Swift - 使用NSUserDefaults保存高分 [英] Swift - Saving highscore using NSUserDefaults

问题描述

我正在使用Swift制作游戏。我想使用NSUserDefaults保存用户的高分。我知道如何在我的AppDelegate文件中创建一个新的NSUserDefaults变量：

I'm using Swift to make a game. I want to save the users high score using NSUserDefaults. I know how to create a new NSUserDefaults variable in my AppDelegate file:

let highscore: NSUserDefaults = NSUserDefaults.standardUserDefaults()

但是如何在我的视图控制器中设置/获取它？

But how do I set/get this in my view controllers?

推荐答案

首先，NSUserDefaults是一个字典（我认为是NSDictionary）。每个应用都有自己的用户默认值，因此您无法从任何其他应用访问用户默认值。

At first, NSUserDefaults is a dictionary (NSDictionary I think). Every app has its own user defaults, so you cannot access the user defaults from any other app.

如果用户（玩游戏的用户）获得新的高分，你必须保存这样的高分：

If the user (the one who plays your game) makes a new highscore, you have to save that highscore like this:

let highscore = 1000
let userDefaults = NSUserDefaults.standardUserDefaults()
userDefaults.setValue(highscore, forKey: "highscore")
userDefaults.synchronize() // don't forget this!!!!

然后，当你想获得用户所做的最高分时，你必须阅读字典中的高分如下：

Then, when you want to get the best highscore the user made, you have to "read" the highscore from the dictionary like this:

if let highscore = userDefaults.valueForKey("highscore") {
    // do something here when a highscore exists
}
else {
    // no highscore exists
}

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