在Unity5中使用C#脚本实现UI的下滑、变色、渐隐渐现效果

 一、首先，我们先创建一个Text
    依次选择Component→UI→Text创建一个Text，创建完成后如下：

二、创建完成后，在Project面板点击Create→C# Script，本例命名为InAndFade 
三、编写代码之前，为了确保能够调用到Text类，所以要先手动引入命名空间

using UnityEngine.UI;

 四、完整代码如下

public class InAndFade : MonoBehaviour
{
    //渐隐渐现
    public bool Show = true;
    public bool Fade = false;
    public float duration = 2.5f;
    public float timeFromStart = 0f;    //从场景加载开始经过这些时间后再发生
    //向下滑动
    public bool isSlide = true; //是否从上往下滑动
    public float offset = -1.0f;    //偏差为10
    //变色
    public bool isChangeColor = true;
    //等待
    private bool wait = true;
    void Start()
    {
        if (Show && Fade)
        {
            Fade = false;
        }
        else if (!Show && !Fade)
        {
            Show = true;
        }
    }
    IEnumerator Wait()
    {
        yield return new WaitForSeconds(timeFromStart);
    }
    void Update()
    {
        #region 变色代码
        if (isChangeColor)
        {
            Color nowColor = gameObject.GetComponent<Text>().color;
            if (nowColor.r != 0 && nowColor.g != 255 && nowColor.b != 255)
            {
                nowColor.r--;
                nowColor.g += 2.8f;
                nowColor.b += 0.9f;
            }
            gameObject.GetComponent<Text>().color = nowColor;
            if (nowColor.g >= 40 && nowColor.g <= 255)
            {
                nowColor.g--;
            }
        } 
        #endregion
        #region 滑动代码
        if (isSlide)
        {
            Vector3 initialPos = gameObject.GetComponent<Transform>().position;
            float posProportion = Time.time / duration;
            Vector3 nowPos = new Vector3(initialPos.x, Mathf.Lerp(initialPos.y + offset, initialPos.y, posProportion), initialPos.z);
            gameObject.transform.position = nowPos;
        }
        #endregion
        #region 渐隐渐现代码
        if (wait)
        {
            StartCoroutine(Wait());
        }
        if (Fade)
        {
            if (Time.time > duration)
            {
                Destroy(gameObject);
            }
            Color newColor = gameObject.GetComponent<Text>().color;
            float proportion = Time.time / duration;
            newColor.a = Mathf.Lerp(1, 0, proportion);
            gameObject.GetComponent<Text>().color = newColor;
        }
        if (Show)
        {
            Color newColor = gameObject.GetComponent<Text>().color;
            float proportion = Time.time / duration;
            newColor.a = Mathf.Lerp(0, 1, proportion);
            gameObject.GetComponent<Text>().color = newColor;
        }
        #endregion
    }
}