MonoBehaviour.OnApplicationQuit()

説明

アプリケーションが終了する前にすべてのゲームオブジェクトで呼び出されます

エディターでは、ユーザーが再生モードを停止したときに呼び出されます。

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void OnApplicationQuit()
    {
        Debug.Log("Application ending after " + Time.time + " seconds");
    }
}

Note that iOS applications are usually suspended and do not quit. You should tick "Exit on Suspend" in Player settings for iOS builds to cause the game to quit and not suspend, otherwise you may not see this call. If "Exit on Suspend" is not ticked then you will see calls to OnApplicationPause instead.

Note: On Windows Store Apps and Windows Phone 8.1 there's no application quit event, consider using OnApplicationFocus event when focusStatus equals false.