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Swift游戏开发经典实例
book

Swift游戏开发经典实例

by Jonathon Manning, Paris Buttfield-Addison
January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
China Electric Power Press Ltd.
Content preview from Swift游戏开发经典实例
游戏的设计
35
1.17
加载游戏资源
问题
为了提高游戏性能,我们需要按需加载游戏的资源。
解决方案
对于每个游戏资源的加载,都需要调用一个任务来执行,并且放到后台中去运行。
当所有资源加载完毕,再运行后续的任务。
我们可以将加载任务放到后台队列中,然后在主队列中执行一个任务,等待所有资
源加载完成。也就是说,所有的图片都在后台加载,当所有图片加载完成才运行主
队列中的代码:
let imagesToLoad = ["Image 1.jpg", "Image 2.jpg", "Image 3.jpg"]
let imageLoadingQueue = OperationQueue()
//
我们想让主队列不受影响,正常运行,
//
因此将后台队列标识为在后台执行
//
(注意:实际上默认就是在后台执行的,我们
//
这样做无非是演示一下
qulityOfService
属性的使用)
imageLoadingQueue.qualityOfService = QualityOfService.background
//
一次加载多张图片
imageLoadingQueue.maxConcurrentOperationCount = 10
//
创建一个任务,用于在所有图片加载完成后执行,
//
你可以根据需要进行修改
let loadingComplete = BlockOperation { () -> Void in
print("Loading complete!")
}
//
创建一个数组,用于保存所有任务
var ...
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Publisher Resources

ISBN: 9787519840129