using UnityEngine;
using UnityEngine.UI;//注意添加RawImage命名空间

public class FadeInOutOpen : MonoBehaviour
{
    [HideInInspector]
    public bool isBlack = false;//不透明状态

    private float fadeSpeed = 5f;//透明度变化速率
    public RawImage rawImage;
    public RectTransform rectTransform;


    void Start()
    {
        rawImage.color = Color.black;
        rawImage.gameObject.SetActive(true);
        rectTransform.sizeDelta = new Vector2(Screen.width, Screen.height);//使背景满屏
    }

    void Update()
    {
        rawImage.color = Color.Lerp(rawImage.color, Color.clear, Time.deltaTime * fadeSpeed * 0.5f);//渐亮

        if (rawImage.color.a < 0.05f)
        {
            rawImage.color = Color.clear;
            rawImage.gameObject.SetActive(false);
        }
    }

}