Why do I have to press the spacebar multiple times for my player to jump?

Questions & Answers
1

This is the code:

void PlayerJumping()
    {
        if (Input.GetButtonDown("Jump") && isGrounded)
        {
            isGrounded = false;
            myBody.AddForce(new Vector2(0f, jumpForce), ForceMode2D.Impulse);
        }
    }

I have to press spacebar multiple times for my player to jump and I’m not sure how to fix it. Pressing other keys for jumping does the same thing.,

2

It is impossible to tell based on just that part of your code. It is most likely either the jump force not being sufficient and/or where you are setting the isGrounded field.

3

If this function is called in FixedUpdate(), then the problem you’re experiencing is in the way that Input.GetButtonDown() is called at a fundamental level.

Input is processed during Update(), which means that, with a high framerate, you will easily miss the opportunities for input to be processed. For example, at ~200 fps, it would be something like:

FixedUpdate()
Update()
// key is pressed
Update() // Input.GetButtonDown() is active this frame
Update() // Input.GetButtonDown() is now false
Update()
FixedUpdate() // Your next check was performed here

In short, the proper solution is to put your Input-handling logic in Update() (or, as it were, a function being called by Update()).