单独拿TYTabPageBar使用datasouce cellForItemAt方法不走

[Maxcucurbit]

大神你好，求救，单独拿TYTabPageBar使用，为什么datasouce里的pagerTabBar(_ pagerTabBar: TYTabPagerBar, cellForItemAt index: Int) -> UICollectionViewCell & TYTabPagerBarCellProtocol 不走啊，只走了numberOfItemsInPagerTabBar，请问怎么回事
private let barTitles = ["xx", "xx", "xx"]
private let pagerBar = TYTabPagerBar().then {
$0.layout.barStyle = .progressBounceView
$0.layout.cellWidth = Metric.cellWidth
$0.layout.progressColor = Metric.pagerBarFontColorS
$0.layout.progressWidth = Metric.progressWidth
$0.layout.normalTextColor = Metric.pagerBarFontColorN
$0.layout.selectedTextColor = Metric.pagerBarFontColorS
$0.layout.progressHeight = Metric.progressHeight
$0.backgroundColor = .white
$0.layout.cellSpacing = 0
$0.layout.cellEdging = 0
$0.layout.normalTextFont = Metric.pagerBarFontSize
$0.layout.selectedTextFont = Metric.pagerBarFontSize
$0.height = Metric.pagerBarHeight
$0.register(TYTabPagerBarCell.self, forCellWithReuseIdentifier: "TYTabPagerBarCell")
}

override func viewDidLoad() {
super.viewDidLoad()
pagerBar.delegate = self
pagerBar.dataSource = self
navigationItem.titleView = pagerBar
}

func numberOfItemsInPagerTabBar() -> Int {
    return 3
}

func pagerTabBar(_ pagerTabBar: TYTabPagerBar, cellForItemAt index: Int) -> UICollectionViewCell & TYTabPagerBarCellProtocol {
    let cell = TYTabPagerBarCell.init()
    cell.titleLabel?.text = barTitles[index]
    return cell
}

[12207480]

reloadData 没