add

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

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+using UnityEngine;
+
+/// <summary>
+/// Attaching this script to an object will make it turn as it gets closer to left/right edges of the screen.
+/// Look at how it's used in Example 6.
+/// </summary>
+
+[AddComponentMenu("NGUI/Examples/Window Auto-Yaw")]
+public class WindowAutoYaw : MonoBehaviour
+{
+	public int updateOrder = 0;
+	public Camera uiCamera;
+	public float yawAmount = 20f;
+
+	Transform mTrans;
+
+	void OnDisable ()
+	{
+		mTrans.localRotation = Quaternion.identity;
+	}
+
+	void OnEnable ()
+	{
+		if (uiCamera == null) uiCamera = NGUITools.FindCameraForLayer(gameObject.layer);
+		mTrans = transform;
+	}
+
+	void Update ()
+	{
+		if (uiCamera != null)
+		{
+			Vector3 pos = uiCamera.WorldToViewportPoint(mTrans.position);
+			mTrans.localRotation = Quaternion.Euler(0f, (pos.x * 2f - 1f) * yawAmount, 0f);
+		}
+	}
+}