sample_platform_patrol

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

public class AiPatrol : MonoBehaviour
{
    [SerializeField] float _speed;
    [SerializeField] float _distance;
    [SerializeField] Transform groundDetection;
    private bool _movingRight = true;

    private void Update()
    {
        transform.Translate(Vector2.right * _speed * Time.deltaTime);

        RaycastHit2D groundInfo = Physics2D.Raycast(groundDetection.position, Vector2.down, _distance);
        if (groundInfo.collider == false)
        {
            if (_movingRight == true)
            {
                transform.eulerAngles = new Vector3(0, -180, 0);
                _movingRight = false;
            }
            else
            {
                transform.eulerAngles = new Vector3(0, 0, 0);
                _movingRight = true;
            }
        }
    }
}