xcodeで｢cannot find 'contentview' in scope｣というエラーが出る

実現したいこと

｢Cannot find 'ContentView' in scope｣を解決する

前提

本をカメラに映して、タップした本のタイトルを表示するようにしたいです。

発生している問題・エラーメッセージ

cannot find 'contentview' in scope

該当のソースコード

swift
1//App.swift
2
3import SwiftUI
4
5@main
6struct App: App {
7     var body: some Scence {
8          WindowGroup {
9               ContentView()      //<-- Cannot find 'ContentView' in scope
10          }
11     }
12}

swift
1//ContentView.swift
2
3import UIKit
4import AVFoundation
5import Vision
6
7struct CGRectWrapper: Hashable {
8    let rect: CGRect
9    
10    func hash(into hasher: inout Hasher) {
11        hasher.combine(rect.origin.x)
12        hasher.combine(rect.origin.y)
13        hasher.combine(rect.size.width)
14        hasher.combine(rect.size.height)
15    }
16}
17
18class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {
19    let captureSession = AVCaptureSession()
20    let titleLabel = UILabel()
21    
22    var recognizedBooks: [CGRectWrapper: String] = [:]
23    
24    override func viewDidLoad() {
25        super.viewDidLoad()
26        
27        titleLabel.textAlignment = .center
28        titleLabel.textColor = .white
29        titleLabel.backgroundColor = .black
30        titleLabel.alpha = 0.8
31        titleLabel.numberOfLines = 2
32        titleLabel.font = UIFont.boldSystemFont(ofSize: 16)
33        titleLabel.translatesAutoresizingMaskIntoConstraints = false
34        view.addSubview(titleLabel)
35        
36        let padding: CGFloat = 16
37        NSLayoutConstraint.activate([
38            titleLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: padding),
39            titleLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -padding),
40            titleLabel.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -padding),
41        ])
42        
43        guard let videoDevice = AVCaptureDevice.default(for: .video) else {
44            fatalError("ビデオデバイスが利用できません")
45        }
46        
47        do {
48            let videoInput = try AVCaptureDeviceInput(device: videoDevice)
49            
50            if captureSession.canAddInput(videoInput) {
51                captureSession.addInput(videoInput)
52            } else {
53                fatalError("入力をセッションに追加できません")
54            }
55        } catch {
56            fatalError("ビデオ入力の作成に失敗しました: \(error)")
57        }
58        
59        let videoOutput = AVCaptureVideoDataOutput()
60        videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue.global(qos: .userInteractive))
61        
62        if captureSession.canAddOutput(videoOutput) {
63            captureSession.addOutput(videoOutput)
64        } else {
65            fatalError("出力をセッションに追加できません")
66        }
67        
68        captureSession.startRunning()
69    }
70    
71    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
72        guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else {
73            return
74        }
75        
76        let ciImage = CIImage(cvImageBuffer: imageBuffer)
77        let options: [VNImageOption: Any] = [:]
78        let imageRequestHandler = VNImageRequestHandler(ciImage: ciImage, orientation: .up, options: options)
79        
80        let textRecognitionRequest = VNRecognizeTextRequest { request, error in
81            if let error = error {
82                print("文字認識エラー: \(error)")
83                return
84            }
85            
86            guard let results = request.results as? [VNRecognizedTextObservation], !results.isEmpty else {
87                return
88            }
89            
90            self.recognizedBooks = [:] // 認識結果をリセット
91            
92            for result in results {
93                guard let candidate = result.topCandidates(1).first else {
94                    continue
95                }
96                
97                let boundingBox = result.boundingBox
98                let transformedBoundingBox = self.transformBoundingBox(boundingBox)
99                
100                // 画面上に枠線を描画
101                DispatchQueue.main.async {
102                    self.drawBoundingBox(transformedBoundingBox)
103                }
104                
105                // 認識結果を辞書に保存
106                self.recognizedBooks[CGRectWrapper(rect: transformedBoundingBox)] = candidate.string
107            }
108        }
109        textRecognitionRequest.recognitionLevel = .accurate
110        
111        do {
112            try imageRequestHandler.perform([textRecognitionRequest])
113        } catch {
114            print("文字認識リクエストエラー: \(error)")
115        }
116    }
117    
118    func transformBoundingBox(_ boundingBox: CGRect) -> CGRect {
119        // Visionフレームワークの座標系からUIKitの座標系に変換
120        let transformedRect = VNImageRectForNormalizedRect(boundingBox, Int(view.bounds.width), Int(view.bounds.height))
121        
122        // 鏡像反転
123        let flipTransform = CGAffineTransform(scaleX: -1, y: -1).translatedBy(x: -view.bounds.width, y: -view.bounds.height)
124        let flippedRect = transformedRect.applying(flipTransform)
125        
126        return flippedRect
127    }
128    
129    func drawBoundingBox(_ boundingBox: CGRect) {
130        let boundingBoxLayer = CALayer()
131        boundingBoxLayer.frame = boundingBox
132        boundingBoxLayer.borderColor = UIColor.red.cgColor
133        boundingBoxLayer.borderWidth = 2
134        view.layer.addSublayer(boundingBoxLayer)
135    }
136    
137    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
138        guard let touch = touches.first else {
139            return
140        }
141        
142        let touchPoint = touch.location(in: view)
143        
144        // タップした点がどの枠線内にあるかを判定
145        if let selectedBook = recognizedBooks.first(where: { $0.key.rect.contains(touchPoint) }) {
146            let selectedTitle = selectedBook.value
147            titleLabel.text = selectedTitle
148        }
149    }
150}
151