xcode 使用 NSuserdefaults 在 Swift 和 Sprite Kit 中设置 HighScore

Setting Up HighScore in Swift and Sprite Kit using NSuserdefaults

提问by georgiohelou

I am building a swift game and a need to set up a highscore , i have been trying to figure out how to do it for a while. So please can you tell me how to search this library to see if there is a already saved high score and then compare it to the user's score. I have tried coming out with this but it won't work. Please Help and be as clear as possible. Giving me example code would be extremely appreciated.

我正在构建一个 swift 游戏并且需要设置一个高分，我一直试图弄清楚如何做到这一点。所以请您告诉我如何搜索该库以查看是否有已经保存的高分，然后将其与用户的分数进行比较。我试过提出这个问题，但它行不通。请帮助并尽可能清楚。给我示例代码将不胜感激。

    if let highscore: AnyObject = NSUserDefaults.valueForKey("highscore") { 
      var savedScore: Int = NSUserDefaults.standardUserDefaults().objectForKey("highScore") as Int
        if ( savedScore < Score) { 
            var highscore = Score
            NSUserDefaults.standardUserDefaults().setObject(highscore, forKey:"highscore")
            NSUserDefaults.standardUserDefaults().synchronize() }
    }
    else { 
        var highscore = Score
        NSUserDefaults.standardUserDefaults().setObject(highscore, forKey:"highscore")
        NSUserDefaults.standardUserDefaults().synchronize()
   }

回答by Imanou Petit

Create a new iOS project in Xcode by using the Single View Applicationtemplate. Then, replace the content of ViewController.swiftwith the following code:

使用Single View Application模板在 Xcode 中创建一个新的 iOS 项目。然后，将 的内容替换ViewController.swift为以下代码：

import UIKit

class ViewController: UIViewController {

    var generator = [6, 12, 8].generate()

    override func viewDidLoad() {
        super.viewDidLoad()

        let button = UIButton(type: .System)
        button.setTitle("Button", forState: .Normal)
        button.addTarget(self, action: "newScore", forControlEvents: .TouchUpInside)
        button.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(button)

        // Auto layout code using anchors (requires iOS9+)
        let horizontalConstraint = button.centerXAnchor.constraintEqualToAnchor(view.centerXAnchor)
        let verticalConstraint = button.centerYAnchor.constraintEqualToAnchor(view.centerYAnchor)
        NSLayoutConstraint.activateConstraints([horizontalConstraint, verticalConstraint])

        // Print NSUserDefaults's highscore value when app is launched
        print("highscore:", NSUserDefaults.standardUserDefaults().integerForKey("highscore"))
    }

    func newScore() {
        guard let score = generator.next() else { return }
        print("current score:", score)

        //Check if score is higher than NSUserDefaults stored value and change NSUserDefaults stored value if it's true
        if score > NSUserDefaults.standardUserDefaults().integerForKey("highscore") {
            NSUserDefaults.standardUserDefaults().setInteger(score, forKey: "highscore")
            NSUserDefaults.standardUserDefaults().synchronize()
        }

        print("highscore:", NSUserDefaults.standardUserDefaults().integerForKey("highscore"))
    }

}

---

---

Build and run the project on your iPhone or on the simulator. The Xcode console will print 0, which is the current value for NSUserDefaults.standardUserDefaults().integerForKey("highscore").

在您的 iPhone 或模拟器上构建并运行项目。Xcode 控制台将打印 0，这是NSUserDefaults.standardUserDefaults().integerForKey("highscore").

Now, click on the button. This will set the value of scoreto 6and, because 6 > 0, NSUserDefaults.standardUserDefaults().integerForKey("highscore")will get this new value.

现在，单击按钮。这将设置的值score，以6和，因为6 > 0，NSUserDefaults.standardUserDefaults().integerForKey("highscore")就会获得这个新的价值。

Click once again on the button. This will set the value of scoreto 12. You will immediately see in the console that NSUserDefaults.standardUserDefaults().integerForKey("highscore")gets this new value.

再次单击按钮。这会将 的值设置score为12。您将立即在控制台中看到NSUserDefaults.standardUserDefaults().integerForKey("highscore")获取此新值的信息。

Now, if you change the value of scoreto 8by clicking on the button, you will see that NSUserDefaults.standardUserDefaults().integerForKey("highscore")still has a value of 12because 8 < 12.

现在，如果您通过单击按钮更改scoreto的值8，您将看到它NSUserDefaults.standardUserDefaults().integerForKey("highscore")的值仍然是12因为8 < 12。

If you rebuild your project and relaunch it, you will see that NSUserDefaults.standardUserDefaults().integerForKey("highscore")is persistent (its value is still 12 and has not been reset). Therefore, NSUserDefaultscan be a perfect tool in order to store your players highest scores.

如果你重建你的项目并重新启动它，你会看到它NSUserDefaults.standardUserDefaults().integerForKey("highscore")是持久的（它的值仍然是 12 并且没有被重置）。因此，NSUserDefaults可以成为一个完美的工具来存储你的玩家最高分。

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Extra tip

额外小费

NSUserDefaults.standardUserDefaults().integerForKey("highscore")always return an Int(if you haven't set it by yourself, it will return 0, not nil). Thus, you dont need to / can't use optional binding with it. If you really want to deal with an optional value return, you will prefer NSUserDefaults.standardUserDefaults().objectForKey("highscore") as? Int.

NSUserDefaults.standardUserDefaults().integerForKey("highscore")总是返回 an Int（如果你没有自己设置它，它会返回0，而不是nil）。因此，您不需要/不能对它使用可选绑定。如果你真的想处理一个可选的值返回，你会更喜欢NSUserDefaults.standardUserDefaults().objectForKey("highscore") as? Int.

回答by jigar parmar

var defaults=NSUserDefaults()
var highscore=defaults.integerForKey("highscore")

if(Score>highscore)
{
    defaults.setInteger(Score, forKey: "highscore")
}
var highscoreshow=defaults.integerForKey("highscore")

lblHighScore.text="\(highscoreshow)"
println("hhScore reported: \(lblHighScore.text)")
lblPlayScore.text="\(Score)"
println("play reported: \(lblPlayScore.text)")