unity 字体淡入淡出

要实现Unity中字体的淡入淡出，可以使用以下方法：

1. 使用UI Canvas和Text组件创建文本对象。
2. 在文本对象上添加CanvasGroup组件。
3. 在代码中获取CanvasGroup组件，并使用CrossFadeAlpha方法实现淡入淡出效果。

具体的代码实现如下：

using UnityEngine;
using UnityEngine.UI;

public class FadeInOut : MonoBehaviour
{
    public float fadeInTime = 1.0f;  // 淡入时间
    public float fadeOutTime = 1.0f;  // 淡出时间
    public float waitTime = 1.0f;  // 等待时间

    private Text text;  // 文本组件
    private CanvasGroup canvasGroup;  // 画布组件

    void Start()
    {
        text = GetComponent<Text>();
        canvasGroup = GetComponent<CanvasGroup>();
        StartCoroutine(FadeInOutCoroutine());
    }

    IEnumerator FadeInOutCoroutine()
    {
        // 淡入
        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        yield return new WaitForSeconds(waitTime);
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        // 淡出
        canvasGroup.alpha = 1;
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        canvasGroup.alpha = 1;
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        canvasGroup.alpha = 1;
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        yield return new WaitForSeconds(waitTime);
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 1;
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        canvasGroup.alpha = 1;
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        canvasGroup.alpha = 1;
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
    }
}

需要注意的是，上述代码中的淡入淡出效果是通过协程实现的，其中涉及到一定的等待时间。同时，需要根据实际需求调整文本对象的CanvasGroup组件的属性，比如alpha、interactable和blocksRaycasts等。