Updating README with inspirations. Updating the way camera is presented. Creating PhotoPreviewView allowing us to see the picture.

README.md

@@ -1,4 +1,15 @@
 # macamera
 
 Personal Camera.  
-AVFoundation Exploration
+AVFoundation Exploration.
+
+I've found 3 ways to do the same thing.
+
+- Original Inspiration : https://github.com/daved01/LiveCameraSwiftUI/tree/main
+- Then : https://www.youtube.com/watch?v=T7R7rNOIjfc
+- Finally : https://www.youtube.com/watch?v=ZmPJBiwgZoQ
+
+The last one is the best for my needs.
+
+The goal right now is to produce.
+Some questions persist.

macamera/CameraPreview/CameraModel.swift

@@ -1,92 +0,0 @@
-//
-//  CameraModel.swift
-//  macamera
-//
-//  Created by Maxime on 06/05/2025.
-//
-
-// Original Repository : https://github.com/daved01/LiveCameraSwiftUI/tree/main
-
-import AVFoundation
-import CoreImage
-
-class CameraModel: NSObject, ObservableObject {
-    
-    @Published var frame: CGImage?
-    
-    @Published var permissionAlert = false
-    @Published var output = AVCapturePhotoOutput()
-    
-    private let captureSession = AVCaptureSession()
-    private let context = CIContext()
-    
-    override init() {
-        super.init()
-        
-        Task.detached(priority: .background) {
-            let accessIsGranted = await self.checkPermission()
-            self.setupCaptureSession(accessIsGranted: accessIsGranted)
-        }
-    }
-}
-
-// MARK: - Convenience Methods
-
-extension CameraModel {
-    
-    private func checkPermission() async -> Bool {
-        switch AVCaptureDevice.authorizationStatus(for: .video) {
-        case .authorized:
-            return true
-        case .notDetermined:
-            let isGranted = await AVCaptureDevice.requestAccess(for: .video)
-            
-            if isGranted == false {
-                permissionAlert.toggle()
-            }
-            
-            return isGranted
-        default:
-            permissionAlert.toggle()
-            return false
-        }
-    }
-    
-    private func setupCaptureSession(accessIsGranted: Bool) {
-        guard accessIsGranted else { return }
-        guard let videoDevice = AVCaptureDevice.default(.builtInDualWideCamera, for: .video, position: .back) else { return }
-        guard let videoDeviceInput = try? AVCaptureDeviceInput(device: videoDevice) else { return }
-        
-        guard captureSession.canAddInput(videoDeviceInput) else { return }
-        captureSession.addInput(videoDeviceInput)
-        
-        let videoOutput = AVCaptureVideoDataOutput()
-        videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "sampleBufferQueue"))
-        captureSession.addOutput(videoOutput)
-        
-        videoOutput.connection(with: .video)?.videoRotationAngle = 90
-        
-        captureSession.startRunning()
-    }
-}
-
-// MARK: - AVCaptureVideoDataOutputSampleBufferDelegate
-
-extension CameraModel: AVCaptureVideoDataOutputSampleBufferDelegate {
-    
-    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
-        guard let cgImage = imageFromSampleBuffer(sampleBuffer: sampleBuffer) else { return }
-        
-        // All UI updates should be/ must be performed on the main queue.
-        DispatchQueue.main.async { [unowned self] in
-            self.frame = cgImage
-        }
-    }
-    
-    private func imageFromSampleBuffer(sampleBuffer: CMSampleBuffer) -> CGImage? {
-        guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return nil }
-        let ciImage = CIImage(cvPixelBuffer: imageBuffer)
-        guard let cgImage = context.createCGImage(ciImage, from: ciImage.extent) else { return nil }
-        return cgImage
-    }
-}

macamera/CameraPreview/CameraView.swift

@@ -1,26 +0,0 @@
-//
-//  CameraView.swift
-//  macamera
-//
-//  Created by Maxime on 06/05/2025.
-//
-
-import SwiftUI
-
-struct CameraView: View {
-    
-    var image: CGImage?
-    private let label = Text("frame")
-    
-    var body: some View {
-        if let image = image {
-            Image(image, scale: 1.0, orientation: .up, label: label)
-        } else {
-            Color.black
-        }
-    }
-}
-
-#Preview {
-    CameraView()
-}

macamera/ContentView.swift

@@ -8,11 +8,18 @@
 import SwiftUI
 
 struct ContentView: View {
-    @StateObject private var model = CameraModel()
+    
+    @State private var capturedImage: UIImage?
     
     var body: some View {
-        CameraView(image: model.frame)
+        
+        if capturedImage == nil {
+            CustomCameraView(capturedImage: $capturedImage)
                 .ignoresSafeArea()
+        } else {
+            PhotoPreviewView(capturedImage: $capturedImage)
+                .ignoresSafeArea()
+        }
     }
 }
 

