LVGL 8.2 Message box

Event handler

static void event_cb(lv_event_t* e)
{
    
    lv_obj_t* obj = lv_event_get_current_target(e);
    LV_LOG_USER("Button %s clicked", lv_msgbox_get_active_btn_text(obj));
}

establish message box

static void lv_example_msgbox_1(void)
{
    
    static const char* btns[] = {
     "Apply", "Close", "" };
    lv_obj_t* mbox1 = lv_msgbox_create(NULL, "Hello", "This is a message box with two buttons.", btns, true);
        lv_obj_add_event_cb(mbox1, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
    lv_obj_center(mbox1);
}

Running effect

Modify the content and title in the event handler function

static void event_cb(lv_event_t* e)
{
    
    lv_obj_t* obj = lv_event_get_current_target(e);
    uint16_t index = lv_msgbox_get_active_btn(obj);
    LV_LOG_USER("Button %s clicked %d", lv_msgbox_get_active_btn_text(obj),index);
    if (index == 0) {
    
        lv_obj_t* txt = lv_msgbox_get_text(obj);
        lv_label_set_text(txt, "123");
    }
    else {
    
        lv_obj_t* title = lv_msgbox_get_title(obj);
        lv_label_set_text(title, "456");
    }
   
}

Running effect