defaults
        userDefaults.synchronize()

    }

    func loadState() {
        let userDefaults = UserDefaults.standard
        let score = userDefaults.double(forKey: "highScore")
        foxMill.text = "High Score: \(score)"
    }
            func timeCalculation(){

        guard let unwrapedText = self.LebelText2 else {
            return
        }

        guard let unwrapedText2 = self.LebelText else {
                return
        }
        guard let unwrapedText3 = self.LebelText3 else {
            return
        }
        guard let unwrapedText4 = self.LebelText4 else {
            return
        }

        if let myInt = Double(unwrapedText),  let myInt2 = Double(unwrapedText2), let myInt3 = Double(unwrapedText3), let myInt4 = Double(unwrapedText4)


        {
            var  totalTime = myInt + myInt2 + myInt3 + myInt4
            self.winningLabel.text = "You won"+"\n"+"Reaction time :" + String(totalTime) + " Seconds"
             saveScore(score: totalTime)

                }}}

Answer 1

您只需使用正确的密钥保存该值，然后在检索时，确保以Double：

的方式执行此操作

 func saveScore(score: Double) {

     // Instantiate user defaults
     let userDefaults:UserDefaults = UserDefaults.standard

     // Set your score
     userDefaults.set(score, forKey: "highScore")

     // Sync user defaults
     userDefaults.synchronize()

}

现在，当您更新分数值时，当您说...（unwrappedText）时，请确保保存用户默认值

if let myInt = Double(unwrapedText),  let myInt2 = Double(unwrapedText2), let myInt3 = Double(unwrapedText3), let myInt4 = Double(unwrapedText4)

    // HERE you do whatever it was you originally did with the text, but also save a value

    saveScore(score: myInt)

{

现在下次加载应用时，加载分数：

func loadScore() {
     // Instantiate User Defaults
     let userDefaults = UserDefaults.standard
     let score = userDefaults.double(forKey: "highScore")
}

当你想要一个Double而不是Integer

时，你真的不应该命名一个属性“myInt”

如果您希望foxMill标签在加载时显示此高分，则您需要做两件事。首先确保在应用关闭之前，您可以通过同步UserDefaults来保存状态，在applicationDidEnterBackground中查看applicationWillTerminate和AppDelegate等方法 - 但这有点超出了你的问题的范围。现在，我假设你上次通过调用上面列出的saveScore(score:)函数退出应用程序时已经正确保存了状态。因此，现在您要检索分数并在加载时更新foxMill标签。你会做这样的事情：

您可以通过修改上述loadScore方法来执行此类操作：

func loadScore() {
     // Instantiate User Defaults
     let userDefaults = UserDefaults.standard
     let score = userDefaults.double(forKey: "highScore")
     foxMill.text = "High Score: \(score)"
}

然后在viewDidLoad：

结束时

override func viewDidLoad() {
    super.viewDidLoad()

    loadScore()
}

或者您可以更改方法以返回一个字符串，然后将其分配给标签的文本：

func loadScore() -> String {
     // Instantiate User Defaults
     let userDefaults = UserDefaults.standard
     let score = userDefaults.double(forKey: "highScore")
     return "High Score: \(score)"
}

然后在viewDidLoad：

override func viewDidLoad() {
    super.viewDidLoad()

    foxMill.text = loadScore()
}

需要创建一个userdfualt，将double保存为高分（swift3）

1 个答案: