如何在 iOS Swift 中将图像从框架发送到示例项目？

Question

我已经使用visionKit 实现了文档扫描仪。 最初我遇到了相机关闭问题并且它已修复。 现在我试图在相机从框架中关闭后将图像发送到示例项目。

我曾尝试使用完成处理程序，但它不起作用。

这是框架的代码：

public class A8Scan: NSObject, VNDocumentCameraViewControllerDelegate {

var imageNew: UIImage?
var statusImage: UIImageView?
private var clientView: UIViewController?
public init(_ viewController:UIViewController){

          self.clientView = viewController

   }

public func showScanner(imgData: UIImage?){

    self.createTaskController(img: imgData)

       print("Called Build")


 }

private func createTaskController(img: UIImage?){

     let scannerViewController = VNDocumentCameraViewController()
     scannerViewController.delegate = self
    self.clientView?.present(scannerViewController,animated:true,completion:  {

            self.imageNew = img

    })


 }

public func imageFromFile(result: @escaping (_ image: UIImage?) -> Void){

         //the image
    let scannerViewController = VNDocumentCameraViewController()
    scannerViewController.delegate = self
    self.clientView?.present(scannerViewController,animated:true,completion: nil)

     if imageNew != nil {

         result(imageNew)
         }
         else{
             //callback nil so the app does not pause infinitely if
             //the error != nil
         result(nil)
         }

 }

func set(image: UIImage) {

    self.statusImage?.image = image

}

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

        let originalImage = scan.imageOfPage(at: 0)
        let newImage = compressedImage(originalImage)
        imageNew = newImage
        set(image: imageNew!)
        print("new image::\(newImage.size)")
        controller.dismiss(animated: true, completion: nil)

//        processImage(newImage)
    }

    public func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFailWithError error: Error) {
        print(error)
        controller.dismiss(animated: true)
    }

    public func documentCameraViewControllerDidCancel(_ controller: VNDocumentCameraViewController) {
        controller.dismiss(animated: true)
    }

    func compressedImage(_ originalImage: UIImage) -> UIImage {
        guard let imageData = originalImage.jpegData(compressionQuality: 1),

            let reloadedImage = UIImage(data: imageData) else {

                return originalImage
        }
        return reloadedImage
    }

 }

这是代码示例项目：

     @IBAction func btnAction(_ sender: Any) {

 //        A8Scan(self).showScanner()
 //        A8Scan(self).showScanner(imgData: im)
 //        print("nn", A8Scan(self).showScanner(imgData: im))

    A8Scan(self).imageFromFile { (image) in

        if image != nil {

            print(image!)
        } else {

            print("something went wrong")
        }
    }
//        p()
}

func p (){
    ScannerViewController().imageFromFile{(image: UIImage?) -> Void in
        //use the image that was just retrieved

        print("image data", image)
    }
}

我的问题是从框架中关闭相机后，它不会将图像从框架发送到示例项目。

任何帮助非常感谢请....

Answer 1

1- 在您的框架中添加它

var callBack((UIImage)-())?

 public func show() { 
   let scannerViewController = VNDocumentCameraViewController()
   scannerViewController.delegate = self 
   self.clientView?.present(scannerViewController,animated:true,completion: nil)
}

2-

let newImage = compressedImage(originalImage)
callBack?(newImage)

3-

然后在使用它的vc里面

let vc = A8Scan(self)
vc.show()
vc.callBack = { [weak self] image in

}

Answer 2

当您使用中间人 (A8Scan) NSObject 来呈现控制器时。 A8Scan 将在呈现控制器后立即解除分配，您可以通过在 A8Scan 中保留 deinit 功能来确认。

一种解决方法是将您的 NSObject (A8Scan) 作为单例，即添加

static let shared = A8Scan()
var callBack: ((_ image: UIImage?) -> Void)?

删除现有的 init 方法并将 viewcontroller 属性添加到imageFromFile:方法中，您的函数将如下所示

public func imageFromFile(sender: UIViewController, result: @escaping (_ image: UIImage?) -> Void){
   let scannerViewController = VNDocumentCameraViewController()
   scannerViewController.delegate = self
   self.callBack = result
   sender.present(scannerViewController,animated:true,completion: nil)
}

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

    let originalImage = scan.imageOfPage(at: 0)
    let newImage = compressedImage(originalImage)
    imageNew = newImage
    set(image: imageNew!)
    callBack?(imageNew!)
    controller.dismiss(animated: true, completion: nil)
}

最后在您的示例项目中，

 @IBAction func btnAction(_ sender: Any) {
  A8Scan.shared.imageFromFile(sender: self) { (image) in
     if image != nil {
         print(image!)
     } else {
         print("something went wrong")
     }
   }
 }