1. 实现
//MARK:- 绘制虚线
func drawDashLine(strokeColor: UIColor, lineWidth: CGFloat = 1, lineLength: Int = 10, lineSpacing: Int = 5, isBottom: Bool = true) {
let shapeLayer = CAShapeLayer()
shapeLayer.bounds = self.bounds
shapeLayer.anchorPoint = CGPoint(x: 0, y: 0)
shapeLayer.fillColor = UIColor.blue.cgColor
shapeLayer.strokeColor = strokeColor.cgColor
shapeLayer.lineWidth = lineWidth
shapeLayer.lineJoin = kCALineJoinRound
//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()
let y = isBottom == true ? self.layer.bounds.height - lineWidth : 0
path.move(to: CGPoint(x: 0, y: y))
path.addLine(to: CGPoint(x: self.layer.bounds.width, y: y))
shapeLayer.path = path
self.layer.addSublayer(shapeLayer)
}
2. 使用方法
let view1 = UIView(frame: CGRect(x: 50, y: 100, width: 300, height: 30))
view1.backgroundColor = UIColor.red
view1.drawDashLine(strokeColor: UIColor.black)
view.addSubview(view1)
