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- import UIKit
- import QuartzCore
- class SnowView: UIView {
- override init(frame: CGRect) {
- super.init(frame: frame)
- let emitter = layer as CAEmitterLayer
- emitter.emitterPosition = CGPoint(x: bounds.size.width / 2, y: 0)
- emitter.emitterSize = bounds.size
- emitter.emitterShape = kCAEmitterLayerRectangle
- let emitterCell = CAEmitterCell()
- emitterCell.contents = UIImage(named: "flake.png")!.CGImage
- emitterCell.birthRate = 200
- emitterCell.lifetime = 3.5
- emitterCell.color = UIColor.redColor().CGColor
- emitterCell.redRange = 0.0
- emitterCell.blueRange = 0.1
- emitterCell.greenRange = 0.0
- emitterCell.velocity = 10
- emitterCell.velocityRange = 350
- emitterCell.emissionRange = CGFloat(M_PI_2)
- emitterCell.emissionLongitude = CGFloat(-M_PI)
- emitterCell.yAcceleration = 70
- emitterCell.xAcceleration = 0
- emitterCell.scale = 0.33
- emitterCell.scaleRange = 1.25
- emitterCell.scaleSpeed = -0.25
- emitterCell.alphaRange = 0.5
- emitterCell.alphaSpeed = -0.15
- emitter.emitterCells = [emitterCell]
- }
- required init(coder aDecoder: NSCoder) {
- fatalError("init(coder:) has not been implemented")
- }
- override class func layerClass() -> AnyClass {
- return CAEmitterLayer.self
- }
- }
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