ios - 即使我重新启动 iPhone，如何保存分数？

Question

我制作了一个应用程序单一应用程序。我放置了一个名为 CountUpButton 的按钮、一个名为 CountLabel 的标签和另一个按钮 ResetButton。 CountUpButton的功能是当按下按钮时，CountLabel必须改变+1，当按下ResetButton时, CountLabel 必须变为 0。但问题是，每当我重新启动 iPhone 或应用程序时，CountLabel 就会变回 0。它应该保存 CountLabel，因此只有在 时才需要更改ResetButton 被按下。

该函数的代码为:

var CountNumber = 0

@IBAction func ResetButton(sender: UIButton) {
    CountNumber = 0
    CountLabel.text = "0"
}

@IBOutlet var CountLabel: UILabel!

@IBAction func CountUpButton(sender: UIButton) {
    CountNumber += 1
    CountLabel.text = "\(CountNumber)"
}

我用于保存“CountLabel”的代码是:

func saveCounted(){
    let defeaults = NSUserDefaults.standardUserDefaults()
    defeaults.setInteger(CountNumber, forKey: "CountLabel")
}

Answer 1

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var counterLabel: UILabel!
    var counter: Int {
        return NSUserDefaults().integerForKey("counter")
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        counterLabel.text = "\(counter)"
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    @IBAction func countUp(sender: AnyObject) {
        NSUserDefaults().setInteger(counter+1, forKey: "counter")
        counterLabel.text = "\(counter)"

    }
    @IBAction func resetCounter(sender: AnyObject) {
         NSUserDefaults().removeObjectForKey("counter")
        counterLabel.text = "\(counter)"
    }
}