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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游戏的设计
｜
23
定时器可以仅触发一次，也可以触发无限次，只需要将
repeats
参数由
false
替换
为
true
即可。
1.8
每帧刷新
问题
我们想在屏幕每绘制一帧时，就刷新游戏状态。
解决方案
可以用
CADisplayLink
，它可以在屏幕每次重绘时发送消息给你。
首先，导入
QuartzCore
框架：
import QuartzCore
然后，在
View Controller
中声明一个实例变量：
var displayLink : CADisplayLink?
新增一个以一个
CADisplayLink
对象作为参数的方法：
@objc func screenUpdated(displayLink : CADisplayLink) {
//
进行游戏的刷新
}
最后，用以下代码开始接收屏幕重绘通知：
//
获得一个方法引用，当显示器刷新时执行这个方法
let screenUpdated = #selector(screenUpdated(displayLink:))
//
创建、启动
display link
displayLink = CADisplayLink(target: self, selector: screenUpdated)
displayLink?.add(to: RunLoop.main, forMode: RunLoop.Mode.common)
如果想暂停屏幕刷新通知，可以将
CADisplayLink
的
paused
属性设置为
true
：
//
暂停屏幕重绘通知
displayLink?.ispaused ...
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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.