【SwiftUI】カメラを使いたい

はじめに

SwiftUIでカメラを使いたいと思ってもUIKitをコネコネしないと使えず、
めんどくさいのでコピペで使えるコードを記事にしておきます

準備

Info.plistに以下の設定が必要です。

Key	Value
Privacy - Camera Usage Description	任意の文字列

実装

import SwiftUI

public struct CameraView: UIViewControllerRepresentable {
    @Binding private var image: UIImage?

    @Environment(\.dismiss) private var dismiss

    public init(image: Binding<UIImage?>) {
        self._image = image
    }

    public func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    public func makeUIViewController(context: Context) -> UIImagePickerController {
        let viewController = UIImagePickerController()
        viewController.delegate = context.coordinator
        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            viewController.sourceType = .camera
        }

        return viewController
    }

    public func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) {}
}

extension CameraView {
    public class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        let parent: CameraView

        init(_ parent: CameraView) {
            self.parent = parent
        }

        public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
            if let uiImage = info[.originalImage] as? UIImage {
                self.parent.image = uiImage
            }
            self.parent.dismiss()
        }

        public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            self.parent.dismiss()
        }
    }
}

使い方

import SwiftUI

struct ContentView: View {
    @State private var isPresentedCameraView = false
    
    @State private var image: UIImage?

    var body: some View {
        VStack {
            Button {
                isPresentedCameraView = true
            } label: {
                Text("カメラ表示")
            }
            
            if let image {
                Image(uiImage: image)
                    .resizable()
                    .scaledToFit()
                    .frame(width: 300)
            }
        }
        .fullScreenCover(isPresented: $isPresentedCameraView) {
            CameraView(image: $image).ignoresSafeArea()
        }
    }
}

おわり

これで簡単にカメラが使えます！