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Copy pathMonoSingleton.cs
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92 lines (79 loc) · 2.48 KB
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//非线程安全
using UnityEngine;
/// <summary>
/// 基类继承树中有MonoBehavrour类的单件实现，这种单件实现有利于减少对场景树的查询操作
/// </summary>
/// <typeparam name="T"></typeparam>
public class MonoSingleton<T> : MonoBehaviour where T : Component
{
// 单件子类实例
private static T _instance;
// 在单件中，每个物件的destroyed标志设计上应该分割在不同的存储个空间中，因此，忽略R#的这个提示
// ReSharper disable once StaticFieldInGenericType
private static bool _destroyed;
/// <summary>
/// 获得单件实例，查询场景中是否有该种类型，如果有存储静态变量，如果没有，构建一个带有这个component的gameobject
/// 这种单件实例的GameObject直接挂接在bootroot节点下，在场景中的生命周期和游戏生命周期相同，创建这个单件实例的模块
/// 必须通过DestroyInstance自行管理单件的生命周期
/// </summary>
/// <returns>返回单件实例</returns>
public static T Instance
{
get{
if (_instance == null && !_destroyed)
{
_instance = (T) FindObjectOfType(typeof (T));
if (_instance == null)
{
GameObject go = new GameObject(typeof (T).Name);
_instance = go.AddComponent<T>();
DontDestroyOnLoad(_instance);
var singletonRootGo = GameObject.Find("MonoSingletonRoot");
if (singletonRootGo != null)
{
go.transform.parent = singletonRootGo.transform;
}
}
}
return _instance;
}
}
/// <summary>
/// 删除单件实例,这种继承关系的单件生命周期应该由模块显示管理
/// </summary>
public static void DestroyInstance()
{
if (_instance != null)
Destroy(_instance.gameObject);
_destroyed = true;
_instance = null;
}
/// <summary>
/// Awake消息，确保单件实例的唯一性
/// </summary>
protected virtual void Awake()
{
if (_instance != null && _instance.gameObject != gameObject) Destroy(gameObject);
else if(_instance == null)
_instance = GetComponent<T>();
DontDestroyOnLoad(_instance);
}
/// <summary>
/// OnDestroy消息，确保单件的静态实例会随着GameObject销毁
/// </summary>
protected virtual void OnDestroy()
{
if (_instance != null && _instance.gameObject == gameObject)
{
_instance = null;
}
}
/// <summary>
/// Have Instance
/// </summary>
/// <returns></returns>
public static bool HaveInstance()
{
return _instance != null;
}
}