Restarting the scene with a key in Unity

Question

I'm developing an university exercise in Unity2D where I need to restart my game by pressing the key R. The game is a ball that moves when you press space. I added some code but when I press R it won't happen anything.

My code:

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

public class RestartGame : MonoBehaviour
{
    public void restart()
    {
        if (Input.GetKeyDown(KeyCode.R))
        {
            SceneManager.LoadSceneAsync(
                SceneManager.GetActiveScene().buildIndex);
        }
    }
}

I saw in a forum that I had to create an empty object and add the script there to make it work. But for some reason it won't happen anything.

Help is much appreciated.

Answer 1

If you want to check for User Input you need to do that in the Update() Method that is provided by Unity.

Example:

private void Update() {
    if (Input.GetKeyDown(KeyCode.R)) {
        SceneManager.LoadSceneAsync(
            SceneManager.GetActiveScene().buildIndex);
    }
}

If you don't use the Update Method or a Method that is called each frame (eg. OnTriggerStay()) you won't be able to detect if a User actually pressed a Key.