粒子系统
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加载粒子文件
import SpriteKit
import GameplayKit
class GamePartical: SKScene {
var snow :SKEmitterNode!
override func didFinishUpdate() {
self.size = UIScreen.main.bounds.size
snow = SKEmitterNode(fileNamed: "snow.sks")
snow.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
self.addChild(snow!)
}
}
创建粒子.png
粒子编辑器
模拟器效果
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代码创建
import SpriteKit
import GameplayKit
class GamePartical: SKScene {
var emitter : SKEmitterNode!
override func didMove(to view: SKView) {
let rainTexture = SKTexture(imageNamed: "zombie1")
emitter = SKEmitterNode()
emitter.particleTexture = rainTexture
emitter.particleBirthRate = 10
emitter.particleColor = UIColor.white
emitter.particleSpeed = -450
emitter.particleScaleRange = 150
emitter.particleLifetime = 2
emitter.particleScale = 0.2
emitter.particleScaleRange = 0.5
emitter.particleAlpha = 0.7
emitter.particleAlphaRange = 0.5
emitter.emissionAngle = 0
emitter.emissionAngleRange = CGFloat.pi * 2
emitter.particleColorBlendFactor = 1
emitter.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
self.addChild(emitter)
}
}
粒子效果
PS : 太多的粒子会大量占用系统资源,让游戏变卡,所以使用时要注意
使用关键帧序列配置粒子属性
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let scaleSequence = SKKeyframeSequence(keyframeValues: [0.2,0.9,0.1], times: [0.0, 0.5, 0.75])
emitter.particleScaleSequence = scaleSequence
}
关键帧序列配置粒子属性
PS : 也就是改变粒子的运动内容.
为粒子添加动作
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使用SKAction方式
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let moveAction = SKAction.moveBy(x: 300, y: 0, duration: 1)
emitter.run(moveAction)
}
移动效果
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使用partcleAction属性添加动作
let color = SKAction.colorize(with: SKColor.green, colorBlendFactor: 0.5, duration: 1)
emitter.particleAction = color
PS : 测试了N遍,貌似用这个动作添加没有效果. 有可能是我的操作方式不对.原教材也是一样,没有效果,不会变颜色.玛德,坑爹.这种方式暂时不考虑,可能有坑
清屏操作
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
emitter.resetSimulation()
}
清屏操作
