January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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存储数据
｜
165
解决方案
答案很简单：不抛弃数据。如果游戏能够存储数据，那么它就应该保存游戏的状态。
在一个
iOS
游戏中，不要以为用户会手动保存游戏，我们应当利用每个可能的机会
自动保存数据。
讨论
如果因为一个呼入的电话而导致用户丢失了他的游戏进度，这是最令人糟心的事情。
不要为此惹恼你的用户：请定期保存游戏的状态！
5.9
游戏中的财富值
问题
我们需要记录游戏中的资源数，如玩家所拥有的财富值。
解决方案
这种功能需求会因不同游戏而异。当然，在许多游戏中，财富值都是比较常见的，
因此这里给出了一个处理的办法。
在这个例子中，假设有两种不同的货币：钻石和金币。钻石是固定资产，从这一关
到下一关都存在。金币是消耗品，当游戏结束时会清零。为了同时支持这两种货币，
我们用一个计算属性来存放钻石数，并将这个值放到
UserDefaults
中，同时将金
币数放到内存里（当游戏结束时清零）：
class CurrencyManager {
var gold : Int = 0
var gems : Int {
set(value) {
//
将钻石数放到用户
Defaults
系统
UserDefaults.standard.set(value, forKey: "gems")
}
get {
//
从用户
Defaults
系统取回钻石数
return UserDefaults.standard.integer(forKey: "gems")
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