How to change the facing direction of one object when it hit the wall?

Helllo, so I'm making a 2D platformer and I can't seem to get the character to rotate / reverse movement as soon as he hits a wall, any ideas or help will be greatly appreciated.

P-S : I'm new to unity and scripting, sorry if its something simple, thank you for taking your time to read this post.

 

I dont know if there is any easier solution (i dont know what you want exactly (flip sprite or somethings like push back)). I just guessing a bit and got some pushback script for you.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Test : MonoBehaviour {
5.  
6.     public float pushback = 50;
7.  
8.     Rigidbody2D rb;
9.     Vector2 vel;
10.  
11.     void Start() {
12.      
13.         rb = GameObject.FindGameObjectWithTag("Player").GetComponent<Rigidbody2D> ();
14.     }
15.  
16.     void OnTriggerEnter2D (Collider2D other) {
17.  
18.         vel = rb.velocity;
19.     }
20.  
21.     void OnCollisionEnter2D (Collision2D col) {
22.      
23.         if (col.gameObject.tag == "Player"){
24.  
25.             rb.AddForce(-vel * pushback);
26.         }
27.     }
28. }

You have to attach a new collider to your wall and make it a trigger. The trigger should be a little bigger then your true collider. If your collider is scaled at 1, I figured out the trigger should be scaled to 1.05 for good results.

 

Thank you so much! to make things more clear, the character sprite must turn in his opposite direction as soon as he hits the wall that he is facing on the x positions, not y. On top of that, I have no idea on where to put this script in the controller player because I have a jumping script inside it, tried before with another script and it broke my character controller script so now I have to restart from scratch >.>

Also , I have clicked on the " is trigger " in the Box Collider 2D but I cannot chose the size of the collider to make it 1.05 instead of 1, how can I do that?

Also, one more question, my character always moves forward, how could I add in the script, a script that when a key is pressed, the character flips, that way the player has more controll over the character