如何在iOS SWIFT中将UIImage从框架回调到示例项目？

我试图回UIImage，这是我捕捉到的。打印时，捕获的图像打印成功，但在回调中，图像为零。不知道我在哪里犯错。

以下是框架代码：

public var imageCallBack: ((UIImage) -> ())? 

  public func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {
    guard scan.pageCount >= 1 else {
        controller.dismiss(animated: true)
        return
    }

    let originalImage = scan.imageOfPage(at: 0)
    self.imageView.image = originalImage
    let newImage = compressedImage(originalImage)
    print("new image::\(newImage.size)")
    imageNew = newImage
    print("image new", imageNew!)
    imageCallBack?(newImage)

    print("image call back", imageCallBack?(newImage) as Any)
    controller.dismiss(animated: true)

}


    @IBAction func saveBtn(_ sender: Any) {

    if let img = imageView.image {

        imageNew = img
        print("image new1", imageNew!)

        print("call back",imageCallBack!(imageNew!))

    }

    self.removeFromParent()
    self.view.removeFromSuperview()
}

下面是代码示例项目。在这里，我试图从框架中获取图像：

override func viewDidAppear(_ animated: Bool) {

 let vc1 = ScannerViewController()

         vc1.imageCallBack = { [weak self] image in

          print("result image", image)

         }
}

任何帮助，非常感谢.