如何在 Swift 中隐藏第一个 ViewController 的导航栏？

如果您知道所有其他视图都应该使该栏可见，则可以使用 viewWillDisappear 将其再次设置为可见。

在斯威夫特：

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)
}

您可以在 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)
}

您还可以为此创建一个扩展，这样您就可以重用该扩展，而无需在每个视图控制器中一次又一次地实现它。

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)
    }

}

所以你可以使用如下的扩展方法

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

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

在 Swift 3 中，您还可以使用 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;
}

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)
        }

选择

在 viewDidLoad 中使用这个设置

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)
        ])

    /*.  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)

在 IOS 8 中这样做

navigationController?.hidesBarsOnTap = true

但仅当它是 UINavigationController 的一部分时

当你想要它时让它成为假

我使用上述的变体，并将我的应用程序的部分隔离到嵌入不同的 NavController 中。这样，我不必重置可见性。例如，在启动序列中非常有用。

在视图中调用 set hide 方法会出现和消失。如果你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)
}

您可以从窗口控制器（Swift3）中做到这一点

class WindowController: NSWindowController {

    override func windowDidLoad() {
        super.windowDidLoad()

        window?.titleVisibility = .hidden
    }
}