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78 lines
2.6 KiB
78 lines
2.6 KiB
4 years ago
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using UnityEngine;
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/// <summary>
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/// 继承MonoBehaviour，因为需要Coroutines.
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/// </summary>
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public class Singleton<T> : MonoBehaviour where T : MonoBehaviour
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{
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//静态私有字段
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private static T _instance;
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//静态锁
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private static object _lock = new object();
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//静态公共属性
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public static T Instance
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{
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//获取对象
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get
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{
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//对象是单例的，程序运行期间只会创建一次，销毁后就不存在了。
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if (applicationIsQuitting)
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{
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Debug.LogWarning("[Singleton] Instance '" + typeof(T) +
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"' 已经销毁." +
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" 不需要再次创建.");
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return null;
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}
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//加锁
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lock (_lock)
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{
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if (_instance == null)
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{
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_instance = (T)FindObjectOfType(typeof(T));
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if (FindObjectsOfType(typeof(T)).Length > 1)
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{
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Debug.LogError("[Singleton] 发生异常 " +
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" - 单例类只能有1个" +
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" 修复错误");
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return _instance;
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}
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if (_instance == null)
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{
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GameObject singleton = new GameObject();
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_instance = singleton.AddComponent<T>();
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singleton.name = "(Singleton) " + typeof(T).ToString();
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DontDestroyOnLoad(singleton);
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Debug.LogWarning("[Singleton] " + typeof(T) +
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" 不存在场景中 '" + singleton +
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"' 已经通过 DontDestroyOnLoad 创建");
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}
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else
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{
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Debug.LogWarning("[Singleton] 已经创建: " +
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_instance.gameObject.name);
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}
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}
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//返回单例字段
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return _instance;
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}
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}
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}
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//静态私有字段，判断开关
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private static bool applicationIsQuitting = false;
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/// <summary>
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/// Unity退出的时候,销毁顺序是随机的.
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/// 正常情况, 单例只会在程序退出后销毁.
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/// 如果脚本调用实例时它已经被销毁,
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/// 它将会创建一个对象停留在编辑器场景
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/// 即使你停止播放器也不可以销毁它.
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/// 这样会确保不会创建这种BUG
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/// </summary>
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public void OnDestroy()
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{
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applicationIsQuitting = true;
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}
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}
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