Swift VNRecognizeTextRequest:传递给不带参数的调用的参数

Question

目前，我正在使用SWIFT5.4构建一个小型CLI工具，并希望使用“视觉框架”来提取图像中的所有文本。我为完成这一任务而写的这篇文章是由苹果公司提供的，可以找到这里。如您所见，我的代码与Apple提供的示例相同，目前无法工作。

这是编译错误：

error: argument passed to call that takes no arguments
        let request = VNRecognizeTextRequest(completion: recognizeTextRequestHandler)

这是带有VNRecognizeTextRequest类的代码，在那里，recognizeTextRequestHandler函数被传递给构造函数来处理结果。

@available(macOS 10.13, *)
    public func run() throws {
        // Get the image from argument and create a UIImage
        let file = try Files.File.init(path: arguments[1]).read()
        guard let image = UIImage(data: file)?.cgImage else { return }
        
        
        // request
        let imageRequestHandler = VNImageRequestHandler(cgImage: image)
        // pass handler to process the result
        let request = VNRecognizeTextRequest(completion: recognizeTextRequestHandler)
        
        do {
            // Perform the text-recognition request.
            try imageRequestHandler.perform([request])
        } catch {
            print("Unable to perform the requests: \(error).")
        }
    }

传递给VNRecognizeTextRequest的函数

@available(macOS 10.13, *)
func recognizeTextRequestHandler(request: VNRequest, error: Error?){
    if #available(macOS 10.15, *) {
        guard let observations =
                request.results as? [VNRecognizedTextObservation] else {
            return
        }
        let recognizedStrings = observations.compactMap { observation in
                // Return the string of the top VNRecognizedText instance.
                return observation.topCandidates(1).first?.string
            }
            
            // Process the recognized strings.
            print(recognizedStrings)
    } else {
        exit(EXIT_FAILURE)
    }

谢谢您抽时间见我!如有不清楚之处，请评论。

Answer 1

这篇文章已经过时了--应该是completionHandler，而不是completion。取代：

let request = VNRecognizeTextRequest(completion: recognizeTextRequestHandler)

..。通过以下方式：

let request = VNRecognizeTextRequest(completionHandler: recognizeTextRequestHandler)

Answer 2

使用此构造函数

let request = VNRecognizeTextRequest(completionHandler: recognizeTextRequestHandler)