Warcorrespondents/Assets/Scripts/事件/OperationsInfo.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class OperationsInfo : MonoBehaviour
{
    //操作说明类，当玩家进入触发器，显示图片，当离开触发器，关闭图片
    private bool isIn = false;
    private SpriteRenderer spriteRenderer;
    [Tooltip("填入提示消隐和出现的速度")]
    public float speed;
    void Start()
    {
        spriteRenderer = GetComponent<SpriteRenderer>();
    }
    void Update()
    {
        if(isIn && spriteRenderer.color.a < 1)
        {
            spriteRenderer.color = new Color(
                //RBG不变
                spriteRenderer.color.r,spriteRenderer.color.g,spriteRenderer.color.b,
                //a变大
                spriteRenderer.color.a + speed * Time.deltaTime
            );
        }
        if(!isIn && spriteRenderer.color.a > 0)
        {
             spriteRenderer.color = new Color(
                //RBG不变
                spriteRenderer.color.r,spriteRenderer.color.g,spriteRenderer.color.b,
                //a变小
                spriteRenderer.color.a - speed * Time.deltaTime
            );
        }
    }
    void OnTriggerEnter2D(Collider2D other)
    {
        if(other.tag == "Player")
        {
            //当玩家进入
            isIn = true;
        }
    }
    void OnTriggerExit2D(Collider2D other)
    {
        if(other.tag == "Player")
        {
            //当玩家退出
            isIn = false;
        }
    }
}