hatebin

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

namespace TallyHo
{
    public class CharDropDown : MonoBehaviour
    {
        [Header("Components")]
        private     BoxCollider2D       box2D;
        [Header("Calculations")]
        private     float               oneWayPlatDropInterval = 0.25f;      
        private     IEnumerator         oneWayPlatDropCoroutine;
        private     bool                oneWayPlatDropActive    = false;
        private     CompositeCollider2D tilemapCollider2D;
        private     float               yPosOnDrop              = 0.0f;
        public      float               minDropToRenableCol     = 0.8f;

private void Awake()
        {
            box2D               = GetComponent<BoxCollider2D>();
        }

void Start()
        {
            tilemapCollider2D = GameObject.FindGameObjectWithTag("OneWayPlatform").GetComponent<CompositeCollider2D>();
        }

public void DropDown()
        {
            yPosOnDrop = transform.position.y;
            if (oneWayPlatDropActive) StopCoroutine(oneWayPlatDropCoroutine);
            oneWayPlatDropCoroutine = OneWayPlatDropCoroutine();
            if (!tilemapCollider2D) tilemapCollider2D = GameObject.FindGameObjectWithTag("OneWayPlatform").GetComponent<CompositeCollider2D>();
            StartCoroutine(oneWayPlatDropCoroutine);
        }

private IEnumerator OneWayPlatDropCoroutine()
        {
            oneWayPlatDropActive = true;
            IgnoreOneWayPlatCollision(true, tilemapCollider2D);

float timer = 0;

while (timer < oneWayPlatDropInterval && transform.position.y > yPosOnDrop - minDropToRenableCol)
            {
                timer += Time.deltaTime;
                yield return null;
            }
            IgnoreOneWayPlatCollision(false, tilemapCollider2D);
            oneWayPlatDropActive = false;
        }

void IgnoreOneWayPlatCollision(bool ignore, Collider2D collider2D)
        {
            if (collider2D)
            {
                Physics2D.IgnoreCollision(box2D, collider2D, ignore);
            }
            else
            {
                Debug.LogWarning("Don't have the tilemapCollider2D!");
            }
        }
    }
}