Unity OnCollision2D not working

Question

I'm new to Unity and C# (though I'm experienced in python) and I am trying to make a pong clone, I've spent ages googling and trying to fix this issue but for some reason my OnCollisionEnter2D won't work

My paddle hit method:

public void PaddleHit(Collision2D col)
{

    float y = WhereBallHitPaddle(transform.position,
        col.transform.position,
        col.collider.bounds.size.y);

    Vector2 dir = new Vector2();

    //determing direction to left or right depending on the paddle

    if (col.gameObject.name == "Player1")
    {
        dir = new Vector2(1, y).normalized;
    }
    if (col.gameObject.name == "Player2")
    {
        dir = new Vector2(-1, y).normalized;
    }

    rb.velocity = dir * speed;

    //play ball paddle collision sound
    SoundManager.Instance.PlayOneShot
        (SoundManager.Instance.ballpaddle);



}

When I run the game the ball moves, then when it comes into contact with a paddle it just stops moving, and if it comes into contact with a wall it bounces off, but at no point does it trigger the OnCollisionEnter2D. (I think my codes indents aren't showing properly here but it is all indented correctly, there are no compile errors or anything).

Answer 1

You don't pass a Collision2D object to your paddle, instead as other people have suggested, do something like this:

void OnCollisionEnter2D(Collision2D collision)
{
    //put code here
    Debug.Log("Hello World");
}