写程序应遵循的原则：高内聚（内容的聚合），低耦合（功能与功能之间的联系）
代码里尽量不要有冗余：既重复，没有用的代码
using System.Collections;
using System.Collections.Generic;
using UnityEngine; /// <summary>
/// 单例框架，使用泛型，限制条件：T被实例
/// where T:new() 表示T这个类型要实例
/// </summary>
/// <typeparam name="T"></typeparam>
public class SingleTon<T> where T:new(){ //声明单例，并赋默认值
private static T instance = default(T);
public static T GetInstance()
{
if (instance == null)
{
instance = new T();
return instance;
}
return instance;
}
} public class AudioManager : SingleTon<AudioManager>
{
public AudioManager() { }
public float currentAud;
} public class Demo
{
public Demo()
{
AudioManager.GetInstance().currentAud = 1f;
}
} /// <summary>
/// 简单的单例
/// </summary>
public class SimpleSingleTon
{
//惰性实例化：既调用的时候再实例化
private static SimpleSingleTon instance;
public static SimpleSingleTon GetInstance()
{
if (instance == null)
{
instance = new SimpleSingleTon();
return instance;
}
return instance;
}
private SimpleSingleTon() { }
}