swift 给view绘制虚线

1.实现

    //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)
    }

2.使用方法

    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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