将图像保存到相机胶卷时应用程序崩溃

Question

当我尝试将扫描件保存到相机胶卷时，应用程序崩溃了

代码如下：

func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {
    // Make sure the user scanned at least one page
    guard scan.pageCount >= 1 else {

        // You are responsible for dismissing the VNDocumentCameraViewController.
        controller.dismiss(animated: true)
        return
    }

    // This is a workaround for the VisionKit bug which breaks the `UIImage` returned from `VisionKit`
    // See the `Image Loading Hack` section below for more information.

    var arrImages = [UIImage]()
    for i in 0...scan.pageCount-1 {
        let originalImage = scan.imageOfPage(at: i)
        let fixedImage = reloadedImage(originalImage)
        arrImages.append(fixedImage)
    }

    controller.dismiss(animated: true)

    let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let docURL = documentDirectory.appendingPathComponent("Delete This")

    if Filetype == 1 {
        let data = createNewPDF(arrImage: arrImages)
        do {
            try data?.write(to: docURL, options: .completeFileProtection)
            print("Success")

        } catch(let error) {
            print("error is \(error.localizedDescription)")
        }
    } else {
        if Filetype == 2 {

            if customjg == 68 {
                for i in 0...scan.pageCount-1 {
                    let originalImage = scan.imageOfPage(at: i)
                    let fixedImage =  originalImage.jpegData(compressionQuality: 0.7)
                    let reloadedImage = UIImage(data: fixedImage!)
                    UIImageWriteToSavedPhotosAlbum(reloadedImage!, nil, nil, nil);
                    //arrImages.append(fixedImage)
                }
                if customjg == 69 {

                    let originalImage = scan.imageOfPage(at: 1)
                    let rere =  self.resizeImagezz(image: originalImage, targetSize: CGSize(width: Widthv, height: Heightv))
                    let fixedImage = rere.jpegData(compressionQuality: 0.7)
                    let reloadedImage = UIImage(data: fixedImage!)
                    UIImageWriteToSavedPhotosAlbum(reloadedImage!, nil, nil, nil);
                    //arrImages.append(fixedImage)
                }

            }
        }else{
            if Filetype == 3 {
                for i in 0...scan.pageCount-1 {
                    let originalImage = scan.imageOfPage(at: i)
                    let fixedImage =  originalImage.pngData()
                    let reloadedImage = UIImage(data: fixedImage!)
                    UIImageWriteToSavedPhotosAlbum(reloadedImage!, nil, nil, nil);
                    //arrImages.append(fixedImage)
                }
            }
        }
    }
}

文件类型是段控制开关盒。默认情况下，第一个选项是 JPEG。它在崩溃之前甚至不要求相机胶卷访问权限（是的，我已经把它放在 info.plist 文件中）。

目前只有 PDF 可用。

但不同之处在于，安装在 iOS 14 Beta 上时一切正常。

请尽快帮我解决这个问题。

感谢您提前的帮助。

Answer 1

根据文档 - https://developer.apple.com/documentation/uikit/1619125-uiimagewritetosavedphotosalbum，我们应该实施completionSelector。并且对于与自己相同的集合 completionTarget。实施 api 如下：

UIImageWriteToSavedPhotosAlbum(reloadedImage!, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)

然后在这个completionSelector中：

@objc func image(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
    guard let error = error else {//success return}
    // found error
    print(error)
}

将图像保存到相机胶卷时应用程序崩溃

App Crashes When saving image to camera roll

swift

visionkit