Creating particles with CAEmitterLayer

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The CAEmitterLayer class provides a particle emitter system for Core Animation. The particles are defined by instances of CAEmitterCell.

The particles are drawn above the layer’s background color and border.

var emitter = CAEmitterLayer()

emitter.emitterPosition = CGPoint(x: frame.size.width / 2.0, y: -20)
emitter.emitterShape = kCAEmitterLayerLine
emitter.emitterSize = CGSize(width: frame.size.width, height: 1)

emitter.emitterCells = cells
layer.addSublayer(emitter)

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