var indicatorViewLeadingConstraint:NSLayoutConstraint! // ---- *
func setupCustomTabBar(){
    setupCollectioView()
    self.view.addSubview(customTabBar)
    customTabBar.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
    customTabBar.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
    customTabBar.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true // ---- *
    customTabBar.heightAnchor.constraint(equalToConstant: 60).isActive = true

    customTabBar.addSubview(customTabBarCollectionView)
    customTabBarCollectionView.leadingAnchor.constraint(equalTo: customTabBar.leadingAnchor).isActive = true
    customTabBarCollectionView.trailingAnchor.constraint(equalTo: customTabBar.trailingAnchor).isActive = true
    customTabBarCollectionView.topAnchor.constraint(equalTo: customTabBar.topAnchor).isActive = true
    customTabBarCollectionView.heightAnchor.constraint(equalToConstant: 55).isActive = true

    customTabBar.addSubview(indicatorView)
    indicatorView.widthAnchor.constraint(equalToConstant: self.view.frame.width/4).isActive = true // ---- *
    indicatorView.heightAnchor.constraint(equalToConstant: 5).isActive = true
    indicatorViewLeadingConstraint = indicatorView.leadingAnchor.constraint(equalTo: customTabBar.leadingAnchor)
    indicatorViewLeadingConstraint.isActive = true
    indicatorView.bottomAnchor.constraint(equalTo: customTabBar.bottomAnchor).isActive = true
}