对常见的顶部Tab页点击、滑动分页做了封装。它使用基于ViewController的container特性（而不是scrollview）来管理各个子页面，以支持无限分页

import UIKit

class TESTVC: BaseViewController {

    private let tabTitleArray = ["111", "222", "333"]
    private var slideView = DLCustomSlideView()
    
    lazy var vcs: [UIViewController] = {
        var arr = [UIViewController]()
        for index in 0 ..< tabTitleArray.count {
            switch index {
            case 0:
            let listVC = UIViewController()
            arr.append(listVC)
                break
            case 1:
                let listVC = UIViewController()
                arr.append(listVC)
                break
            default:
                let listVC = UIViewController()
                arr.append(listVC)
                break
            }
        }
        return arr
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        
    }
    
    
    private func setupUI() {
        title = "TEST"
        contentView.backgroundColor = COLOR_BACKGROUND
        let tabbar = DLScrollTabbarView(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 40))
        contentView.addSubview(slideView)
        slideView.snp.makeConstraints {
            $0.left.equalToSuperview()
            $0.right.equalToSuperview()
            $0.top.bottom.equalToSuperview()
        }
        
        let cache = DLLRUCache(count: tabTitleArray.count)
        tabbar.backgroundColor = COLOR_WHITE
        tabbar.tabItemNormalColor = COLOR_MAJOR_FONT
        tabbar.tabItemSelectedColor = COLOR_ORANGE
        tabbar.trackColor = COLOR_ORANGE
        tabbar.tabItemNormalFontSize = 14.0
        
        var tabItemArray = [DLScrollTabbarItem]()
        for title in tabTitleArray {
            let item = DLScrollTabbarItem(title: title, width: SCREEN_WIDTH/CGFloat(tabTitleArray.count))
            tabItemArray.append(item!)
        }
        tabbar.tabbarItems = tabItemArray
        slideView.tabbar = tabbar
        slideView.cache = cache
        slideView.tabbarBottomSpacing = 0
        slideView.baseViewController = self
        slideView.delegate = self
        slideView.setup()
        slideView.selectedIndex = 0
    }
    
}

extension TESTVC: DLCustomSlideViewDelegate {
    func numberOfTabs(in sender: DLCustomSlideView?) -> Int {
        return tabTitleArray.count
    }
    
    func dlCustomSlideView(_ sender: DLCustomSlideView?, controllerAt index: Int) -> UIViewController! {
        return vcs[index]
    }
    
}