在Swift中对图像进行分类时使用completionHandler返回打印内容

Question

我是Swift的新手，正在关注有关如何为IOS开发图像识别应用程序的教程。我相信我快要完成了，但是我在Xcode中不断收到错误消息，说“调用中缺少参数'completionHandler'的参数。

我已经阅读了有关此错误的其他主题，但不知道如何将提示应用于我自己的代码。我目前正在使用'success：'告诉应用程序是否有成功的标识返回图像分类，但是从我在互联网上阅读的内容来看，应该使用completionHandler来完成。

下面是我的代码，希望能得到一些有关如何解决问题的建议。

import UIKit
import VisualRecognitionV3

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    let apiKey = "plxmWfJup7nEkQOwFUTPt9AVMGNd-RYoNK8TLTM_lxq6"
    let version = "26-01-19"



    @IBOutlet weak var cameraButton: UIBarButtonItem!
    @IBOutlet weak var imageView: UIImageView!

    let imagePicker = UIImagePickerController()

    override func viewDidLoad() {
        super.viewDidLoad()

        imagePicker.delegate = self
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {

            imageView.image = image

            imagePicker.dismiss(animated: true, completion: nil)

            let visualRecognition = VisualRecognition(version: version, apiKey: apiKey)

            let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!

            let jpegData = image.jpegData(compressionQuality: 0.01)

            let fileURL = documentsURL.appendingPathComponent("tempImage.jpg")

            try? jpegData?.write(to: fileURL, options: [])

            visualRecognition.classify(imageFile: fileURL, success: { (classifiedImages) -> Void in
                print(classifiedImages)
            })

        }
        else{
            print("There was an error picking the image")
        }
    }

    @IBAction func cameraTapped(_ sender: UIBarButtonItem) {

        imagePicker.sourceType = .savedPhotosAlbum
        imagePicker.allowsEditing = false

        present(imagePicker, animated: true, completion: nil)
    }
}

我也是堆栈溢出的新手，所以如果我没有正确插入代码，我深表歉意。

谢谢。

编辑：

我使用以下代码解决了这个问题：

 if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {

        imageView.image = image

        imagePicker.dismiss(animated: true, completion: nil)

        let visualRecognition = VisualRecognition(version: version, apiKey: apiKey)

        let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!

        let imageData = image.jpegData(compressionQuality: 0.5)

        let imageURL = documentsURL.appendingPathComponent("tempImage.jpg")

        try? imageData?.write(to: imageURL, options: [])

        visualRecognition.classify(imagesFile: imageURL) { response, error in
            if let error = error {
                print(error)
            }
            guard let classifiedImages = response?.result else {
                print("Failed to classify the image")
                return
            }
            let classes = classifiedImages.images.first!.classifiers.first!.classes

            for index in 0..<classes.count{
                self.classificationResults.append(classes[index].className)
            }

            print(self.classificationResults)

            if self.classificationResults.contains("hotdog"){
                DispatchQueue.main.async {
                    self.navigationItem.title = "Hotdog!"
                }
            }
            else{
                DispatchQueue.main.async {
                    self.navigationItem.title = "Not Hotdog!"
                }
            }
        }
    }
}

@IBAction func cameraTapped(_ sender: UIBarButtonItem) {

    imagePicker.sourceType = .savedPhotosAlbum
    imagePicker.allowsEditing = false

    present(imagePicker, animated: true, completion: nil)


}