Need help on double jumping in Unity

Question

I have been making a 2D game in Unity, with a group of mine. We have made a character and are able to make him run and jump. Currently, I have been trying to make him double jump so someone can't just spam the jump button and go flying, but nothing has been working.

I've been through about at least 10 different tutorials on it, but nothing has worked. How do I make my character double jump?

public float speed;
public float jump;

float moveVelocity;
private Rigidbody2D myRigidBody;
private bool grounded = true;

void Start () 
{
    myRigidBody = GetComponent<Rigidbody2D> ();
}

void Update () 
{
    //constant run
    myRigidBody.velocity = new Vector2(speed, myRigidBody.velocity.y);

    if (Input.GetKeyDown (KeyCode.Space)) 
    {
        if (grounded) 
        {
            myRigidBody.velocity 
                = new Vector2 (GetComponent<Rigidbody2D> ().velocity.x, jump);
        } 
    }
}

Answer 1

Change 'totalJumps' to 'doubleJumped' and replace that condition with:

if (Input.GetKeyDown (KeyCode.Space)) 
{
    if (grounded || !doubleJumped) {
        myRigidBody.velocity = new Vector2 (GetComponent<Rigidbody2D> ().velocity.x, jump);
        doubleJumped = !grounded;
    }
} else if (grounded) {
    doubleJumped = false;
}

That's saying to jump either when grounded or you haven't double jumped yet, and to reset the double jump variable when on the ground.

---

incidentally, I assumed 'grounded' is being detected, although that's not in your code sample. If needed, do a raycast down to detect when standing on the ground, explained more here: http://answers.unity3d.com/questions/196381/how-do-i-check-if-my-rigidbody-player-is-grounded.html