Simple CanvasRenderer fade script for Unity

SimpleFade.cs

using UnityEngine;

namespace Kano.Unity
{
    public class SimpleFade : MonoBehaviour
    {
        public EaseMode Mode;
        
        [Min(0.1f)]
        public float FadeDuration = 1;

        public float WaitDuration = 1;
        
        private float wait = 0;

        private float fade = 0;

        private CanvasRenderer target;

        private EaseMode currentAction;


        // Start is called before the first frame update
        void Start()
        {
            target = GetComponent<CanvasRenderer>();

            if (Mode == EaseMode.InOut)
                currentAction = EaseMode.In;
            else
                currentAction = Mode;
        }

        // Update is called once per frame
        void Update()
        {
            if (currentAction == EaseMode.None) return;

            fade += Time.deltaTime;

            if (currentAction == EaseMode.In)
            {
                if (fade == 0) target.SetAlpha(0);
                target.SetAlpha(Mathf.Lerp(0f, 1f, fade / FadeDuration));
            } 
            else if (currentAction == EaseMode.Out)
            {
                if (fade == 0) target.SetAlpha(1);
                target.SetAlpha(Mathf.Lerp(1f, 0f, fade / FadeDuration));
            }

            if (Mode == EaseMode.InOut)
            {
                wait += Time.deltaTime;
            }

            if (fade >= FadeDuration)
            {
                if (Mode == EaseMode.InOut && currentAction == EaseMode.In)
                {
                    if (wait >= WaitDuration)
                    {
                        currentAction = EaseMode.Out;
                        fade = 0;
                    }
                }
                else currentAction = EaseMode.None;
            }
        }
    }

    public enum EaseMode
    {
        None,
        In,
        Out,
        InOut
    }
}