유니티 앱 종료시 감지

http://docs.unity3d.com/Documentation/ScriptReference/Application.CancelQuit.html

static function Quit () : void

Description

Quits the player application. Quit is ignored in the editor or the web player.

IMPORTANT: In most cases termination of application under iOS should be left at the user discretion. Consult Apple's Technical Q&A qa1561 page for further details: http://developer.apple.com/iphone/library/qa/qa2008/qa1561.html

C#

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Update() {
        if (Input.GetKey("escape"))
            Application.Quit();
        
    }
}