Created
December 29, 2018 05:51
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Snow effect by emitter.
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| let emitterLayer = CAEmitterLayer() | |
| emitterLayer.frame = navigationView.bounds | |
| emitterLayer.renderMode = .oldestLast | |
| emitterLayer.emitterShape = .rectangle | |
| emitterLayer.emitterSize = CGSize(width: navigationView.bounds.width, height: navigationView.bounds.height / 2) | |
| emitterLayer.emitterPosition = CGPoint(x: navigationView.bounds.width / 2, y: 0) | |
| navigationView.layer.insertSublayer(emitterLayer, at: 0) | |
| let emitterCell = CAEmitterCell() | |
| emitterCell.contents = UIImage(named: "triangle1")?.cgImage | |
| emitterCell.birthRate = 2 | |
| emitterCell.lifetime = 5 | |
| emitterCell.lifetimeRange = 1 | |
| emitterCell.alphaSpeed = 5 | |
| emitterCell.alphaRange = 1 | |
| emitterCell.velocity = 50 | |
| emitterCell.velocityRange = 10 | |
| emitterCell.emissionLongitude = CGFloat.pi / 2 | |
| emitterCell.emissionLatitude = CGFloat.pi / 2 | |
| emitterCell.emissionRange = CGFloat.pi / 4 | |
| emitterCell.spin = 0.5 | |
| emitterCell.xAcceleration = 10 | |
| emitterCell.yAcceleration = 30 | |
| emitterCell.scale = 0.5 | |
| emitterCell.scaleSpeed = -0.15 | |
| emitterCell.scaleRange = 0.1 | |
| emitterLayer.emitterCells = [emitterCell] |
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