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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160
｜
第
5
章
讨论
对于游戏而言，读取文件有两种主要方式：
•
文件中包含的信息需要在内存中保持完整，因为每次我们都需要所有内容（例
如纹理图片、关卡布局，以及某些声音文件）。
•
文件中包含大量信息，但每次只需要读取一小部分数据（例如，怪物的数据，
玩家信息，任务对话等）。
当从大文件中读取少量数据时，数据库确实更快、更高效，但缺点是增加了代码的
复杂性。
5.6
管理资源集
问题
游戏中有大量大文件，我们想在后台加载它们，这样就不会让主线程变慢。
解决方案
新建一个
AssetLoader
类。在
AssetLoader.swift
中编写如下代码：
class AssetLoader: NSObject {
//
为了方便，我们定义一个元组，用于代表已加载的资源。
//
元组中包含有已加载的资源的
URL
、
//
数据和一个
NSError
对象
typealias LoadingResult = (url: URL, data: Data?, error: Error?)
//
同时定义一个加载结果处理函数，接收一个
URL
参数，
//
以及一个
Data
参数或
Error
参数
typealias LoadingResultHandler = (URL, Data?, Error?) -> Void
class func loadAssets(at urls: [URL],
withEnumerationBlock loadingComplete: @escaping LoadingResultHandler) ...
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