ios - 如何在 swift 中通过代码添加导航栏并显示另一个 Controller

Question

现在我有两个Controller，一个是FirstViewController，一个是SecondViewController。

在 FirstViewController 中

var secondViewController: SecondViewController!

let textView: UITextView = {
    let textView = UITextView()
    //textView.font = UIFont.systemFont(ofSize: 20)
    textView.isEditable = true
    textView.keyboardDismissMode = .interactive
    textView.allowsEditingTextAttributes = true
    return textView
}()

override func viewDidLoad() {
    super.viewDidLoad()

    secondViewController = SecondViewController()
    secondViewController.firstViewController = self
    setUpLayout()
    addKeyboardObserver()


    // Do any additional setup after loading the view, typically from a nib.
}

然后我添加一个按钮以将 secondaryViewController 的 View 显示为自定义键盘

@objc func showSecondView() {
    textView.resignFirstResponder()
    textView.inputView = secondViewController.view
    textView.becomeFirstResponder()
}

然后在SecondViewController中，如图所示，现在我想在SecondViewController中添加一个导航栏，怎么做？(我可以使用 Storyboard来做到这一点，但我不能使用代码来做到这一点)。 我想在选择 SecondViewController 中的 tableView(红色区域)时显示 ThirdViewController，并且 ThirdViewController 的 View 将显示在红色区域，而不是整个屏幕，(就像 Storyboard 的“显示”连接一样)我该怎么做？

Answer 1

您必须从 Root View Controller 获取导航 Controller ，以便您可以随时隐藏和显示，您可以做的另一件事是，为特定 View Controller 获取导航 View Controller 。但是您无法导航(推送)任何导航 View Controller 。你只能呈现它。检查下面我的代码

import UIKit

class ViewControllerWithoutNavigation: UIViewController { // This is without navigation

    override func viewDidLoad() {
        super.viewDidLoad()


    }


    func gotoNextViewController(){
        let nvc = UINavigationController(rootViewController: ViewControllerWithNavigation())

        let transition = CATransition()
        transition.duration = 0.25
        transition.type = kCATransitionPush
        transition.subtype = kCATransitionFromRight
        self.view.window!.layer.add(transition, forKey: kCATransition)
        //transition is to show like pushing, Without it it will look like presenting from bottom

        self.present(nvc, animated: false, completion: nil)

    }

}


class ViewControllerWithNavigation: UIViewController { // This is with navigation

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = .white
    }


}