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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194
｜
第
6
章
6.9
移动精灵和标签
问题
我们想让精灵和文字标签在场景中移动。
解决方案
我们可以通过
SKAction
对象让场景中的节点执行某个动作。所谓的动作包括让场
景中的节点移动位置，改变颜色、透明度或大小。
下列代码让节点在向右上角移动的同时进行淡出，然后执行某些代码，最后从场景
中移除：
//
在这个示例中，节点可以是任意
SKNode
类
//
这个动作向上移动
100
像素，向右移动
100
像素，用时
1
秒
let moveUp = SKAction.move(by: CGVector(dx: 100, dy: 100), duration: 1.0)
//
这个动作是淡出
0.5
秒
let fadeOut = SKAction.fadeOut(withDuration: 0.5)
//
这个动作是执行一个代码块
let runBlock = SKAction.run {
println("Hello!")
}
//
这个动作是删除节点
let remove = SKAction.removeFromParent()
//
同步执行动作（组）：移动、淡出和代码块
let moveAndFade = SKAction.group([moveUp, fadeOut])
//
按顺序执行动作（序列）：先移动并淡出，然后执行代码块，最后删除节点
let sequence = SKAction.sequence([moveAndFade, runBlock, remove])
//
运行前面定义的所有 ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.