Unity功能——设置提示面板的显示与掩藏

这里以提示面板的显示与掩藏举例，鼠标靠近物体时提示面板显示，离开物体时提示面板掩藏；

1、添加CanvasGroup组件

对要控制的UI身上添加CanvasGroup这个UGUI组件，后续通过该组件设置对象的显示掩藏；

2、代码设置CanvasGroup里的Alpha值

0为面板掩藏，1为面板显示，使用差值顺滑渐变显示掩藏面板；

using UnityEngine;
using UnityEngine.UI;

public class InfoTips : MonoBehaviour
{
    private float targetAlpha=0;
    private float smoothing = 1f;
    private CanvasGroup canvasGroup;
    private void Start()
    {
        canvasGroup = GetComponent<CanvasGroup>();
        smoothing = 5f;
    }
    private void Update()
    {
        if (canvasGroup.alpha != targetAlpha)
        {
            canvasGroup.alpha = Mathf.Lerp(canvasGroup.alpha, targetAlpha, smoothing * Time.deltaTime);
            if (Mathf.Abs(canvasGroup.alpha - targetAlpha) < 0.01f)
            {
                canvasGroup.alpha = targetAlpha;
            }
        }
    }
    public void ShowTips()
    {
        targetAlpha = 1;
    }
    public void HideTips()
    {
        targetAlpha = 0;
    }
}

3、调用面板显示掩藏函数

这里使用IPointerEnterHandler,IPointerExitHandler接口监听事件，在其实现方法里调用面板显示与掩藏的函数；修改了Alpha值，上面的Tips脚本的Update()里进行自动更新面板的显示与掩藏；

using UnityEngine;
using UnityEngine.EventSystems;

/// <summary>
/// 物品槽
/// </summary>
public class Slot : MonoBehaviour,IPointerEnterHandler,IPointerExitHandler
{
    public InfoTips tips
    
    public void OnPointerEnter(PointerEventData eventData)
    {
        tips.ShowTips();
    }
    public void OnPointerExit(PointerEventData eventData)
    {
        tips.HideTips();
    }
}