【unity小技巧之三】添加自定义拓展，动态向某个类注入静态函数

有的时候想直接通过transform.position.x=10f;的时候，编译器会报错，必须这样写

transform.position = new Vector3(10f, transform.position.y, transform.position.z);

这样特别的不方便，然而C#3.0新加入一个特性，就是通过this关键字动态的向某个类注入静态函数，比如：

using UnityEngine;
using System.Collections;

public static class ExtraTransform {

	public static void SetX(this Transform transform, float x)  
	{  
		Vector3 newPosition =   
			new Vector3(x, transform.position.y, transform.position.z);
		transform.position = newPosition;
	}

	public static void SetY(this Transform transform, float y)  
	{  
		Vector3 newPosition = 
			new Vector3 (transform.position.x, y, transform.position.z);
		transform.position = newPosition;
	}

	public static void SetZ(this Transform transform, float z)  
	{  
		Vector3 newPosition = 
			new Vector3 (transform.position.x, transform.position.y, z);
		transform.position = newPosition;
	}

	public static float GetX(this Transform transform)  
	{  
		return transform.position.x;  
	}
	
	public static float GetY(this Transform transform)  
	{  
		return transform.position.y;  
	}
	
	public static float GetZ(this Transform transform)  
	{  
		return transform.position.z;  
	} 
}

所以上面的代码直接写transform.SetX(10f);即可，这样代码写起来更加快捷~~~

提示：静态类不能拓展MonoBehaviour类。