清除VNDocumentCameraScan Swift中的扫描图像缓存

Question

我曾使用视觉套件进行文件扫描。我可以扫描并保存文档，但在关闭后返回到此屏幕后，旧的扫描图像显示在屏幕的左下角。下课后如何清除扫描阵列？

代码：

let vc = VNDocumentCameraViewController()

override func viewDidLoad() {
     super.viewDidLoad() 
     vc.delegate = self 
}

//Save button action in document VC

    func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {
            print("Found \(scan.pageCount)")
            var imgArray: Array<UIImage> = []
            for i in 0 ..< scan.pageCount {
                let image = scan.imageOfPage(at: i)
                imgArray.append(image)
            }
            dismiss(animated: true) {
                self.getFileName(img: imgArray)
            }
        }

Marked the scanned images icon at the bottom left

Answer 1

看起来，您在视图控制器对象的vc常量中保持与VNDocumentCameraViewController实例的链接。当您第二次显示它时，相同的实例将被重用。

试着这样创建和呈现它：

func showDocumentCamera() {
   let vc = VNDocumentCameraViewController()
   vc.delegate = self
   present(vc, animated: true)
}