在页面上隐藏导航栏

Question

我在导航控制器中使用UIPageViewController。导航栏仅在用户触摸视图时显示。现在我想在用户滑动并更改页面时隐藏导航栏。我怎么做？我尝试了下面的代码，但它似乎没有用。

let currentViewController = self.pageViewController!.viewControllers![0]
let viewControllers = [currentViewController]
self.pageViewController!.setViewControllers(
  viewControllers,
  direction: .Forward,
  animated: true, completion: {
      done in self.navigationController?.setNavigationBarHidden(true, animated: false)
})

Answer 1

尝试将其放入用户在滑动时到达的页面的viewWillAppear方法

self.navigationController?.setNavigationBarHidden(true, animated: true)

Answer 2

我添加了此功能，现在可以正常使用

 func pageViewController(pageViewController: UIPageViewController, willTransitionToViewControllers pendingViewControllers: [UIViewController]) {
       self.navigationController?.setNavigationBarHidden(true, animated: true)
}