无法隐藏导航栏时刷

Question

我试图隐藏我的导航栏时刷卡并已执行navigationController?.hidesBarsOnSwipe = true在viewWillAppear()和viewDidLoad()但navBar保持未隐藏。就我而言，我在navBar下面实现了一个自定义的segmentedController，它在两个不同的tableViewControllers之间切换。

我不确定这是navBar不隐藏的原因。我的应用看起来像这样，我想隐藏的部分是'票券'部分。

我的代码，例如：

class TicketsViewController: UIViewController { 

    var upcomingTableViewController: UpcomingTableViewController! 
    var pastTransactionTableViewController: PastTransactionsTableViewController! 

    let segmentedControllerView: SegmentedController = { 
     let sc = SegmentedController() 
     sc.translatesAutoresizingMaskIntoConstraints = false 
     sc.segmentedController.addTarget(self, action: #selector(segmentedControlValueChanged), for: .valueChanged) 
     sc.segmentedController.selectedSegmentIndex = 0 
     return sc 
    }() 

    let containerView: UIView = { 
     let v = UIView() 
     v.translatesAutoresizingMaskIntoConstraints = false 
     return v 
    }() 

    override func viewWillAppear(_ animated: Bool) { 
     super.viewWillAppear(animated) 
     navigationController?.hidesBarsOnSwipe = true 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     //These are the two tableViewControllers that are being toggled 
     upcomingTableViewController = UpcomingTableViewController() 
     pastTransactionTableViewController = PastTransactionsTableViewController() 

     setupNavigationBar() 
     setupViews() 
    } 

    @objc func segmentedControlValueChanged(_ sender: UISegmentedControl) { 
     let segmentedControl = sender 

     if segmentedControl.selectedSegmentIndex == 0 { 
      configureChildViewController(childController: upcomingTableViewController, onView: containerView) 
     } else { 
      configureChildViewController(childController: pastTransactionTableViewController, onView: containerView) 
     } 
    } 

    func setupNavigationBar() { 
     Helper.sharedInstance.setupNavigationBar(title: "Tickets", homeVC: self) 
     navigationController?.navigationBar.isTranslucent = false 
     navigationController?.navigationBar.shadowImage = UIImage() 
     navigationController?.hidesBarsOnSwipe = true 
     navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.plain, target: nil, action: nil) 
    } 

    func setupViews() { 

     view.addSubview(segmentedControllerView) 
     view.addSubview(containerView) 

     segmentedControllerView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true 
     segmentedControllerView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true 
     segmentedControllerView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true 
     segmentedControllerView.heightAnchor.constraint(equalToConstant: 44).isActive = true 

     containerView.topAnchor.constraint(equalTo: segmentedControllerView.bottomAnchor, constant: 0).isActive = true 
     containerView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true 
     containerView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true 
     containerView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true 

     configureChildViewController(childController: upcomingTableViewController, onView: containerView) 

    } 

    func configureChildViewController(childController: UIViewController, onView: UIView?) { 
     var holderView = UIView() 

     if let onView = onView { 
      holderView = onView 
     } else { 
      holderView = self.view 
     } 

     addChildViewController(childController) 
     holderView.addSubview(childController.view) 
     constraintViewEqual(to: holderView, childControllerView: childController.view) 
     childController.didMove(toParentViewController: self) 
    } 


    func constraintViewEqual(to containerView: UIView, childControllerView: UIView) { 
     childControllerView.translatesAutoresizingMaskIntoConstraints = false 

     childControllerView.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true 
     childControllerView.leftAnchor.constraint(equalTo: containerView.leftAnchor).isActive = true 
     childControllerView.rightAnchor.constraint(equalTo: containerView.rightAnchor).isActive = true 
     childControllerView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true 
    } 

} 

上面的代码是我这个ticketsViewController完整的代码。感谢一些建议，为什么hideBarsWhenSwipe没有隐藏我的navBar。谢谢。

Answer 1

尝试调整以下元素的大小以匹配视图控制器高度。