rabidus-test/Assets/UIFader.cs

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

public class UIFader : MonoBehaviour
{
    public float FadeTime;

    private CanvasGroup canvasGroup;

    private void Awake()
    {
        canvasGroup = GetComponent<CanvasGroup>();
    }

    private bool isShow = true;

    public bool HideOnStart = false;

    
    private void Start()
    {
        if (HideOnStart)
            HidePanel();
    }

    public void ShowPanel()
    {
        LeanTween.value(0, 1, FadeTime).setOnUpdate((float x) =>
        {
            canvasGroup.alpha = x;
        });
        
        canvasGroup.blocksRaycasts = true;
        isShow = true;
    }

    public void HidePanel()
    {
        LeanTween.value(1, 0, FadeTime).setOnUpdate((float x) =>
        {
            canvasGroup.alpha = x;
        });

        canvasGroup.blocksRaycasts = false;
        isShow = false;
    }

    public void Toggle()
    {
        if (isShow)
            HidePanel();
        else
            ShowPanel();
    }
}