功能

修改鼠标的外观，用动画区分按下与否

代码

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

/// <summary>
/// 修改鼠标的图案（隐藏鼠标，设置UI中一张图片的位置为鼠标的实时位置）
/// </summary>
[RequireComponent(typeof(Animator))]
public class MyCursor : MonoBehaviour
{
    private Animator anim;
    private string animPressParam = "IsPressing";
    // Start is called before the first frame update
    void Start()
    {
        Init();
    }

    // Update is called once per frame
    void Update()
    {
        HideCursor();
        SetPos();
        OnMouseLeftKeyUsed();
    }

    void Init()
    {
        HideCursor();
        anim = GetComponent<Animator>();
    }

    void SetPos()
    {
        transform.position = Input.mousePosition;
    }

    void OnMouseLeftKeyUsed()
    {
        OnCursorDown(0);
        OnCursorUp(0);
    }

    void HideCursor()
    {
        if (Cursor.visible)
            Cursor.visible = false;
    }

    void OnCursorDown(int keyId)
    {
        if(Input.GetMouseButtonDown(keyId))
        {
            // Debug.Log("鼠标按下");
            if (!anim.GetBool(animPressParam))
                anim.SetBool(animPressParam, true);
        }
    }

    void OnCursorUp(int keyId)
    {
        if (Input.GetMouseButtonUp(keyId))
        {
            // Debug.Log("鼠标抬起");
            if (anim.GetBool(animPressParam))
                anim.SetBool(animPressParam, false);

        }
    }
}