macamera/CustomCameraView/CameraService.swift

@@ -0,0 +1,74 @@
+//
+//  CameraService.swift
+//  macamera
+//
+//  Created by Maxime on 06/05/2025.
+//
+
+import AVFoundation
+import Foundation
+
+class CameraService {
+    
+    var session: AVCaptureSession?
+    var delegate: AVCapturePhotoCaptureDelegate?
+    
+    let output = AVCapturePhotoOutput()
+    let previewLayer = AVCaptureVideoPreviewLayer()
+}
+
+// MARK: - Public Interface
+
+extension CameraService {
+    
+    func start(delegate: AVCapturePhotoCaptureDelegate) async {
+        self.delegate = delegate
+        
+        let accessIsGranted = await self.checkPermission()
+        self.setupCaptureSession(accessIsGranted: accessIsGranted)
+    }
+    
+    func capturePhoto(with settings: AVCapturePhotoSettings = AVCapturePhotoSettings()) {
+        guard let delegate = delegate else { return }
+        output.capturePhoto(with: settings, delegate: delegate)
+    }
+}
+
+// MARK: - Initialization
+
+extension CameraService {
+    
+    private func checkPermission() async -> Bool {
+        switch AVCaptureDevice.authorizationStatus(for: .video) {
+        case .authorized:
+            return true
+        case .notDetermined:
+            return await AVCaptureDevice.requestAccess(for: .video)
+        default:
+            return false
+        }
+    }
+    
+    private func setupCaptureSession(accessIsGranted: Bool) {
+        guard accessIsGranted,
+              let dualCamera = AVCaptureDevice.default(.builtInDualWideCamera, for: .video, position: .back),
+              let input = try? AVCaptureDeviceInput(device: dualCamera) else {
+                  return
+              }
+        
+        let session = AVCaptureSession()
+        guard session.canAddInput(input), session.canAddOutput(output) else {
+            return
+        }
+        
+        session.addInput(input)
+        session.addOutput(output)
+        output.connection(with: .video)?.videoRotationAngle = 90
+        
+        previewLayer.videoGravity = .resizeAspectFill
+        previewLayer.session = session
+        
+        session.startRunning()
+        self.session = session
+    }
+}

macamera/CustomCameraView/CustomCameraView.swift

@@ -0,0 +1,44 @@
+//
+//  CustomCameraView.swift
+//  macamera
+//
+//  Created by Maxime on 06/05/2025.
+//
+
+import SwiftUI
+
+struct CustomCameraView: View {
+    
+    let cameraService = CameraService()
+    @Binding var capturedImage: UIImage?
+    
+    var body: some View {
+        ZStack {
+            CameraView(cameraService: cameraService, didFinishProcessingPhoto: { result in
+                switch result {
+                case .success(let photo):
+                    if let data = photo.fileDataRepresentation() {
+                        capturedImage = UIImage(data: data)
+                    } else {
+                        print("Error: no image data found.")
+                    }
+                case .failure(let error):
+                    print(error.localizedDescription)
+                }
+            })
+            
+            VStack {
+                Spacer()
+                
+                Button(action: {
+                    cameraService.capturePhoto()
+                }, label: {
+                    Image(systemName: "circle")
+                        .font(.system(size: 80))
+                        .foregroundStyle(.white)
+                })
+                .padding(.bottom, 42)
+            }
+        }
+    }
+}

macamera/CustomCameraView/Views/CameraView.swift

@@ -0,0 +1,54 @@
+//
+//  CameraView.swift
+//  macamera
+//
+//  Created by Maxime on 06/05/2025.
+//
+
+import SwiftUI
+import UIKit
+import AVFoundation
+
+struct CameraView: UIViewControllerRepresentable {
+    typealias UIViewControllerType = UIViewController
+    typealias ProcessingPhotoResult = Result<AVCapturePhoto, Error>
+    
+    let cameraService: CameraService
+    let didFinishProcessingPhoto: (ProcessingPhotoResult) -> Void
+    
+    func makeUIViewController(context: Context) -> UIViewController {
+        Task.detached {
+            await cameraService.start(delegate: context.coordinator)
+        }
+        
+        let viewController = UIViewController()
+        viewController.view.backgroundColor = .black
+        viewController.view.layer.addSublayer(cameraService.previewLayer)
+        cameraService.previewLayer.frame = viewController.view.bounds
+        return viewController
+    }
+    
+    func makeCoordinator() -> Coordinator {
+        Coordinator(self, didFinishProcessingPhoto: didFinishProcessingPhoto)
+    }
+    
+    func updateUIViewController(_ uiViewController: UIViewController, context: Context) { }
+    
+    class Coordinator: NSObject, AVCapturePhotoCaptureDelegate {
+        let parent: CameraView
+        private var didFinishProcessingPhoto: (ProcessingPhotoResult) -> Void
+        
+        init(_ parent: CameraView, didFinishProcessingPhoto: @escaping (ProcessingPhotoResult) -> Void) {
+            self.parent = parent
+            self.didFinishProcessingPhoto = didFinishProcessingPhoto
+        }
+        
+        func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: (any Error)?) {
+            if let error = error {
+                didFinishProcessingPhoto(.failure(error))
+                return
+            }
+            didFinishProcessingPhoto(.success(photo))
+        }
+    }
+}

macamera/PhotoPreviewView.swift

@@ -0,0 +1,34 @@
+//
+//  PhotoPreviewView.swift
+//  macamera
+//
+//  Created by Maxime on 06/05/2025.
+//
+
+import SwiftUI
+
+struct PhotoPreviewView: View {
+    
+    @Binding var capturedImage: UIImage?
+    
+    var body: some View {
+        if let capturedImage = capturedImage {
+            ZStack(alignment: .topLeading) {
+                Image(uiImage: capturedImage)
+                    .resizable()
+                    .scaledToFill()
+                
+                Button(action: {
+                    self.capturedImage = nil
+                }, label: {
+                    Image(systemName: "xmark.circle.fill")
+                        .font(.system(size: 42))
+                        .foregroundStyle(.white)
+                })
+                .padding(.leading, 42)
+                .padding(.top, 62)
+            }
+            .ignoresSafeArea()
+        }
+    }
+}