UIRoot是NGUI控件的根节点，使用是根据屏幕尺寸自动（或手动）调节节点下子控件的大小。
这个组件声明了在编辑模式下运行：[ExecuteInEditMode]，在Inspector编辑修改属性值时，可以直接影响控件。
UIRoot有两个开放属性：
Automatic: bool
ManualHeight: float
在Inspector中，如果Automatic为true，则自动调节；如果是false，则可以手工调节ManualHeight。
调整时可以直接看到控制尺寸的变化。
//----------------------------------------------
// NGUI: Next-Gen UI kit
// Copyright © 2011-2012 Tasharen Entertainment
//---------------------------------------------- using UnityEngine; /// <summary>
/// This is a script used to keep the game object scaled to 2/(Screen.height).
/// If you use it, be sure to NOT use UIOrthoCamera at the same time.
/// </summary> [ExecuteInEditMode]
[AddComponentMenu("NGUI/UI/Root")]
public class UIRoot : MonoBehaviour
{
public bool automatic = true;
public int manualHeight = ; Transform mTrans; void Start ()
{
mTrans = transform; UIOrthoCamera oc = GetComponentInChildren<UIOrthoCamera>(); if (oc != null)
{
Debug.LogWarning("UIRoot should not be active at the same time as UIOrthoCamera. Disabling UIOrthoCamera.", oc);
Camera cam = oc.gameObject.GetComponent<Camera>();
oc.enabled = false;
if (cam != null) cam.orthographicSize = 1f;
}
} void Update ()
{
manualHeight = Mathf.Max(, automatic ? Screen.height : manualHeight); float size = 2f / manualHeight;
Vector3 ls = mTrans.localScale; if (!Mathf.Approximately(ls.x, size) ||
!Mathf.Approximately(ls.y, size) ||
!Mathf.Approximately(ls.z, size))
{
mTrans.localScale = new Vector3(size, size, size);
}
}
}