最近由于工作需要学习UNITY3D，对于做PHP的程序猿挑战性灰常大，unity3D国内相关资料少得可怜唉！

根据需求做个防“天天爱消除”主界面左右滑动窗体的效果，百度搜到雨凇大神的一个帖子

不过效果不怎么理想，没有平滑的spring动画。研究NGUI自带的Example 7 - Scroll View (Panel) 例子

实现了如下效果：

UIDragSlider.cs

using UnityEngine;/// 
/// Ever wanted to be able to auto-center on an object within a draggable panel?/// Attach this script to the container that has the objects to center on as its children./// 
//[AddComponentMenu("NGUI/Interaction/Center On Child")]public class UIDragSlider : MonoBehaviour{	/// 
	/// The strength of the spring.	/// 
	public float springStrength = 8f;	/// 
	/// Callback to be triggered when the centering operation completes.	/// 
	public SpringPanel.OnFinished onFinished;		//用来放置灰色、白色小点	public Transform  ponit;	//白色的小点	public GameObject prefabMaskDot;	//灰色的小点	public GameObject prefabBaseDot;	//白色小点的临时对象	private GameObject maskDot;	//灰色、白色小点下方的起始位置。	int start;	UIDraggablePanel mDrag;	GameObject mCenteredObject;	/// 
	/// Game object that the draggable panel is currently centered on.	/// 
	public GameObject centeredObject { get { return mCenteredObject; } }	void OnEnable ()	{		Recenter ();		//initSlider ();	}	void Start ()	{		initSlider ();	}	void OnDragFinished ()	{		if (enabled)			Recenter ();	}	/// 
	/// Recenter the draggable list on the center-most child.	/// 
	public void Recenter ()	{			if (mDrag == null) {			mDrag = NGUITools.FindInParents
    
      (gameObject);						//mDrag = GameObject.Find("UIPanel (Clipped View)").GetComponent
     
      ();			if (mDrag == null) {				Debug.LogWarning (GetType () + " requires " + typeof(UIDraggablePanel) + " on a parent object in order to work", this);				enabled = false;				return;			} else {				//mDrag = mDrag.GetComponent
      
       ();				mDrag.onDragFinished = OnDragFinished;				//Debug.Log(mDrag.panel);				if (mDrag.horizontalScrollBar != null)					mDrag.horizontalScrollBar.onDragFinished = OnDragFinished;				if (mDrag.verticalScrollBar != null)					mDrag.verticalScrollBar.onDragFinished = OnDragFinished;			}		}				if (mDrag.panel == null)			return;				// Calculate the panel's center in world coordinates		Vector4 clip = mDrag.panel.clipRange;		Transform dt = mDrag.panel.cachedTransform;		Vector3 center = dt.localPosition;		center.x += clip.x;		center.y += clip.y;		center = dt.parent.TransformPoint (center);		// Offset this value by the momentum		Vector3 offsetCenter = center - mDrag.currentMomentum * (mDrag.momentumAmount * 0.1f);		mDrag.currentMomentum = Vector3.zero;		float min = float.MaxValue;		Transform closest = null;		Transform trans = transform;		// Determine the closest child		for (int i = 0, imax = trans.childCount; i < imax; ++i) {			Transform t = trans.GetChild (i);			float sqrDist = Vector3.SqrMagnitude (t.position - offsetCenter);			if (sqrDist < min) {				min = sqrDist;				closest = t;			}		}		if (closest != null) {			Debug.Log (closest.gameObject.name);			mCenteredObject = closest.gameObject;						// Figure out the difference between the chosen child and the panel's center in local coordinates			Vector3 cp = dt.InverseTransformPoint (closest.position);			Vector3 cc = dt.InverseTransformPoint (center);			Vector3 offset = cp - cc;			// Offset shouldn't occur if blocked by a zeroed-out scale			if (mDrag.scale.x == 0f)				offset.x = 0f;			if (mDrag.scale.y == 0f)				offset.y = 0f;			if (mDrag.scale.z == 0f)				offset.z = 0f;			// Spring the panel to this calculated position			SpringPanel.Begin (mDrag.gameObject, dt.localPosition - offset, springStrength).onFinished = onFinished;			//两个方法一个设置名字			//获取当前下标			/*			int index=0;			foreach(Transform child in transform){				if(child.gameObject==closest.gameObject){					Debug.Log("index:"+index);					setMaskPos(index);				}				index++;			}			*/			//第二个方法需要命名			string[] indexName = closest.gameObject.name.Split ('_');			setMaskPos (int.Parse (indexName [1]));								} else			mCenteredObject = null;	}	void initSlider ()	{		//因为下方灰色 白色的小点需要根据相册列表的数量来计算居中显示		int size = transform.childCount;		//乘以16表示计算所有小点加起来的宽度		int length = (size - 1) * 17;		//得到下方灰色 白色 小点的居中起始位置		start = (-length) >> 1;		for (int i=0; i< size; i++) {			//把每一个灰色小点加入3D世界			GameObject hui = (GameObject)Instantiate (prefabBaseDot);			//设置灰色小点的父类为另外一个面板			hui.transform.parent = ponit;			//设置每一个灰色小点的位置与缩放，总之让它们居中排列显示在相册列表下方。			hui.transform.localPosition = new Vector3 (start + i * 24, -240f, 0f);			hui.transform.localScale = new Vector3 (17, 17, 1);			//深度 因为是先在屏幕下方绘制4个灰色的小点， 然后在灰色上面绘制白色小点			//表示当前的窗口ID 所以深度是为了设置白色小点在灰色小点之上绘制			hui.GetComponent
       
         ().depth = 0;		}		//把白色小点也加载在3D世界中		maskDot = (GameObject)Instantiate (prefabMaskDot);		//设置它的深度高于 灰色小点，让白色小点显示在灰色小点之上		maskDot.GetComponent
        
          ().depth = 1;		//设置白色小点的开始位置		setMaskPos (0);			}	void setMaskPos (int index)	{		maskDot.transform.parent = ponit;		maskDot.transform.localPosition = new Vector3 (start + index * 24, -240f, -10f);		maskDot.transform.localScale = new Vector3 (17, 17, 1);			}}
        
       
      
     
    

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