Created
April 13, 2015 03:48
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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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