你可以在viewWillDisappear中取消隐藏navigationController

override func viewWillDisappear(animated: Bool)
{
    super.viewWillDisappear(animated)
    self.navigationController?.isNavigationBarHidden = false
}

斯威夫特3

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    self.navigationController?.setNavigationBarHidden(false, animated: animated)
}

如果您知道所有其他视图都应该有可见的条，您可以使用viewWillDisappear将它再次设置为可见。

迅速:

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

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationController?.setNavigationBarHidden(false, animated: animated)
}

斯威夫特3

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    // Hide the navigation bar on the this view controller
    self.navigationController?.setNavigationBarHidden(true, animated: animated)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    // Show the navigation bar on other view controllers
    self.navigationController?.setNavigationBarHidden(false, animated: animated)
}

在Swift 3中，你可以使用isNavigationBarHidden属性来显示或隐藏导航栏

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // Hide the navigation bar for current view controller
    self.navigationController?.isNavigationBarHidden = true;
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    // Show the navigation bar on other view controllers
   self.navigationController?.isNavigationBarHidden = false;
}

你可以从窗口控制器(Swift3)来做

class WindowController: NSWindowController {

    override func windowDidLoad() {
        super.windowDidLoad()

        window?.titleVisibility = .hidden
    }
}

你也可以为此创建一个扩展，这样你就可以重用扩展，而不必在每个视图控制器中反复实现这个。

import UIKit

extension UIViewController {
    func hideNavigationBar(animated: Bool){
        // Hide the navigation bar on the this view controller
        self.navigationController?.setNavigationBarHidden(true, animated: animated)

    }

    func showNavigationBar(animated: Bool) {
        // Show the navigation bar on other view controllers
        self.navigationController?.setNavigationBarHidden(false, animated: animated)
    }

}

因此，您可以使用如下所示的扩展方法

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        hideNavigationBar(animated: animated)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        showNavigationBar(animated: animated)
    }

在IOS 8中这样做

navigationController?.hidesBarsOnTap = true

但只有当它是UINavigationController的一部分时

当你想要回它时，把它设为false

我使用了上面的一个变体，并将应用程序的各个部分嵌入到不同的navcontroller中。这样，我就不必重置可见性。例如，在启动序列中非常有用。

在Swift中隐藏导航栏的方法:

self.navigationController?.setNavigationBarHidden(true, animated: true)
self.navigationController?.navigationBar.isHidden = true
self.navigationController?.isNavigationBarHidden = true

在Swift中显示导航栏的方法:

self.navigationController?.setNavigationBarHidden(false, animated: true)
self.navigationController?.navigationBar.isHidden = false
self.navigationController?.isNavigationBarHidden = false

     private func setupView() {
            view.backgroundColor = .white
            navigationController?.setNavigationBarHidden(true, animated: false)
        }

替代

在viewDidLoad中使用此设置

title = "Madman"
navigationController?.isNavigationBarHidden = false
navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.largeTitleDisplayMode = .always

检查Collectionview, scrollview或tableView的约束

 NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
        ])

在视图中调用set hide方法Will appear和Disappear。如果不调用，视图中的方法将消失，状态为false。它将在完整的导航层次结构中隐藏导航栏

 override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.navigationController?.setNavigationBarHidden(true, animated: true)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    self.navigationController?.setNavigationBarHidden(false, animated:true)
}

    /*.  Swift 5  */     
    let controller =  self.storyboard?.instantiateViewController(withIdentifier: "sc_userNavigation") as! UserNavigationViewController
    let navigationController = UINavigationController(rootViewController: controller)
    navigationController.setNavigationBarHidden(true, animated: false)
    navigationController.modalPresentationStyle = .fullScreen
    self.present(navigationController, animated: false, completion: nil)

想在第一个视图控制器上隐藏导航栏

override func viewWillAppear(animated: Bool) {
   self.navigationController?.isNavigationBarHidden = true
}

想在第二个视图控制器上显示导航栏

override func viewWillAppear(animated: Bool) {
   self.navigationController?.isNavigationBarHidden = false
}