如何在按钮pygame上显示变量值？

import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((800, 600))

class Button:
    def __init__(self, x, y, width, height, color, text):
        self.rect = pygame.Rect(x, y, width, height)
        self.color = color
        self.text = text

    def draw(self):
        pygame.draw.rect(screen, self.color, self.rect)
        font = pygame.font.Font(None, 36)
        text = font.render(self.text, True, (255, 255, 255))
        text_rect = text.get_rect(center=self.rect.center)
        screen.blit(text, text_rect)

def update_button_text(button, value):
    button.text = "Value: " + str(value)

value = 0
button = Button(300, 200, 200, 100, (0, 255, 0), "Value: 0")

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    screen.fill((0, 0, 0))
    button.draw()
    pygame.display.flip()

value += 1
update_button_text(button, value)