以编程方式在UIViewController中添加UINavigationController

import UIKit

class YourViewController: UIViewController {
    // Your view controller code
}

import UIKit

class YourViewController: UIViewController {
    // Your view controller code

    func addNavigationController() {
        let navigationController = UINavigationController(rootViewController: self)
        // Customize the navigation controller if needed
    }
}

import UIKit

class YourViewController: UIViewController {
    // Your view controller code

    func addNavigationController() {
        let navigationController = UINavigationController(rootViewController: self)
        // Customize the navigation controller if needed

        // Add the navigation controller's view to the current view controller's view
        addChild(navigationController)
        view.addSubview(navigationController.view)
        navigationController.didMove(toParent: self)
    }
}

import UIKit

class YourViewController: UIViewController {
    // Your view controller code

    override func viewDidLoad() {
        super.viewDidLoad()

        addNavigationController()
    }

    func addNavigationController() {
        let navigationController = UINavigationController(rootViewController: self)
        // Customize the navigation controller if needed

        // Add the navigation controller's view to the current view controller's view
        addChild(navigationController)
        view.addSubview(navigationController.view)
        navigationController.didMove(toParent: self)
    }
}