将VC加载到XLPagerTabStrip中时，将数据传递给子VC

Question

我已经在我的应用程序中实现了XLPagerTabStrip库，现在在我的Container VC中，我有一个日历，当我单击该日历时，我会调用一个代表我选择的日期值的委托函数。我有3个ChildVC名称，AcceptedBookingVC，PendingBookingVC和HistoryBookingVC。现在我想将selectedDate传递给当前打开的VC。我该如何通过？我已经使用了委托，但是它没有传递我的数据。这是我的代码，

protocol BookingContainerDelegate {

func selectedDate(selectedDate:String)
}

func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition) {

    let selected = calendar.selectedDate

    let dateFormatter1: DateFormatter = DateFormatter()
    dateFormatter1.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
    dateFormatter1.dateFormat = "yyyy-MM-dd"
    print("\(dateFormatter1.string(from: selected!))")
    selectDate = dateFormatter1.string(from: selected!)
    dateDelegate?.selectedDate(selectedDate: dateFormatter1.string(from: selected!))
    self.popViewTopConstraint.constant = -300
    popUpShowing = false

    UIView.animate(withDuration: 0.3) {
        self.view.layoutIfNeeded()
    }
}

当我在Container VC中调用子vc时，这是XLPager的代码，

 override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
    let child1 = UIStoryboard().loadAcceptedBookingVC()
    child1.dateDelegate = self
    child1.selectDate = selectDate
    child1.itemInfo = "Accepted"

    let child2 = UIStoryboard().loadPendingBookingVC()
    child2.selectDate = selectDate
    child2.itemInfo = "Pending"

    let child3 = UIStoryboard().loadHistoryBookingVC()
    child3.selectDate = selectDate
    child3.itemInfo = " History"

    return [child1,child2,child3]
}

这是Child VC，我正在打电话给我的代表，但它没有值，

extension AcceptedBookingVC : BookingContainerDelegate

{     func selectedDate（selectedDate：String）{         打印（selectedDate）         日期= selectedDate     } }

当我选择日期时，我的屏幕看起来像这样，