Unity单例

1、非Mono单例：

 1 using System;
 2 using System.Reflection;
 3 using System.Collections.Generic;
 4
 5 public static class Singleton<T> where T : class
 6 {
 7     static volatile T _instance;
 8     static object _lock = new object();
 9
10     static Singleton()
11     {
12     }
13
14     public static T Get()
15     {
16         if (_instance == null)
17         {
18             lock (_lock)
19             {
20                 if (_instance == null)
21                 {
22                     ConstructorInfo constructor = null;
23                     try
24                     {
25                         constructor = typeof(T).GetConstructor(BindingFlags.Instance |
26                                                                BindingFlags.NonPublic, null, new Type[0], null);
27                     }
28                     catch (Exception e)
29                     {
30                         throw e;
31                     }
32
33                     if (constructor == null || constructor.IsAssembly)
34                     {
35                         throw new Exception(string.Format("A private or protected constructor is missing for ‘{0}‘.", typeof(T).Name));
36                     }
37
38                     _instance = (T)constructor.Invoke(null);
39                 }
40             }
41         }
42         return _instance;
43     }
44 }

　　调用方法：Singleton<XXX>.Get()，XXX表示非继承MonoBehavior的类的类名。

2、Mono单例：

 1 using System;
 2 using System.Collections.Generic;
 3 using UnityEngine;
 4
 5 public static class MonoSingleton<T> where T : MonoBehaviour
 6 {
 7     private static T _instance;
 8
 9     public static T Get()
10     {
11         if (_instance == null)
12         {
13             _instance = UnityEngine.Object.FindObjectOfType<T>();
14         }
15
16         return _instance;
17     }
18 }

　　调用方法：MonoSingleton<XXX>.Get()，XXX表示继承MonoBehavior的类的类名。