1.实现

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//MARK:- 绘制虚线
/**
 * 绘制虚线
 */
func drawDottedLine(_ rect: CGRect, _ radius: CGFloat, _ color: UIColor) {
    let layer = CAShapeLayer()
    layer.bounds = CGRect(x: 0, y: 0, width: rect.width, height: rect.height)
    layer.position = CGPoint(x: rect.midX, y: rect.midY)
    layer.path = UIBezierPath(rect: layer.bounds).cgPath
    layer.path = UIBezierPath(roundedRect: layer.bounds, cornerRadius: radius).cgPath
    layer.lineWidth = 1/UIScreen.main.scale
    //虚线边框
    layer.lineDashPattern = [NSNumber(value: 5), NSNumber(value: 5)]
    layer.fillColor = UIColor.clear.cgColor
    layer.strokeColor = color.cgColor
    
    self.layer.addSublayer(layer)
}

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2.使用方法

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let view1 = UIView(frame: CGRect(x: 50, y: 100, width: 300, height: 30))
view1.backgroundColor = UIColor.white
view1.drawDottedLine(view1.bounds, 7, UIColor.gray)
view.addSubview(view1)

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31305B6A-6631-4E30-95D4-0D4DAEA256F4.png