SwiftUI - Detect orientation changes

Orientation.swift

import Foundation
import SwiftUI

class OrientationObserver: NSObject {
    let action: (UIDeviceOrientation) -> Void

    init(action: @escaping (UIDeviceOrientation) -> Void) {
        self.action = action
        super.init()
        registerForOrientationChanges()
    }

    private func registerForOrientationChanges() {
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(onOrientationChange(_:)),
            name: UIDevice.orientationDidChangeNotification, object: nil)
    }

    private func unregisterForOrientationChanges() {
        NotificationCenter.default.removeObserver(self, name: UIDevice.orientationDidChangeNotification, object: nil)
    }

    @objc func onOrientationChange(_ notification: Notification) {
        guard let device = notification.object as? UIDevice else { return }
        let orientation = device.orientation
        action(orientation)
    }

    deinit {
        unregisterForOrientationChanges()
    }
}

struct OnRotateModifier: ViewModifier {
    let observer: OrientationObserver

    init(action: @escaping (UIDeviceOrientation) -> Void) {
        self.observer = OrientationObserver(action: action)
    }

    func body(content: Content) -> some View {
        content
            .onAppear() {}
            .onDisappear() {}
    }
}


//// Usage (snippet)

    @State var isPortrait = false

    VStack() {
      
          if (isPortrait) {
                Text("Top")
                Spacer()
                CameraView()
                Spacer()
                Text("Bottom")
            } else {
                HStack {
                    Text("Top")
                    Spacer()
                    CameraView()
                    Spacer()
                    Text("Bottom")
                }
            }
      }
        .modifier(OnRotateModifier { orientation in
            isPortrait = orientation.isPortrait
        })