add

Assets/CoolapeFrame/3rd/NGUI_Enhance/Examples/Scripts/Other/LookAtTarget.cs

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+using UnityEngine;
+
+/// <summary>
+/// Attaching this script to an object will make that object face the specified target.
+/// The most ideal use for this script is to attach it to the camera and make the camera look at its target.
+/// </summary>
+
+[AddComponentMenu("NGUI/Examples/Look At Target")]
+public class LookAtTarget : MonoBehaviour
+{
+	public int level = 0;
+	public Transform target;
+	public float speed = 8f;
+
+	Transform mTrans;
+
+	void Start ()
+	{
+		mTrans = transform;
+	}
+
+	void LateUpdate ()
+	{
+		if (target != null)
+		{
+			Vector3 dir = target.position - mTrans.position;
+			float mag = dir.magnitude;
+
+			if (mag > 0.001f)
+			{
+				Quaternion lookRot = Quaternion.LookRotation(dir);
+				mTrans.rotation = Quaternion.Slerp(mTrans.rotation, lookRot, Mathf.Clamp01(speed * Time.deltaTime));
+			}
+		}
+	}
+}