摘要：
1.CAShapeLayer：适用于虚线的动态显示。通过控制添加虚线视图的ishidden来控制虚线的显示和隐藏///绘制虚线///-Parameters:///-lineView:添加虚线视图///-strokeColor:虚线颜色///-lineWidth:虚线宽度///-line长度：每个虚线段的长度///-leneSpacing:每个虚线的间隔privatefuncdrawDas
1. CAShapeLayer:适用于 动态显示 虚线， 通过控制添加虚线view的 ishidden 控制虚线的显示隐藏
///绘制虚线 ///- Parameters: ///- lineView: 添加虚线的view ///- strokeColor: 虚线颜色 ///- lineWidth: 虚线宽度 ///- lineLength: 每段虚线的长度 ///- lineSpacing: 每段虚线的间隔 privatefunc drawDashLine(lineView:UIView, strokeColor: UIColor, lineWidth: CGFloat = 0.5, lineLength: Int = 4, lineSpacing: Int = 4) { let shapeLayer =CAShapeLayer() shapeLayer.bounds =lineView.bounds shapeLayer.position = CGPoint(x: lineView.width/2, y: lineView.height/2) shapeLayer.fillColor =UIColor.blue.cgColor shapeLayer.strokeColor =strokeColor.cgColor shapeLayer.lineWidth =lineWidth shapeLayer.lineJoin =CAShapeLayerLineJoin.round shapeLayer.lineDashPhase = 0 //每一段虚线长度 和 每两段虚线之间的间隔 shapeLayer.lineDashPattern =[NSNumber(value: lineLength), NSNumber(value: lineSpacing)] let path =CGMutablePath()
///起点 path.move(to: CGPoint(x: lineView.width/2, y: 0))
///终点 ///横向 y = 0 //path.addLine(to: CGPoint(x: 0, y: 0)) ///纵向 Y = view 的height path.addLine(to: CGPoint(x: lineView.frame.width/2, y: lineView.frame.height)) shapeLayer.path =path lineView.layer.addSublayer(shapeLayer) }
2.UIGraphicsGetCurrentContext绘制 需要在draw 方法使用
overridefunc draw(_ rect: CGRect) { super.draw(rect) guard let context = UIGraphicsGetCurrentContext() else{ return} self.drawBgView(context: context, rect: rect) //设置左右半圆 let radius: CGFloat = 6let centerY: CGFloat = rect.height - 49self.drawCircle(context: context, rect: rect, centerY: centerY, radius: radius) //设置水平方向半圆中心虚线 let h_startPoint: CGPoint = CGPoint(x: radius + 8, y: centerY ) let h_endPoint: CGPoint = CGPoint(x: rect.width - (radius + 8), y: centerY) self.drawDashLin(startPoint: h_startPoint, endPoint: h_endPoint, context: context) if isPriceView == false{ ///优惠券与迎新券分割虚线 let s_stasrtPoint: CGPoint = CGPoint(x: 16, y: 70) let s_endPoint: CGPoint = CGPoint(x: rect.width - 16, y: 70) self.drawDashLin(startPoint: s_stasrtPoint, endPoint: s_endPoint, context: context) } } privatefunc addShadow() { self.layer.shadowColor = UIColor(hexString: "000000").withAlphaComponent(0.1).cgColor self.layer.shadowOffset = CGSize( 0, height: 0) self.layer.shadowOpacity = 1self.layer.shadowRadius = 5} ///绘制阴影view privatefunc drawBgView(context: CGContext , rect: CGRect) { context.saveGState() //设置填充色 UIColor.white.set() context.addPath(UIBezierPath(roundedRect: rect, cornerRadius: 10).cgPath) context.fillPath() context.restoreGState() } ///绘制左右半圆 privatefunc drawCircle(context: CGContext , rect: CGRect , centerY: CGFloat , radius: CGFloat) { //1.设置圆心位置 let leftCenter: CGPoint = CGPoint(x: 0, y: centerY) let rightCenter: CGPoint =CGPoint(x: rect.width, y: centerY) context.saveGState() //2.设置路径 let leftPath = UIBezierPath(arcCenter: leftCenter, radius: radius, startAngle: -CGFloat.pi/2, endAngle: CGFloat.pi * 1.5, clockwise: true) let rightPath = UIBezierPath(arcCenter: rightCenter, radius: radius, startAngle: CGFloat.pi/2, endAngle: CGFloat.pi * 1.5, clockwise: true) context.setBlendMode(.clear) context.setLineWidth(1) context.addPath(leftPath.cgPath) context.addPath(rightPath.cgPath) context.fillPath() context.restoreGState() } ///绘制虚线 privatefunc drawDashLin(startPoint: CGPoint , endPoint: CGPoint , context: CGContext) { context.saveGState() let path =CGMutablePath() path.move(to: startPoint) path.addLine(to: endPoint) context.addPath(path) context.setStrokeColor(UIColor(hexString: "CDCDCD").cgColor) context.setLineWidth(1) context.setLineDash(phase: 0, lengths: [3 , 3]) context.strokePath() context.restoreGState() }