首先 将该代码挂在NGUI的UIroot上或者场景的物体上

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public void Awake() {
		Screen.SetResolution(1024, 768, true);//自己想要的分辨率，比如1024*768，true表示全屏
		Screen.fullScreen = true;
	}
}