IOS-Swift, CarbonKit when hit back, the Icons still stayed at pager for a while, how to make them disappear immediately

I have successfully implemented Carbon Kit scrollable TabBar with Images as icons. They problem I have is when I hit back. The icons will remain at the page for a while before disappearing. Is there a way to make them disappear immediately. If I hit the bottom tab bar. This thing will not happen. Please help

Video

Code

import UIKit
import CarbonKit

 class Result: UIViewController, CarbonTabSwipeNavigationDelegate {

    var sURL : String = ""

     override func viewDidLoad() {

        super.viewDidLoad()

        print( " From Home VC : ", sURL)

    //===== substring the URL to get the screen Name=============
        let startIndex = sURL.range(of: "result_")?.upperBound
        let startString = sURL.substring(from: startIndex!) //===startString:                   let endIndex = startString.range(of: ".")!.lowerBound //===endIndex: 

        var sScreen = startString.substring(to: endIndex)
    //=================================================================


        let iconNames = ["0mag", "1dmc", "2toto","3sg", "4lotto", "5cs", "6stc","7m101"]
        var images = [UIImage]()

        for icon in iconNames {
            if let img = UIImage(named: icon)?.withRenderingMode(UIImage.RenderingMode.alwaysOriginal) {
            images.append(img)
            }
        }

        let carbonTabSwipeNavigation = CarbonTabSwipeNavigation(items: images, delegate: self)
        //carbonTabSwipeNavigation.pagesScrollView?.isScrollEnabled = false
        carbonTabSwipeNavigation.insert(intoRootViewController: self)

        carbonTabSwipeNavigation.setTabExtraWidth(20)
        carbonTabSwipeNavigation.setTabBarHeight(100)
        carbonTabSwipeNavigation.toolbar.barTintColor = UIColor.black
        carbonTabSwipeNavigation.toolbar.isTranslucent=true

        var iIndex = UInt()

        if(sScreen=="mag"){
            iIndex = 0
        }else if(sScreen=="dmc"){
            iIndex = 1
        }else if(sScreen=="toto"){
            iIndex = 2
        }else if(sScreen=="sg"){
            iIndex = 3
        }else if(sScreen=="lotto"){
            iIndex = 4
        }else if(sScreen=="stc"){
            iIndex = 5
        }else if(sScreen=="cs"){
            iIndex = 6
        }else if(sScreen=="m101"){
            iIndex = 7
        }

        print("The iIndex: ", iIndex)

        carbonTabSwipeNavigation.setCurrentTabIndex(iIndex, withAnimation: true)

    }

    override func viewDidAppear(_ animated: Bool) {

        super.viewDidAppear(animated)
    }

    func carbonTabSwipeNavigation(_ carbonTabSwipeNavigation: CarbonTabSwipeNavigation, viewControllerAt index: UInt) -> UIViewController {

        var screen = UIViewController()
        print("What is the index: " , index)

        if (index == 0){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "magnum4D" ) as! Magnum4D

        }else if (index == 1){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "dmc" ) as! DMC

        }else if (index == 2){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "toto" ) as! Toto

        }else if (index == 3){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "sg" ) as! SG

        }else if (index == 4){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "lotto" ) as! Lotto
        }else if (index == 5){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "stc" ) as! STC

        }else if (index == 6){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "cs" ) as! CS

        }else if (index == 7){

            screen = self.storyboard?.instantiateViewController( withIdentifier: "m101" ) as! M101
        }

        print(" What screen is called ", screen)
        return screen

    }
 }

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