Swift - Xcode를 활용하여 간단한 앱 만들기

(인덕대학교 컴퓨터소프트웨어학과 iOS 프로그래밍 기초(21-2학기) 한성현 교수님 강의 내용을 변형 및 요약했습니다.)

Xcode

• Xcode는 mac에서 swift를 사용하여 앱을 만드는 도구입니다. 
• Xcode를 잘 사용할 줄 안다면 Android Studio에서 안드로이드 앱을 만드는 데에도 도움이 됩니다.
• UI를 drag & drop 하여 UI를 디자인하고 그 후 본인이 원하는 방향대로 코딩하는 방식입니다.
• 프로젝트를 만들면 기본적으로 앱을 구동할 수 있는 틀을 만들어 줍니다.

(이번에는 간단히 Button, Label, TextField만 사용하여 앱을 만들어봤습니다.)

AppDelegate.swift (프로젝트 생성 시 기본으로 만들어지는 파일이지만 이번 프로젝트에는 수정하지는 않았습니다.)

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }
}

 

SceneDelegate.swift (프로젝트 생성시 기본으로 만들어지는 파일이지만 이번 프로젝트에는 수정하지는 않았습니다.)

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    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 _ = (scene as? UIWindowScene) else { return }
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not necessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.
    }
}

 

ViewController.swift

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var ldblabel: UILabel!
    @IBOutlet weak var ldbinput: UITextField!
    
    @IBAction func ldbinsert(_ sender: UIButton) {
        ldblabel.text = "Hi," + ldbinput.text!
    }
    @IBAction func ldbdelete(_ sender: UIButton) {
        ldblabel.text = "Welcome ! Xcode"
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
}

 

(실행결과)

(Welcome ! Xcode가 처음으로 나오고 TextField에 문자를 입력하고 "입력" 버튼을 누르면 Label에 Hi, [입력한 문자] 이렇게 나오고 삭제 버튼을 누르면 Label에 처음 Label과 동일한 "Welcome ! Xcode"가 Label에 입력됩니다.)