Why is "GetMouseButtonDown(0)" not working on 2 functions?

Questions & Answers
1

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerScript : MonoBehaviour
{
private bool isInGame = false;

private Rigidbody2D myRB;

Vector2 tempPos;

private bool isRight = false;

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

private void FixedUpdate()
{
    Debug.Log(isRight);
    Debug.Log(myRB);

    if (isRight)
    {
        if (Input.GetKeyDown(KeyCode.RightArrow)) # DOESNT WORK: Input.GetMouseButtonDown(0)
        {
            tempPos = transform.position;

            tempPos.x += 2.0f;

            transform.position = tempPos;

            isRight = false;
        }
    }

    if (!isRight)
    {
        if (Input.GetKeyDown(KeyCode.LeftArrow)) # DOESNT WORK: Input.GetMouseButtonDown(0)
        {
            tempPos = transform.position;

            tempPos.x += -2.0f;

            transform.position = tempPos;

            isRight = true;
        }
    }

    if (!isInGame)
        return;
}

public void InitGame()
{
    isInGame = true;
}

}

2

Try using void Update instead of FixedUpdate

3

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerScript : MonoBehaviour {
private bool isInGame = false;

	private Rigidbody2D myRB;
	Vector2 tempPos;
	private bool isRight = false;
	private void Start()
	{
		myRB = GetComponent<Rigidbody2D>();
	}
	private void Update()
	{
		Debug.Log(isRight);
		Debug.Log(myRB);


		if (Input.GetMouseButtonDown(0)&& isRight)
			{
				tempPos = transform.position;
				tempPos.x += 2.0f;
				transform.position = tempPos;
				print("isRight");
				isRight = false;
			}



		else if (Input.GetMouseButtonDown(0)&& !isRight)
			{
				tempPos = transform.position;
				tempPos.x += -2.0f;
				transform.position = tempPos;
				print("!isRight");
				isRight = true;
			}

		if (!isInGame)
			return;
	}
	public void InitGame()
	{
		isInGame = true;
	}

might this helps?