LandscapePortraitStateToggler

using System.Collections;
using UnityEngine;
using UnityEngine.Events;

public class LandscapePortraitStateToggler : MonoBehaviour {

    public UnityEvent onPortraitMode;
    public UnityEvent onLandscapeMode;

    public static float CheckDelay = 0.5f;        // How long to wait until we check again.

    static DeviceOrientation orientation;        // Current Device Orientation
    static bool isAlive = true;                    // Keep this script running?

    void Start() {
        StartCoroutine(CheckForChange());
    }

    IEnumerator CheckForChange(){
        orientation = Input.deviceOrientation;

        while (isAlive) {

            // Check for an Orientation Change
            switch (Input.deviceOrientation) {
            case DeviceOrientation.Unknown:            // Ignore
            case DeviceOrientation.FaceUp:            // Ignore
            case DeviceOrientation.FaceDown:        // Ignore
                break;
            default:
                if (orientation != Input.deviceOrientation) {
                    orientation = Input.deviceOrientation;
                    if (orientation == DeviceOrientation.Portrait)
                        onPortraitMode.Invoke ();
                    else
                        onLandscapeMode.Invoke ();
                }
                break;
            }

            yield return new WaitForSeconds(CheckDelay);
        }
    }

    void OnDestroy(){
        isAlive = false;
    }
}