如何快速地将扫描保存到用户的照片库

Question

我已经尝试了很多解决方案，但它们根本不起作用

    extension ViewController: VNDocumentCameraViewControllerDelegate, UIImagePickerControllerDelegate {
    func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinish scan: VNDocumentCameraScan) {
        for pageNumber in 0..<scan.pageCount {
            let image = scan.imageOfPage(at: pageNumber)
            print(image)
            //save
            hasPhoto = true
            UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
            //UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
        }
        controller.dismiss(animated: true, completion: nil)
    }
}

Answer 1

步骤1：向.plist添加权限

<key>NSPhotoLibraryAddUsageDescription</key>
<string>DummyProject wants to access your photo library to save photo</string>

根据您的需要更改消息。

步骤2：确保您的图像不是0.

func saveImage(image: UIImage) {
    UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
}

步骤3:方法中的，检查错误：

@objc func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
    guard error == nil else {
        print(error ?? "Error in Image saving")
        return
    }
}

如果您有任何问题，请评论。很乐意帮忙！

Answer 2

对于pageNumber in 0..

        UIImage* im = [UIImage imageWithCGImage: image.CGImage]; // make image from CGRef
        
        NSData* imdata =  UIImagePNGRepresentation ( im ); // get PNG representation
        UIImage* im2 = [UIImage imageWithData:imdata]; // wrap UIImage around PNG representation
        UIImageWriteToSavedPhotosAlbum(im2, nil, nil, nil); // save to photo album
    }