func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    guard let cell = collectionView.cellForItem(at: indexPath) as? CustomCell else {return}
    cell.label.textColor = .black
    indicatorViewLeadingConstraint.constant = (self.view.frame.width / 4) * CGFloat((indexPath.row))
    UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
        self.customTabBar.layoutIfNeeded()
    }, completion: nil)
}

func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
    guard let cell = collectionView.cellForItem(at: indexPath) as? CustomCell else {return}
    cell.label.textColor = .lightGray
}