class Button:
    def __init__(self, title, pos, size, bg_color,text_color=(255, 255, 255),font_size=20):
        self.title = title
        self.pos = pos
        self.size = size
        self.bg_color = bg_color
        self.text_color = text_color
        self.font_size = font_size
        self.old_color = bg_color

    def draw(self,window):
        pygame.draw.rect(window,self.bg_color,(self.pos[0],self.pos[1],self.size[0],self.size[1]))
        font = pygame.font.Font('files/字体.ttf', self.font_size)
        text = font.render(self.title, True, self.text_color)
        t_w, t_h = text.get_size()
        window.blit(text, (self.pos[0] + self.size[0] / 2 - t_w / 2, self.pos[1] + self.size[1] / 2 - t_h / 2))

    def is_down(self,pos,window):
        m_x,m_y = pos
        btn_x,btn_y = self.pos
        btn_w,btn_h = self.size
        if btn_x <= m_x <= btn_x +btn_w and btn_y <= m_y <= btn_y + btn_h:
            self.bg_color = (200, 200, 200)
            self.draw(window)

按钮样式：