uipageViewController沒有加載視圖與y = 0

我使用pagevew控制器的抽屜功能。每一件事情都可以正常工作，但第一次當視圖加載時，它會留下狀態欄的空間並在狀態欄下開始。我需要從Y顯示視圖= 0uipageViewController沒有加載視圖與y = 0

private func setupPageViewController() { 
    pageViewController = UIPageViewController(transitionStyle: UIPageViewControllerTransitionStyle.Scroll, navigationOrientation: UIPageViewControllerNavigationOrientation.Horizontal, options: nil) 
    pageViewController.dataSource = self 
    pageViewController.delegate = self 
    pageViewController.setViewControllers([stackPageVC[stackStartLocation]], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil) 
    var pageViewControllerY: CGFloat = 0 
    var pageViewControllerH: CGFloat = 0 
    if navigationBarShouldNotExist { 
     pageViewControllerY = 0 
     pageViewControllerH = Constants.ScreenHeight 
    } else { 
     pageViewControllerY = 0 
     pageViewControllerH = Constants.ScreenHeightWithoutStatusBar 
    } 
    pageViewController.view.frame = CGRect(x: 0, y: pageViewControllerY, width: Constants.ScreenWidth, height: pageViewControllerH) 


    pageViewController.view.backgroundColor = UIColor.clearColor() 
    addChildViewController(pageViewController) 
    view.addSubview(pageViewController.view) 
    pageViewController.didMoveToParentViewController(self) 

}

我試圖使用

for v: UIView in pageViewController.view.subviews { 
     if (v is UIScrollView) { 
      let scroll = v as! UIScrollView 
      scroll.setContentOffset(CGPointMake(0, 0), animated: false) 
      print("----") 
     } 
    }

用於抽屜的功能我使用這個庫drawer

它表示這樣，並希望像這樣的顯示