DrawPaths.swift

func getPathPayer(arrPathPoints:[CGPoint]) throws -> CAShapeLayer {
    enum PathError : Error{
        case moreThan2PointsNeeded
    }
    
    guard arrPathPoints.count > 2 else {
        throw PathError.moreThan2PointsNeeded
    }
    
    let lineColor = UIColor.blue
    let lineWidth: CGFloat = 2
    let path = UIBezierPath()
    let pathLayer = CAShapeLayer()
    
    for (index,pathPoint) in arrPathPoints.enumerated() {
        switch index {
        //First point
        case 0:
            path.move(to: pathPoint)
            
        //Last point
        case arrPathPoints.count - 1:
            path.addLine(to: pathPoint)
            path.close()
            
        //Middle Points
        default:
            path.addLine(to: pathPoint)
        }
    }
    
    pathLayer.path = path.cgPath
    pathLayer.strokeColor = lineColor.cgColor
    pathLayer.lineWidth = lineWidth
    pathLayer.fillColor = UIColor.red.cgColor
    
    return pathLayer
}

// Using 

 do {
            let rectangleLayer = try getPathPayer(arrPathPoints: [
                CGPoint(x: 110, y: 110),    //Top-Left
                CGPoint(x: 170, y: 110),    //Top-Right
                CGPoint(x: 130, y: 130),    //Bottom-Right
                CGPoint(x: 110, y: 130)])   //Bottom-Left
            
//            let view = UIView(frame: CGRect(x: 0, y: 0, width: 375, height: 200))
            view.layer.addSublayer(rectangleLayer)
            print( view)
        } catch {
            debugPrint(error)
        }