在Unity中调用我的background Sprite填充屏幕

using UnityEngine;

public class FillScreen : MonoBehaviour
{
    private void Start()
    {
        ResizeBackground();
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.R))
        {
            ResizeBackground();
        }
    }

    private void ResizeBackground()
    {
        SpriteRenderer spriteRenderer = GetComponent<SpriteRenderer>();
        if (spriteRenderer != null)
        {
            float cameraHeight = Camera.main.orthographicSize * 2f;
            float cameraWidth = cameraHeight * Camera.main.aspect;

            float spriteHeight = spriteRenderer.sprite.bounds.size.y;
            float spriteWidth = spriteRenderer.sprite.bounds.size.x;

            Vector3 scale = transform.localScale;
            scale.x = cameraWidth / spriteWidth;
            scale.y = cameraHeight / spriteHeight;
            transform.localScale = scale;
        }
    }
}