Question

我正在创建拼图文字游戏，即使用户退出应用程序，如何增加，保存和更新分数？但是我希望在UILabel上添加点并在完成动画后增加

代码：

class QuestionView: UIViewController {

    var score = 0

    func animate(sender: UIButton) {

        UIView.animate(withDuration: 2, delay: 0, usingSpringWithDamping: 0.2, initialSpringVelocity: 6, options: .allowUserInteraction, animations: { [weak self] in

            sender.transform = .identity

        }) { (finished) in

            score += 2 // Must be increase by 2

        }

    }

    func createCoins() {

        let lblCoins = UILabel()
        lblCoins.text = "\(score)"
        self.view.addSubview(lblCoins)

    }

}

Answer 1

更新得分变量后，您还必须更新 lblCoins.text 。要将数据保存在磁盘上，您可以写入设备文档目录中的文件。保存每次分数变化的数据。

这可以帮到你： http://www.seemuapps.com/read-to-and-write-from-a-text-file-in-swift

应用程序启动从文件读取并设置您的分数变量。您可以在 viewDidLoad 中执行此操作。

Answer 2

我认为您正在询问如何跟踪值（分数），以便您可以在用户再次打开应用时检索它。如果是这种情况，那么您可以使用UserDefaults database。

UserDefaults非常适合存储少量数据，例如分数或用户偏好。

以下示例中显示的synchronize方法调用是可选的：iOS会不时自动拨打该电话。但是，如图所示，您可以手动调用它，以确保您的分数在适当的时间更新。

Swift 3.x：

// define a constant String name for the key where the score will be stored
// (note: this can be any name you want; I randomly chose "scoreKey")
let scoreKey = "scoreKey"

// even if the key's value isn't Bool, iOS will return 'false'
// if the key hasn't been set or 'true' if it has been set
let scoreKeyExists: Bool = NSUserDefaults.standardUserDefaults().boolForKey(scoreKey)

// if no value has been set, yet, then set an initial value 
if !scoreKeyExists {
    NSUserDefaults.standardUserDefaults().setInt(0, forKey: scoreKey)
    NSUserDefaults.standardUserDefaults().synchronize()
}

// retrieve the value when needed
let currentScore = NSUserDefaults.standardUserDefaults().intForKey(scoreKey)

// set value as needed
let newScore = 10
NSUserDefaults.standardUserDefaults().setInt(newScore, forKey: scoreKey)
NSUserDefaults.standardUserDefaults().synchronize()

斯威夫特4：

// define a constant String name for the key where the score will be stored
// (note: this can be any name you want; I randomly chose "scoreKey")
let scoreKey = "scoreKey"

// even if the key's value isn't Bool, iOS will return 'false'
// if the key hasn't been set
let scoreKeyExists: Bool = UserDefaults.standard.bool(forKey: scoreKey)

// if no value has been set, yet, then set an initial value 
if !scoreKeyExists {
    UserDefaults.standard.set(0, forKey: scoreKey)
    UserDefaults.standard.synchronize()
}

// retrieve the value when needed
let currentScore = UserDefaults.standard.int(forKey: scoreKey)

// set value as needed
let newScore = 10
UserDefaults.standard.set(newScore, forKey: scoreKey)
UserDefaults.standard.synchronize()

而且，为了在finish关闭期间更新您的标签，您需要使您的标签成为一个全局变量，就像您的分数一样。

您可以通过Interface Builder将其添加为IBOutlet。查看本教程，了解如何Connect the UI to Code。

的示例

Answer 3

这是我的解决方案：

func animate(sender: UIButton) {

    UIView.animate(withDuration: 2, delay: 0, usingSpringWithDamping: 0.2, initialSpringVelocity: 6, options: .allowUserInteraction, animations: { [weak self] in

        sender.transform = .identity

    }) { (finished) in

        score += 2
        lblScoreCoins.text = String(score)
        UserDefaults.standard.set(lblScoreCoins.text, forKey: "Key")

    }

}

增加，保存并更新分数到UILabel

3 个答案: