계산기 UI 및 버튼 클릭 기능 구현

CalculatorApp/SceneDelegate.swift

@@ -16,7 +16,12 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         // 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 }
+        guard let windowScene = (scene as? UIWindowScene) else { return }
+
+        let window = UIWindow(windowScene: windowScene)
+        window.rootViewController = ViewController()
+        self.window = window
+        window.makeKeyAndVisible()
     }
 
     func sceneDidDisconnect(_ scene: UIScene) {

CalculatorApp/ViewController.swift

@@ -9,11 +9,79 @@ import UIKit
 
 class ViewController: UIViewController {
 
+    let resultLabel = UILabel()
+
     override func viewDidLoad() {
         super.viewDidLoad()
+        view.backgroundColor = .white
+        setupResultLabel()
+        setupCalculatorButtons()
         // Do any additional setup after loading the view.
     }
 
+    func setupResultLabel() {
+        resultLabel.text = "0"
+            resultLabel.font = UIFont.systemFont(ofSize: 40)
+            resultLabel.textAlignment = .right
+            resultLabel.translatesAutoresizingMaskIntoConstraints = false
+            view.addSubview(resultLabel)
 
+            NSLayoutConstraint.activate([
+                resultLabel.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20),
+                resultLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
+                resultLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
+                resultLabel.heightAnchor.constraint(equalToConstant: 80)
+            ])
+    }
+
+    func setupCalculatorButtons() {
+        let buttonTitles = [
+            "1", "2", "3", "+",
+            "4", "5", "6", "-",
+            "7", "8", "9", "×",
+            "", "0", "", "÷",
+            "", "", "", "="
+        ]
+
+        let stackView = UIStackView()
+        stackView.axis = .vertical
+        stackView.spacing = 40
+        stackView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(stackView)
+
+        NSLayoutConstraint.activate([
+            stackView.topAnchor.constraint(equalTo: resultLabel.bottomAnchor, constant: 20),
+            stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
+            stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20)
+        ])
+
+        var rowStackViews: [UIStackView] = []
+
+        for (index, title) in buttonTitles.enumerated() {
+            let button = createButton(withTitle: title)
+
+            if index % 4 == 0 {
+                let rowStackView = UIStackView()
+                rowStackView.axis = .horizontal
+                rowStackView.spacing = 10
+                rowStackView.distribution = .fillEqually
+                rowStackViews.append(rowStackView)
+                stackView.addArrangedSubview(rowStackView)
+            }
+
+            rowStackViews[index / 4].addArrangedSubview(button)
+        }
+    }
+        func createButton(withTitle title: String) -> UIButton {
+            let button = UIButton(type: .system)
+                button.setTitle(title, for: .normal)
+                button.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)
+                return button
+        }
+    @objc func buttonTapped(_ sender: UIButton) {
+        if let title = sender.title(for: .normal) {
+            resultLabel.text = title // 결과레이블에 누른 버튼의 텍스트 출력하기
+        }
+    }
 }