How to upate a label or slider value in real time

Hi, who is the event to print a variable on a label or just call another function in real time?

I have used LV_EVENT_SCREEN_LOADED. but is not called my function.
Which event should I use to call a function without the use of a button?

void ui_event_Screen1(lv_event_t * e)
{
    lv_event_code_t event_code = lv_event_get_code(e);
    lv_obj_t * target = lv_event_get_target(e);
    if(event_code == LV_EVENT_SCREEN_LOADED) {
        TimeTrack(e);
    }
}

OK, I have created a timer lv_timer_create(ui_event_Timer1, 500, NULL);
I am using SquareLine Studio 1.34, But I do not find the option Timer.

Do you know which version of SquareLine Studio has added Timer widget?

I mean never. Timers is programming entity and code as for any other events is your job. Maybe SQ can add timer init and empty cb …