用途：一个GUI对象在屏幕中飞行，用GameObject.SendMessage告诉GUI对象何时飞行。

使用：把该脚本拖到一个GameObject上，用另一个脚本GameObject.SendMessage发送飞行消息。

unity3d学习GUIFly脚本代码 ：

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　　//Attach this to the same as the GUIFly is attached to.
             
　　// Fly in
             
　　gameObject.SendMessage(“Fly”, true);
             
　　// Wait 5 seconds
             
　　yield new WaitForSeconds(5);
             
　　// Fly out
             
　　gameObject.SendMessage(“Fly”, false);
             
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　　using UnityEngine;
             
　　using System.Collections;
             
　　public class GUIFly : MonoBehaviour
             
　　{
             
　　public enum InterpolationType
             
　　{
             
　　Linear,
             
　　Sinusoidal,
             
　　Hermite
             
　　}
             
　　public Vector3 m_InPosition;
             
　　public Vector3 m_OutPosition;
             
　　public float m_TravelTime = 0.5f;
             
　　public float m_DelayToStartTravelingAfterMessageReceived = 0.1f;
             
　　public bool m_StartWithInPosition = false;
             
　　public InterpolationType m_InterpolationType = InterpolationType.Sinusoidal;
             
　　void Start ()
             
　　{
             
　　transform.position = (m_StartWithInPosition) ? m_InPosition : m_OutPosition;
             
　　}
             
　　IEnumerator Fly(bool flyIn)
             
　　{
             
　　yield return new WaitForSeconds(m_DelayToStartTravelingAfterMessageReceived);
             
　　Vector3 targetPosition = (flyIn) ? m_InPosition : m_OutPosition;
             
　　float startTime = Time.time;
             
　　Vector3 startPosition = transform.position;
             
　　while (Time.time < startTime + m_TravelTime)
             
　　{
             
　　switch (m_InterpolationType)
             
　　{
             
　　case InterpolationType.Linear:
             
　　transform.position = Vector3.Lerp(startPosition, targetPosition, (Time.time - startTime) / m_TravelTime);
             
　　break;
             
　　case InterpolationType.Sinusoidal:
             
　　transform.position = Sinerp(startPosition, targetPosition, (Time.time - startTime) / m_TravelTime);
             
　　break;
             
　　case InterpolationType.Hermite:
             
　　transform.position = Hermite(startPosition, targetPosition, (Time.time - startTime) / m_TravelTime);
             
　　break;
             
　　}
             
　　yield return 0;
             
　　}
             
　　transform.position = targetPosition;
             
　　}
             
　　void Reset()
             
　　{
             
　　m_InPosition = transform.position;
             
　　}
             
　　private static Vector3 Sinerp(Vector3 start, Vector3 end, float value)
             
　　{
             
　　return new Vector3(Sinerp(start.x, end.x, value), Sinerp(start.y, end.y, value), Sinerp(start.z, end.z, value));
             
　　}
             
　　private static Vector3 Hermite(Vector3 start, Vector3 end, float value)
             
　　{
             
　　return new Vector3(Hermite(start.x, end.x, value), Hermite(start.y, end.y, value), Hermite(start.z, end.z, value));
             
　　}
             
　　/* The following functions are also in the Mathfx script on the UnifyWiki, but are included here so the script is self sufficient. */
             
　　private static float Sinerp(float start, float end, float value)
             
　　{
             
　　return Mathf.Lerp(start, end, Mathf.Sin(value * Mathf.PI * 0.5f));
             
　　}
             
　　private static float Hermite(float start, float end, float value)
             
　　{
             
　　return Mathf.Lerp(start, end, value * value * (3.0f - 2.0f * value));
             
　　}
             
　　}