使用Vision框架为你的应用程序添加文本识别功能。

相关文档说明：

 Recognizing Text in Images
 Locating and Displaying Recognized Text

代码实现：

import Cocoa
import Vision

class ImageAnalysis {
    static let shared = ImageAnalysis()
    
    // default language
    var languages: [String] = ["zh-Hans"]
    
    func loadImage(_ image: NSImage?, completion: @escaping (_ text: String?) -> Void) {
        guard let image = image?.cgImage(forProposedRect: nil, context: nil, hints: nil) else {
            completion(nil)
            return
        }
        
        
        let request = VNRecognizeTextRequest { request, error in
            if let error = error {
                print("Error detecting text: \(error)")
                completion(nil)
            } else {
                if let result = self.handleDetectionResults(results: request.results) {
                    completion(result)
                } else {
                    completion(nil)
                }
            }
        }
        
        request.recognitionLanguages = languages
        request.recognitionLevel = .accurate
        
        performDetection(request: request, image: image)
    }
    
    private func performDetection(request: VNRecognizeTextRequest, image: CGImage) {
        request.cancel()
        
        let requests = [request]
        let handler = VNImageRequestHandler(cgImage: image, orientation: .up, options: [:])
        
        DispatchQueue.global(qos: .userInitiated).async {
            do {
                try handler.perform(requests)
            } catch {
                print("Error: \(error)")
            }
        }
    }
    
    private func handleDetectionResults(results: [Any]?) -> String? {
        guard let results = results, results.count > 0 else {
            return nil
        }
        
        var output: String = ""
        for result in results {
            if let observation = result as? VNRecognizedTextObservation {
                for text in observation.topCandidates(1) {
                    if !output.isEmpty {
                        output.append("\n")
                    }
                    output.append(text.string)
                }
            }
        }
        return output
    }
    
    func showSupportsLanguages() -> [String] {
        do {
            
            let revision = VNRecognizeTextRequest.supportedRevisions.last
            
            let supportsLanguages = try VNRecognizeTextRequest.supportedRecognitionLanguages(for: .accurate, revision: revision ?? 2)
            return supportsLanguages
        } catch {
            print("error: ", error)
        }
        
        return ["en-US"]
    }
}

如何使用：

// show the supportlanagues
let result = ImageAnalysis.shared.showSupportsLanguages()
print("result: ", result)
/**
* result:
* ["en-US", "fr-FR", "it-IT", "de-DE", "es-ES", "pt-BR", "zh-Hans", "zh-Hant"]
*/

// get the text from image
ImageAnalysis.shared.loadImage(image) { transcript in
    print("transcript: ", transcript)
}