以编程方式快速切换另一个导航

Question

我忽略情节提要并在AppDelegate.swift 中创建UINavigationController

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    window = UIWindow(frame: UIScreen.main.bounds)
    window?.makeKeyAndVisible()

    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .horizontal
    window?.rootViewController = UINavigationController(rootViewController: HomeController(collectionViewLayout: layout))//make the ViewController class to be the root

    return true
}

我有leftBarButton 切换到另一个UINavigationController 或UICollectionViewController（根据您的建议）

override func viewDidLoad() {
    super.viewDidLoad()

    let parentMenuButton = UIButton(frame: CGRect(x: 0, y: 0, width: 34, height: 34))
    parentMenuButton.addTarget(self, action: #selector(self.menuButtonOnClicked), for: .touchUpInside)
    navigationItem.leftBarButtonItem = UIBarButtonItem(customView: parentMenuButton)
}

@objc func menuButtonOnClicked(){
    print("menuButtonOnClicked button is pressed")
}

如何以编程方式实现这一点？（通过按菜单按钮切换另一个导航区域）

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
self.navigationController!.pushViewController(secondViewController, animated: true)

错误：

由于未捕获的异常“NSInvalidArgumentException”而终止应用，原因：“Storyboard () 不包含标识符为“SecondViewController”的视图控制器”

我创建 SecondViewController：

import UIKit

class SecondViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

}

有没有办法在不弄乱情节提要的情况下做到这一点？（仅以编程方式）

Answer 1

你需要在menuButtonOnClicked()中调用push方法

 @objc func menuButtonOnClicked(){
    print("menuButtonOnClicked button is pressed")
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let secondViewController = storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as SecondViewController
    self.navigationController.pushViewController(secondViewController, animated: true)
    }