我想CAEmitterLayer在基于 SwiftUI 的 macOS 应用程序中使用 a 。
问题：图层本身是完全可见的，但它不发射任何粒子。
我基本上为处理发射器层本身NSViewRepresentable的自定义类构建了一个。EmitterNSView: NSView
final class EmitterNSView: NSView {
private let emitterLayer: CAEmitterLayer = {
let layer = CAEmitterLayer()
layer.backgroundColor = NSColor.green.withAlphaComponent(0.33).cgColor
return layer
}()
private let emitterCells: [CAEmitterCell] = {
// https://developer.apple.com/documentation/quartzcore/caemitterlayer
let cell = CAEmitterCell()
cell.name = "someParticle"
cell.birthRate = 10
cell.lifetime = 5.0
cell.velocity = 100
cell.velocityRange = 50
cell.emissionLongitude = 0.0
cell.emissionRange = CGFloat.pi * 2.0
cell.spinRange = 5
cell.scale = 1.0
cell.scaleRange = 0.25
cell.alphaSpeed = 0.25
cell.contents = NSImage(named: "whiteParticle.png")!.cgImage
cell.color = NSColor.systemPink.cgColor
cell.xAcceleration = 4
cell.yAcceleration = 3
cell.zAcceleration = 2
return [cell]
}()
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
self.wantsLayer = true
self.layer = CALayer()
self.layer?.autoresizingMask = [.layerWidthSizable, .layerHeightSizable]
self.configureEmitterLayer()
self.layer?.addSublayer(self.emitterLayer)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layout() {
super.layout()
self.configureEmitterLayer()
}
override func updateLayer() {
super.updateLayer()
self.configureEmitterLayer()
}
func configureEmitterLayer() {
self.emitterLayer.frame = self.frame
self.emitterLayer.autoresizingMask = [.layerHeightSizable, .layerWidthSizable]
self.emitterLayer.masksToBounds = false
self.emitterLayer.drawsAsynchronously = true
self.emitterLayer.emitterMode = .points
self.emitterLayer.birthRate = 2
self.emitterLayer.emitterShape = CAEmitterLayerEmitterShape.line
self.emitterLayer.emitterSize = CGSize(width: frame.width * 0.5, height: frame.height * 0.5)
self.emitterLayer.emitterPosition = CGPoint.zero
self.emitterLayer.renderMode = CAEmitterLayerRenderMode.additive
self.emitterLayer.emitterCells = self.emitterCells
self.emitterLayer.zPosition = 10
self.emitterLayer.beginTime = CACurrentMediaTime()
self.emitterLayer.speed = 1.5
self.emitterLayer.emitterCells = self.emitterCells
}
}
我可以清楚地看到应用程序中图层的绿色背景这一事实表明单元格有问题？在这一点上感觉很失落。
工作中非常相似的实现UIKit就好了。
如何CAEmitterLayer在基于 SwiftUI 的应用程序中的 macOS 上使用？