切换页面线程

def _watchdog_switch(self):
        """
        切换页面线程
        """
        # init
        self.current_controller = self.view_control_map['main']
        self.current_controller.run(self.switch_queue)

        while not self.quit_quit:
            key = self.switch_queue.get()
            if key == 'quit_quit':
                self.quit_quit = True
            else:
                self.current_controller = self.view_control_map[key]
                self.current_controller.run(self.switch_queue)

        # 退出保存信息
        self.quit()
        os._exit(0)