Set font by resource ID got BottomNavigationView

bnv-set-font.kt

fun BottomNavigationView.setFont(@FontRes rId: Int) {
    val menuView = this.getChildAt(0) as BottomNavigationMenuView
    val menuCount = menuView.childCount

    (0 until menuCount).forEach {
        val itemView = menuView.getChildAt(it) as BottomNavigationItemView
        val titleView = itemView.getChildAt(1) as BaselineLayout
        val smallLabel = titleView.getChildAt(0) as TextView
        val largeLabel = titleView.getChildAt(1) as TextView

        smallLabel.typeface = ResourcesCompat.getFont(context, rId)
        largeLabel.typeface = ResourcesCompat.getFont(context, rId)
    }
}