Unity 2D 角色不要停止跳跃

Question

Okay so I changed the code and added new c# script. i checked the box coliders they are good. Now the problem is that I cant jump.

This is what I changed in Move2DPlayer

private void Jump()
    {
        if (Input.GetButtonDown("Jump") && isGrounded == true)
        {
          gameObject.GetComponent<Rigidbody2D>().AddForce(new Vector2(0f, 5f), ForceMode2D.Impulse);
        }
    }

This is the new c# its called "Grounded"

public class Grounded : MonoBehaviour
{
    GameObject Player;

    private void Start()
    {
        Player = gameObject.transform.parent.gameObject;

    }


    private void Update()
    {

    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.collider.tag == "Ground")
        {
            Player.GetComponent<Move2DPlayer>().isGrounded = true;
        }
    }

    private void OnCollisionExit2D(Collision2D collision)
    {
        if (collision.collider.tag == "Ground")
        {
            Player.GetComponent<Move2DPlayer>().isGrounded = false;
        }
    }
}

Answer 1

private void FixedUpdate()
{
    isGrounded = Physics2D.OverlapCircle(rb.position, checkRadius, whatIsGround);
    //Rest of your stuff
}

private void Update()
{
    if (Input.GetKeyDown(KeyCode.Space) && isGrounded)
    {
        rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
    }
}

Okay, so I managed to get a test project working with this. If this doesn't work for you some the only thing I can think of is that your Rigidbody might too large making the collision detection from OverlapCircle not work correctly. Make sure to set checkRadius large enough to actually detect the ground.

Answer 2

Your player probably has a Collider2D itself and either whatIsGround is not configured correctly or your player has a wrong layer so

Physics2D.OverlapCircle(rb.position, checkRadius, whatIsGround);

returns always true because you collide with the player itself.

I tested your code without any changes and it works for me:

---

However some performance and other considerations:

• Do not Debug.Log in Update or FixedUpdate .. for development it's fine but make sure to remove it later! It's very performance intense.

• You can set the Inspector to debug mode.

  

  This way you can see the values of private fields and you should notice that isGrounded is probably always true in your case

  

• Just a beautify thing but instead of somebool == true and somebool == false rather simply use somebool and !somebool