在图像前面绘制UIView

Question

我试图编写一个应用程序代码，该应用程序部分涉及使用手指跟踪照片中的对象。我有两个相关文件：

import UIKit

class SecondViewController: UIViewController {


    @IBOutlet weak var image_edit: UIImageView!




    var rec_houseimages: [UIImage]?



    override func viewDidLoad() {

        super.viewDidLoad()
        image_edit.image = rec_houseimages?[0]

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }




}

和这一个：

import UIKit

class Draw: UIView {


    var touch : UITouch!
    var lineArray : [[CGPoint]] = [[CGPoint]()]
    var index = -1


    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {


        touch = touches.first! as UITouch
        let lastPoint = touch.location(in: self)

        index += 1
        lineArray.append([CGPoint]())
        lineArray[index].append(lastPoint)
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        touch = touches.first! as UITouch
        let currentPoint = touch.location(in: self)

        self.setNeedsDisplay()

        lineArray[index].append(currentPoint)

    }



    override func draw(_ rect: CGRect) {

        let context = UIGraphicsGetCurrentContext()

        if(index >= 0){

            context!.setLineWidth(5)
            context!.setStrokeColor((UIColor(red:0.00, green:0.38, blue:0.83, alpha:1.0)).cgColor)
            context!.setLineCap(.round)

            var j = 0
            while( j <= index ){
                context!.beginPath()
                var i = 0
                context?.move(to: lineArray[j][0])
                while(i < lineArray[j].count){
                    context?.addLine(to: lineArray[j][i])
                    i += 1
                }

                context!.strokePath()
                j += 1

            }

            }


        }

当我运行程序时，我将所需的图像放在屏幕上，绘图代码执行正常;但是图像位于图形的前面，因此如果您在图像外部绘制，则只能看到线条。我一直在查看诸如带上SubviewToFront之类的内容，但我不知道如何用这个绘图来实现它们。