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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2D
图形和
Sprite Kit
｜
213
override func update(_ currentTime: TimeInterval) {
//
首先，计算每帧耗时，
//
如果
lastFrameTime
为
0
，说明这是第一帧
//
这样的帧耗时为
0
if lastFrameTime <= 0 {
lastFrameTime = currentTime
}
//
计算帧耗时
deltaTime = currentTime - lastFrameTime
//
然后重新将
lastFrameTime
设置为当前时间
lastFrameTime = currentTime
//
然后逐一移动
4
个精灵对。
//
其中，后面的精灵对的移动速度要慢于前面的
self.move(sprite: skyNode, nextSprite:skyNodeNext, speed:25.0)
self.move(sprite: distantHillsNode, nextSprite:distantHillsNodeNext,
speed:50.0)
self.move(sprite: hillsNode, nextSprite:hillsNodeNext, speed:100.0)
self.move(sprite: pathNode, nextSprite:pathNodeNext, ...
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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.