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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148
第 5 章
存储数据
游戏也是
App
，而
App
离不开数据。无论是游戏所需的资源，还是游戏的存档文件，
最终都需要将数据保存到存储芯片，后者构成了
iOS
设备上的存储系统。
本章，我们将学习如何将数据转变成可存储的数据，如何使用
iCloud
，如何在加载
资源时不会对游戏的其他部分造成阻塞等等。
5.1
保存游戏状态
问题
我们必须保存游戏对象的状态，同时也能从磁盘上加载它们。
解决方案
让你想保存和加载对象去实现
Codable
协议，并通过
Encoder
和
Decoder
类将你想
保存
/
载入的对象转换成原始类型的数据。
例如，假设你想保存
/
加载游戏。要保存的游戏主要包括三样东西：玩家所在关卡，
玩家名字，以及他在游戏中达到的成就。这个成就可以用一个枚举来表示：
//
玩家能够达到的成就
enum Achievements : String, Codable {
case startedPlaying
case finishedGameInTenMinutes
存储数据
｜
149
case foundAllSecretRooms
}
//
这个对象表示将被保存的游戏
class SavedGame : Codable {
var levelNumber = 0
var playerName = ""
var ...
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