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我正在研究类似于this video tutorial中所述的以SpriteKit/Swift 2.2为目标的iOS 9.3的类爆炸粒子系统。为什么工作粒子系统只有一次?
我(简化)代码:
let emiExplode = SKEmitterNode(fileNamed: "ExplosionParticleSystem.sks")
private func initEmitters() {
emiExplode?.particleBirthRate = 0.0
emiExplode?.targetNode = scene
emiExplode?.zPosition = 1
scene.addChild(emiExplode!)
}
private func explode() {
emiExplode?.position = self.position
emiExplode?.particleBirthRate = 2000.0
// remove explosion particle system shortly after
let action = SKAction.sequence([SKAction.waitForDuration(1.5),
SKAction.runBlock({ self.emiExplode?.particleBirthRate = 0 })])
emiExplode?.runAction(action)
}
我第一次打电话爆炸()它就像一个魅力。但第二次,粒子效应是不可见的...
任何想法?