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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loadingOperations.append(loadOperation)
//
除非所有图片加载完成，
//
否则不会执行这个任务
loadingComplete.addDependency(loadOperation)
}
imageLoadingQueue.addOperations(loadingOperations, waitUntilFinished: false)
imageLoadingQueue.addOperation(loadingComplete)
讨论
当你创建一个
OperationQueue
时，你可以同时指定它的
qualityOfService
属性。
默认，任务队列的这个属性是
background
，也就是说，
OS
会优先执行其他高优先
级的任务。一般，对于加载资源这样的任务来说，这正是我们希望的，因为让应用
程序始终能够对用户输入保持响应是一件更重要的事情。
当用户正在忙于其他事情的时候，你可以根据剩余内存的多少使用这种技术。例如，
在用户进入游戏主菜单后，在用户点击“开始新游戏”之前，我们可以在后台加载
游戏要用到的一些资源。
1.18
在游戏中使用单元测试
问题
我们需要对游戏的每一部分进行单独的测试，以便确保这部分代码功能正常。
解决方案
通过单元测试，我们可以为游戏中的每个功能编写单独的测试代码。默认情况下，
所有新建项目都会自带一个空的单元测试集，在里面你可以加入一个个的测试函数。
对于已经存在的项目，你可以创建新的单元测试集，方法就是选择
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.