[Navigation] Only Code (pushViewController()로 화면 전환)

 

코드로만 화면 전환을 하기 위해서는 Scene Delegate 파일에서 네비게이션 컨트롤러를 뷰 컨트롤러 밑에 깔아야 한다.

 

 

Scene Delegate 파일에서 scene(scene:session:connectionOptions:) 함수에 아래의 코드를 추가한다.

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
    
    guard let windowScene = (scene as? UIWindowScene) else { return }

    window = UIWindow(windowScene: windowScene)

    // 초기 뷰 컨트롤러 생성
    let initialViewController = ViewController()

    // 네비게이션 컨트롤러 생성
    let navigationController = UINavigationController(rootViewController: initialViewController)

    // 네비게이션 컨트롤러를 윈도우의 루트 뷰 컨트롤러로 설정
    window?.rootViewController = navigationController
    window?.makeKeyAndVisible()
    
}

 

import UIKit

class SecondViewController: UIViewController {

private lazy var myButton: UIButton = {
    let button = UIButton(type: .custom)
    button.backgroundColor = .systemBlue
    button.layer.cornerRadius = 5
    button.layer.borderWidth = 1
    //        button.layer.borderColor = #colorLiteral(red: 0.2, green: 0.2, blue: 0.2, alpha: 1)
    button.setTitle("ToFirstViewController", for: .normal)
    button.setTitleColor(.white, for: .normal)
    button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
    //    button.isEnabled = false
    button.addTarget(self, action: #selector(myButtonTapped), for: .touchUpInside)
    view.addSubview(button)
    return button
}()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    myButtonSetup()
    view.backgroundColor = .white
}


@objc func myButtonTapped() {
    self.navigationController?.popViewController(animated: true)

}


func myButtonSetup() {
    myButton.translatesAutoresizingMaskIntoConstraints = false

    NSLayoutConstraint.activate([
    myButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 30),
    myButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -30),
    myButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 100),
    myButton.heightAnchor.constraint(equalToConstant: 40)
    ])
}

}

 

화면 전환을 위한 SecondViewController 를 생성하고 되돌아가는 버튼을 하나 만든다.

 

 

import UIKit

class ViewController: UIViewController {

// 화면 전환을 위한 버튼
private lazy var myButton: UIButton = {
    let button = UIButton(type: .custom)
    button.backgroundColor = .systemBlue
    button.layer.cornerRadius = 5
    button.layer.borderWidth = 1
    //        button.layer.borderColor = #colorLiteral(red: 0.2, green: 0.2, blue: 0.2, alpha: 1)
    button.setTitle("ToSecondViewController", for: .normal)
    button.setTitleColor(.white, for: .normal)
    button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
    //    button.isEnabled = false
    button.addTarget(self, action: #selector(myButtonTapped), for: .touchUpInside)
    view.addSubview(button)
    return button
}()



override func viewDidLoad() {
    super.viewDidLoad()
    myButtonSetup()
    view.backgroundColor = .white
}


// 버튼이 클릭됐을 때 (화면 전환)
@objc func myButtonTapped() {
    print("myButtonTapped() 시작")

     let secondVC = SecondViewController()

    //secondViewController.data = "데이터전달"
    // 내비게이션 컨트롤러를 통해 화면 전환
    self.navigationController?.pushViewController(secondVC, animated: true)
    print("myButtonTapped() 완료")

}

// 버튼 오토레이아웃
func myButtonSetup() {
    myButton.translatesAutoresizingMaskIntoConstraints = false

    NSLayoutConstraint.activate([
    myButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 30),
    myButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -30),
    myButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 200),
    myButton.heightAnchor.constraint(equalToConstant: 40)
    ])
}
}

 

그 후 일반적인 코드중심의 네비게이션 화면 전환처럼 똑같이 전환하면 된다.

[Navigation] Storyboard + Code2 (pushViewController()로 화면 전환)

 

 

[버튼스닛펫-코드로만 버튼]

[UIKit CodeSnippets] UIButton Snippet (Only-code)

 

[오토레이아웃]

AutoLayout - Code