//MARK :- ExpandedTabBarOptions

    /// Background view options
    backgroundColor: UIColor // Default .black
    backgroundAlpha: CGFloat // Default 0.4

    /// List's container options
    containerBackgroundColor: UIColor // Default .white
    containerBackgroundAlpha: CGFloat // Default 1.0
    containerCornerRadius: CGFloat // Default 5.0
    containerBottomMargin: CGFloat // Default 15.0
    containerItemsSpace: CGFloat // Default 8.0
    shadow: ExpandedTabBarShadowOptions? // Default nil

    /// Item View Options
    titleFont: UIFont // Default .systemFont(ofSize: 16)
    titleColor: UIColor // Default .black
    itemHeight: CGFloat // Default 35.0
    imageContentMode: UIViewContentMode // Default .scaleAspectFit
    spaceBetweenImageTitle: CGFloat // Default 8.0


    //MARK :- ExpandedTabBarShadowOptions

    color: UIColor // Default .black
    offset: CGSize // Default .zero
    opacity: Float // Default 0.5
    radius: CGFloat // Default 5.0

@objc public protocol ExpandedTabBarControllerDelegate: class {
    func expandedTabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController, withItem tabBarItem: UITabBarItem?)
}

import UIKit
import ExpandedTabBar

class CustomViewController: ExpandedTabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()
        expandedDelegate = self
        initOptions()
    }

    func initOptions() {
        var options = ExpandedTabBarOptions()
        options.backgroundAlpha = 0.3
        options.shadow = .default
        options.containerItemsSpace = 15
        options.spaceBetweenImageTitle = 15
        self.options = options
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

extension CustomViewController: ExpandedTabBarControllerDelegate {
    func expandedTabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController, withItem tabBarItem: UITabBarItem?) {
        // Do some logic here
    }
}