Unity3d的C#扩展方法Extension methods应用吧

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扩展方法的条件：

必须声明为静态类
必须声明为静态方法
方法的第一个参数为this

首先来扩展Unity中的协程Coroutine，

using UnityEngine;using System.Collections;using System;/// <summary>/// a set of extension methods meant help with common coroutine cases. Example :/// <code>/// void OnTriggerEnter(Collider col) {///     if(col.gameObject.tag != "Ice")///             return; ///     Freeze();///     this.ExecuteLater(()=> Unfreeze(), 2f); // unfreezes the current gameObject 2 seconds from now./// }/// /// </code>/// </summary>public static class TimingExtension{    public delegate bool When();        /// <summary>        /// Execute the given Action when <code>condition</code> returns <code>true</code>.         /// condition will be evaluated every frame.        /// </summary>        /// <param name="action">the action to execute</param>        /// <param name="condition">Condition.</param>    public static void ExecuteWhen(this MonoBehaviour m, Action action, When condition)    {        m.StartCoroutine(ExecuteWhenCoroutine(action, condition));    }        /// <summary>        /// Execute the action after a delay of <code>seconds</code>        /// </summary>        /// <param name="action">Action.</param>        /// <param name="seconds">Seconds.</param>    public static void ExecuteLater(this MonoBehaviour m, Action action, float seconds)    {        m.StartCoroutine(ExecuteLaterCoroutine(action, seconds));    }        /// <summary>        /// Execute an action next frame        /// </summary>        /// <param name="m">M.</param>        /// <param name="action">Action.</param>        public static void ExecuteNextFrame(this MonoBehaviour m, Action action)        {                m.StartCoroutine(ExecuteNextFrameCoroutine(action));        }    private static IEnumerator ExecuteWhenCoroutine(Action action, When condition)    {        while (!condition())            yield return null;        action();    }    private static IEnumerator ExecuteLaterCoroutine(Action action, float seconds)    {        yield return new WaitForSeconds(seconds);        action();    }        private static IEnumerator ExecuteNextFrameCoroutine(Action action)        {                yield return null;                action();        }    public static void Co(this MonoBehaviour m, Func<IEnumerator> coroutine)     {        m.StartCoroutine(CoCoroutine(coroutine));    }    private static IEnumerator CoCoroutine(Func<IEnumerator> coroutine)     {        yield return coroutine;    }}

再来扩展Transform组件的内容，特别是我们相对x,y, z 单独赋值时，有了它是不是方便多了！就是解决类似于这样的问题！

transform.position = new Vector3(5f,transform.position.y, transform.position.z);

看看怎么扩展呢？

using UnityEngine;using System.Collections;public static class ExtensionsTransform{// 扩展了只修改一个值的    public static void SetPositionX(this Transform t, float newX)    {        t.position = new Vector3(newX, t.position.y, t.position.z);    }    public static void SetPositionY(this Transform t, float newY)    {        t.position = new Vector3(t.position.x, newY, t.position.z);    }    public static void SetPositionZ(this Transform t, float newZ)    {        t.position = new Vector3(t.position.x, t.position.y, newZ);    }// 扩展了更快的获取一个值    public static float GetPositionX(this Transform t)    {        return t.position.x;    }    public static float GetPositionY(this Transform t)    {        return t.position.y;    }    public static float GetPositionZ(this Transform t)    {        return t.position.z;    }}

看看使用。

using UnityEngine;using System.Collections;public class Player : MonoBehaviour {    void Update ()     {        //Set new x position to 5        transform.SetPositionX(5f);//效果是一样的    }}

还可以这样扩展Transform！

static public class ExtensionsTransform {/// <summary>/// Gets or add a component. Usage example: /// BoxCollider boxCollider = transform.GetOrAddComponent<BoxCollider>();/// </summary>static public T GetOrAddComponent<T> (this Component child) where T: Component {T result = child.GetComponent<T>();if (result == null) {result = child.gameObject.AddComponent<T>();}return result;}}

接下来看看wiki 上的扩展四元数Quaternion

http://wiki.unity3d.com/index.php/QuaternionExtensions

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