扩展Unity的方法

https://www.cnblogs.com/zhaoqingqing/p/4629336.html

写更少代码的需求

当我们重复写一些繁杂的代码，或C#的一些方法，我们就想能不能有更便捷的方法呢？当然在unity中，我们对它进行扩展。

对unity的类或C#的类进行扩展有以下两点要注意：

1、这个类必须声明为static，扩展的方法也必须要声明为static

2、在使用时，就可以直接调用扩展的方法

扩展Unity的属性

Demo

using UnityEngine;
using System.Collections;

//It is common to create a class to contain all of your
//extension methods. This class must be static.
public static class ExtensionMethods
{
    //Even though they are used like normal methods, extension
    //methods must be declared static. Notice that the first
    //parameter has the 'this' keyword followed by a Transform
    //variable. This variable denotes which class the extension
    //method becomes a part of.
    public static void ResetTransformation(this Transform trans)
    {
        trans.position = Vector3.zero;
        trans.localRotation = Quaternion.identity;
        trans.localScale = new Vector3(1, 1, 1);
    }
}

使用方法

using UnityEngine;
using System.Collections;

public class SomeClass : MonoBehaviour 
{
    void Start () {
        //Notice how you pass no parameter into this
        //extension method even though you had one in the
        //method declaration. The transform object that
        //this method is called from automatically gets
        //passed in as the first parameter.
        transform.ResetTransformation();
    }
}

扩展C#的方法

为C#的集合扩展一个方法，当在调用时，就可以直接调用CFirstOrDefault

public static T CFirstOrDefault<T>(this IEnumerable<T> source)
{
    if (source != null)
    {
        foreach (T item in source)
        {
            return item;
        }
    }

    return default(T);
}

文档资料

文档：http://unity3d.com/learn/tutorials/modules/intermediate/scripting/extension-methods