How do I change the button font for LV_SYMBOL

How-to
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4

There is an error in this line of code, I guess it should be like this:
lv_obj_add_style(label, LV_LABEL_PART_MAIN, &style_font_tYaHeiB18);
After modification:
lv_obj_add_style(label, LV_LABEL_PART_MAIN, &lv_Font_YaHeiB_18);