class WaveView: UIView {var firstWaveColor = UIColor() // 第一个波浪颜色var secondWaveColor = UIColor() // 第二个波浪颜色var waveDisplaylink : CADisplayLink!var firstWaveLayer : CAShapeLayer! // 第一个波浪var secondWaveLayer : CAShapeLayer! // 第二个波浪var waveAmplitude : CGFloat = 0.0 // 波纹振幅var waveCycle : CGFloat = 0.0 // 波纹周期var waveSpeed : CGFloat = 0.0 // 波纹速度var offsetX : CGFloat = 0.0 // 波浪 x 位移var currentWavePointY : CGFloat = 0.0 // 当前波浪上市高度Y（高度从大到小 坐标系向下增长var variable : Float = 0.0 // 可变参数 更加真实 模拟波纹var increase : Bool = true // 增减变化var waterWaveWidth : CGFloat = 0.0 // 水波宽度override func awakeFromNib() {super.awakeFromNib()setUp()}override init(frame: CGRect) {super.init(frame: frame)setUp()}required init?(coder aDecoder: NSCoder) {super.init(coder: aDecoder)setUp()}private func setUp() {self.backgroundColor = UIColor.clearColor()firstWaveColor = UIColor.whiteColor()secondWaveColor = UIColor.whiteColor()dispatch_async(dispatch_queue_create("myQueue", DISPATCH_QUEUE_SERIAL)) {self.startWave()}waveCycle =  2 * CGFloat(M_PI) / self.frame.size.widthwaterWaveWidth = UIScreen.mainScreen().bounds.size.width + 10waveSpeed = CGFloat(0.05 / M_PI)currentWavePointY = 0variable = 1.6increase = falseoffsetX = 0}func startWave() {if firstWaveLayer == nil {// 创建第一个波浪firstWaveLayer = CAShapeLayer()firstWaveLayer.fillColor = firstWaveColor.CGColorfirstWaveLayer.opacity = 0.3self.layer.addSublayer(firstWaveLayer)}if secondWaveLayer == nil {// 创建第二个波浪secondWaveLayer = CAShapeLayer()secondWaveLayer.fillColor = secondWaveColor.CGColorself.layer.addSublayer(secondWaveLayer)}if waveDisplaylink == nil {// 启动调用定时器waveDisplaylink = CADisplayLink(target: self, selector: #selector(getCurrentWave(_:)))waveDisplaylink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)}}@objc private func getCurrentWave(displayLink: CADisplayLink) {
//        这里是调整波浪状态，自行发挥
//        if (increase) {
//            variable += 0.01
//        } else {
//            variable -= 0.01
//        }
//        if (variable <= 1) {
//            increase = true
//        }
//
//        if (variable >= 1.6) {
//            increase = false
//        }waveAmplitude = CGFloat(variable * 2.5)offsetX += waveSpeedsetCurrentFirstWaveLayerPath()setCurrentSecondWaveLayerPath()}private func setCurrentFirstWaveLayerPath() {let path = CGPathCreateMutable()var y = currentWavePointYvar x : CGFloat = 0.0CGPathMoveToPoint(path, nil, 0, 0)while (true) {y = waveAmplitude * sin(waveCycle * x + offsetX) + currentWavePointYCGPathAddLineToPoint(path, nil, x, y)x += 1if x >= waterWaveWidth {break}}CGPathAddLineToPoint(path, nil, waterWaveWidth, self.frame.size.height)CGPathAddLineToPoint(path, nil, 0, self.frame.size.height)CGPathCloseSubpath(path)firstWaveLayer.path = path}private func setCurrentSecondWaveLayerPath() {let path = CGPathCreateMutable()var y = currentWavePointYvar x : CGFloat = 0.0CGPathMoveToPoint(path, nil, 0, 0)while (true) {y = waveAmplitude * cos(waveCycle * x + offsetX) + currentWavePointYCGPathAddLineToPoint(path, nil, x, y)x += 1if x >= waterWaveWidth {break}}CGPathAddLineToPoint(path, nil, waterWaveWidth, self.frame.size.height)CGPathAddLineToPoint(path, nil, 0, self.frame.size.height)CGPathCloseSubpath(path)secondWaveLayer.path = path}deinit {reset()}private func reset() {if firstWaveLayer != nil {firstWaveLayer.removeFromSuperlayer()firstWaveLayer = nil}if secondWaveLayer != nil {secondWaveLayer.removeFromSuperlayer()secondWaveLayer = nil}}}
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