Swift App 首次运行检测 [英] Swift App first run detection

问题描述

在 swift 中，我如何检测这是否是应用程序第一次运行?我想创建一个简单的游戏，如果应用程序是新的，则将高分设置为 0.如果我输入这个:

in swift, how can i detect if this is the first time the app is ran ? i want to create a simple game that sets the high score to 0 if the app is new. if i typed this :

 override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    

    NSUserDefaults.standardUserDefaults().setObject(0, forKey: "firstrun")
    if ( NSUserDefaults.standardUserDefaults().objectForKey("firstrun")?.integerValue == 0 ){
        
        NSUserDefaults.standardUserDefaults().setObject(0, forKey: "HighScore")
        else {
      
            outputLabel.text = String(NSUserDefaults.standardUserDefaults().objectForKey("HighScore")
      }
}

这个第一次运行"每次启动后都会重置为0，我该如何解决这个问题

This "firstrun" will be reseted to 0 after every launch, how can i solve this issue

推荐答案

NSUserDefaults 有一个用于此目的的 registerDefaults: 方法.使用它(在 application:didFinishLaunchingWithOptions: 中).

NSUserDefaults has a registerDefaults: method for this purpose. Use it (in application:didFinishLaunchingWithOptions:).

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