unity开发 --------- prefab

当我们在EditMode下需要用脚本批量添加prefab时，可以用

PrefabUtility.InstantiatePrefab(prefab) as GameObject;

注意：如果用GameObject.Instantiate来创建，创建的不是prefab。也就是说当我们在Assets中修改prefab时，Scene中的prefab并不会做相应的修改。

下面是一个在EditMode下自动生成prefab并自动排序的脚本

using UnityEngine;
using UnityEditor;
using System.Collections;

[ExecuteInEditMode]
public class shuzu : MonoBehaviour {

	public GameObject prefab;

	public int weidu = 10;

	public bool reset = false;

	public bool sort = false;

	// 由于unity中的二维数组无法在Inspector中显示，所以用下面的形式代替二维数组
	[System.Serializable]
	public class test
	{
		public gridId[] testids;
	}
	public test[] ids;


	void Update()
	{
		if (reset) {
			resetnow();
			reset = false;
				}

		if (sort) {
						sortnow ();
						sort = false;
				}

	}

	// 生成prefab，并作为该object的子object。
	// 同时关联到二维数组中（此步骤是为了排序用）
	void resetnow()
	{
		while (transform.childCount > 0)
						DestroyImmediate (transform.GetChild (0).gameObject);
		foreach (test t in ids) {
			t.testids = new gridId[weidu];
			for(int i = 0; i < weidu; i++){
				// 创建prefab
				GameObject o = PrefabUtility.InstantiatePrefab(prefab) as GameObject;
				o.transform.parent = transform;
				o.transform.localScale = Vector3.one;
				t.testids[i] = o.GetComponent<gridId>();
			}
		}
	}

	// 按照二维数组中的顺序，依次排开prefabs
	void sortnow()
	{
		int row = 0;
		int col = 0;

		Bounds bon = NGUIMath.CalculateRelativeWidgetBounds(ids[0].testids[0].transform);
		foreach (test t in ids) {
			col = 0;
			foreach(gridId ele in t.testids) {
				float depth = ele.transform.localPosition.z;
				ele.transform.localPosition = new Vector3(bon.size.x * col, -bon.size.y*row, depth);

				
				col++;
			}
			row++;
		}

		transform.localPosition = new Vector3 (-bon.size.x / 2 * (weidu - 1),
		                                      bon.size.y / 2 * (ids.Length - 1), 0);
	}
}