FadeGraphics.cs

using System.Collections.Generic;
using System.Linq;
using FullInspector;
using MathUtils;
using UnityEngine.UI;

public class FadeGraphics : BaseBehavior
{
    public Dictionary<float, List<Graphic>> GraphicFinalAlphaMap;

    public void Start()
    {
        if ( GraphicFinalAlphaMap.Values.Count == 0 || GraphicFinalAlphaMap.Values.First() == null )
        {
            PopulateNestedGraphics();
        }
        Hide();
        StartCoroutine( CoroutineHelper.WaitAndDo( 0.5f,
            () =>
            {
                foreach ( var v in GraphicFinalAlphaMap.Keys )
                {
                    var v1 = v;
                    StartCoroutine( CoroutineHelper.ChangeFloatBetween( 0.5f, 0f, v1, ( a ) =>
                        {
                            SetTransparency( GraphicFinalAlphaMap[v1], a );
                        },
                        Easer.Equations.QuartEaseIn ) );
                }
            } ) );
    }

    [InspectorButton] public void PopulateNestedGraphics()
    {
        var graphics = GetComponentsInChildren<Graphic>().ToList();
        foreach ( var g in graphics )
        {
            GraphicFinalAlphaMap[1f].Add( g );
        }
    }

    public void SetTransparency( List<Graphic> graphics, float alpha )
    {
        foreach ( var g in graphics )
        {
            g.SetTransparency( alpha );
        }
    }

    [InspectorButton] public void Hide()
    {
        foreach(var v in GraphicFinalAlphaMap.Values ) { 
            SetTransparency( v, 0 );
        }
    }

    [InspectorButton] public void Show()
    {
        foreach ( var k in GraphicFinalAlphaMap.Keys )
        {
            SetTransparency( GraphicFinalAlphaMap[k], k );
        }
    }
}