設計模式

如同其他軟體，Unity在開發上也會使用到Design Pattern，在此便簡單列出幾項常用的範例。

Scene Manager

Coming Soon...

Ref: Unity：設計靈活的無縫場景轉換機制

Game Manager in Singleton

public enum GameState { NullState, Intro, MainMenu, Game }
public delegate void OnStateChangeHandler();

public class GameManager : MonoBehaviour {

    static GameManager _instance;
    private static object _lock = new object();

    public GameState gameState { get; private set; }
    public event OnStateChangeHandler OnStateChange;

    public static bool isActive { 
        get { 
            return _instance != null; 
        } 
    }

    public static GameManager instance
    {
        get
        {
            if (applicationIsQuitting) {
                return null;
            }
            lock(_lock)
            {
                if (_instance == null)
                {
                    _instance = Object.FindObjectOfType(typeof(GameManager)) as GameManager;

                    if (_instance == null)
                    {
                        GameObject go = new GameObject();
                        _instance = go.AddComponent<GameManager>();
                        go.name = "(singleton) "+typeof(GameManager).ToString();
                        DontDestroyOnLoad(go);
                    }
                }
                return _instance;
            }
        }
    }

    public void SetGameState(GameState gameState) {
        this.gameState = gameState;
        if(OnStateChange != null) {
            OnStateChange();
        }
    }

    private static bool applicationIsQuitting = false;
    public void OnDestroy () {
        applicationIsQuitting = true;
    }
}

參考連結

• toolbox (a better way to use singleton)
  • http://wiki.unity3d.com/index.php/Toolbox
  • http://www.ibm.com/developerworks/webservices/library/co-single/index.html
• singleton intro
  • http://unitypatterns.com/singletons/
  • http://givemepass.blogspot.tw/2011/10/activity.html
• gamemanager
  • http://rusticode.com/2013/12/11/creating-game-manager-using-state-machine-and-singleton-pattern-in-unity3d/
  • http://rusticode.com/2014/01/21/creating-game-manager-using-singleton-pattern-and-monobehaviour-in-unity3d/
• singleton abuse
  • http://stackoverflow.com/questions/137975/what-is-so-bad-about-singletons
  • http://programmers.stackexchange.com/questions/40373/so-singletons-are-bad-then-what