Unity 3D：如何停止在空中跳跃

Question

I am trying to achieve jumping on a 2d sprite in 3d world. I can jump fine but I'm able to keep jumping in the air which I do not want. I've been trying to find the problem for hours but still cannot come up with a solution.

{ 
   public float jumpHeight = 5f;
    public static bool isJumping = false;

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space) && (isJumping == false))
        {
            gameObject.GetComponent<Rigidbody>().AddForce(new Vector2(0f, jumpHeight), ForceMode.Impulse);
        }
    }

    private void OnCollisionEnter(Collision collision)
    {
        if (collision.collider.tag == "Ground")
        {
            isJumping = false;
        }
    }

    private void OnCollisionExit(Collision collision)
    {
        if (collision.collider.tag == "Ground")
        {
            isJumping = true;
        }
    }
}

Am I missing something?

Answer 1

Put a collider as trigger on your 2D object and check if it is colliding with the terrain or ground. Only then you can jump. The same could be done with a Ray which collides with the ground. You dont need to use both just jump OnCollisionStay and thats it