OrientationFixFlutterViewController.swift

import Foundation
import os.log

public class OrientationFixFlutterViewController : FlutterViewController {
    fileprivate var _orientationPreferences: UIInterfaceOrientationMask = .all

    override public var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        get { return _orientationPreferences }
    }

    @objc
    func performOrientationUpdate(_ new_preferences: UIInterfaceOrientationMask) {
        guard new_preferences != _orientationPreferences else {
            return
        }

        _orientationPreferences = new_preferences;

        if #available(iOS 16.0, *) {
            for scene in UIApplication.shared.connectedScenes {
                guard let windowScene = scene as? UIWindowScene else {
                    continue
                }

                let geometryPreferences = UIWindowScene.GeometryPreferences.iOS(interfaceOrientations: _orientationPreferences)
                windowScene.requestGeometryUpdate(geometryPreferences) { error in
                    os_log("Failed to change device orientation: %@", log: OSLog.default, type: .error, error as NSError)
                }
                setNeedsUpdateOfSupportedInterfaceOrientations()
            }
        } else {
            let currentInterfaceOrientation = UInt(1 << UIApplication.shared.statusBarOrientation.rawValue)
            let orientationRaw = UInt(_orientationPreferences.rawValue)

            if ((orientationRaw & currentInterfaceOrientation) == 0) {
                UIViewController.attemptRotationToDeviceOrientation()

                // Force orientation switch if the current orientation is not allowed
                if ((orientationRaw & UIInterfaceOrientationMask.portrait.rawValue) != 0) {
                    // This is no official API but more like a workaround / hack (using
                    // key-value coding on a read-only property). This might break in
                    // the future, but currently it´s the only way to force an orientation change
                    UIDevice.current.setValue(UIInterfaceOrientation.portrait.rawValue, forKey: "orientation")
                } else if ((orientationRaw & UIInterfaceOrientationMask.portraitUpsideDown.rawValue) != 0) {
                    UIDevice.current.setValue(UIInterfaceOrientation.portraitUpsideDown.rawValue, forKey: "orientation")
                } else if ((orientationRaw & UIInterfaceOrientationMask.landscapeLeft.rawValue) != 0) {
                    UIDevice.current.setValue(UIInterfaceOrientation.landscapeLeft.rawValue, forKey: "orientation")
                } else if ((orientationRaw & UIInterfaceOrientationMask.landscapeRight.rawValue) != 0) {
                    UIDevice.current.setValue(UIInterfaceOrientation.landscapeRight.rawValue, forKey: "orientation")
                }
            }
        }
    }
}