Custom Scroll bar is not showing in Swift 3

[sarathdev]

    self.myItemsTableView.showsVerticalScrollIndicator = true
    
    
    scrollBar.trackTintColor = UIColor.black
    scrollBar.trackWidth = 3.3
    
    myItemsTableView.to_add(scrollBar)

    myItemsTableView.indicatorStyle = UIScrollViewIndicatorStyle.black
    
   myItemsTableView.separatorInset = myItemsTableView.to_scrollBar!.adjustedTableViewSeparatorInset(forInset: myItemsTableView.separatorInset)]

this is how i added the control. If Im missing any code please help to fix the issue.