CollissionTrigger

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

public class CollissionTrigger : MonoBehaviour {

    private BoxCollider2D playerCollider;

    [SerializeField]
    private BoxCollider2D platformCollider;

    [SerializeField]
    private BoxCollider2D platformTrigger;

    // Use this for initialization
    void Start () {

        playerCollider = GameObject.Find ("Player").GetComponent<BoxCollider2D> ();
        Physics2D.IgnoreCollision (platformCollider, platformTrigger, true);
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.gameObject.name == "Player")
        {
            Physics2D.IgnoreCollision (platformCollider, playerCollider, true);

        }
    }

    void OnTriggerExit2D(Collider2D other)
    {
        if (other.gameObject.name == "Player")
        {
            Physics2D.IgnoreCollision (platformCollider, playerCollider, false);
    }
}
}