마지막 테코 과제..

CalculatorTest/CalculatorTest/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

CalculatorTest/CalculatorTest/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "tinted"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

CalculatorTest/CalculatorTest/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

CalculatorTest/CalculatorTest/CalculatorApp.swift

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+//
+//  CalculatorApp.swift
+//  CalculatorTest
+//
+//  Created by 김나연 on 12/26/25.
+//
+
+import SwiftUI
+
+@main
+struct CalculatorApp: App {
+    var body: some Scene {
+        WindowGroup {
+            CalculatorView()
+        }
+    }
+}

CalculatorTest/CalculatorTest/CalculatorButtonView.swift

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+//
+//  CalculatorButtonView.swift
+//  CalculatorTest
+//
+//  Created by 김나연 on 12/26/25.
+//
+
+import SwiftUI
+
+struct CalculatorButtonView: View {
+    let button: CalculatorButton
+    let action: () -> Void
+
+    var body: some View {
+        Button(action: action) {
+            Text(button.title)
+                .font(.system(size: 32, weight: .medium))
+                .foregroundColor(buttonForegroundColor)
+                .frame(width: buttonWidth, height: buttonHeight)
+                .background(buttonBackgroundColor)
+                .cornerRadius(buttonWidth / 2)
+        }
+    }
+
+    private var buttonWidth: CGFloat {
+        // 0 버튼은 2배 너비
+        if case .digit(0) = button {
+            return (UIScreen.main.bounds.width - 5 * 12) / 4 * 2 + 12
+        }
+        return (UIScreen.main.bounds.width - 5 * 12) / 4
+    }
+
+    private var buttonHeight: CGFloat {
+        return (UIScreen.main.bounds.width - 5 * 12) / 4
+    }
+
+    private var buttonBackgroundColor: Color {
+        switch button.backgroundColor {
+        case "orange":
+            return Color.orange
+        case "lightGray":
+            return Color(white: 0.8)
+        case "darkGray":
+            return Color(white: 0.3)
+        default:
+            return Color.gray
+        }
+    }
+
+    private var buttonForegroundColor: Color {
+        button.backgroundColor == "lightGray" ? .black : .white
+    }
+}

CalculatorTest/CalculatorTest/CalculatorModel.swift

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+//
+//  CalculatorModel.swift
+//  CalculatorTest
+//
+//  Created by 김나연 on 12/26/25.
+//
+
+import Foundation
+
+enum CalculatorOperation {
+    case add, subtract, multiply, divide, none
+}
+
+// Protocol for dependency injection
+protocol CalculatorModelProtocol {
+    var displayValue: String { get }
+    mutating func inputNumber(_ number: String)
+    mutating func inputOperation(_ operation: CalculatorOperation)
+    mutating func performOperation()
+    mutating func reset()
+    mutating func toggleSign()
+    mutating func percentage()
+}
+
+struct CalculatorModel: CalculatorModelProtocol {
+    private var accumulator: Double = 0
+    private var currentOperation: CalculatorOperation = .none
+    private var isNewNumber: Bool = true
+
+    var displayValue: String = "0"
+
+    // 숫자 입력 처리
+    mutating func inputNumber(_ number: String) {
+        if isNewNumber {
+            displayValue = number
+            isNewNumber = false
+        } else {
+            if number == "." && displayValue.contains(".") {
+                return // 소수점 중복 방지
+            }
+            displayValue += number
+        }
+    }
+
+    // 연산자 입력 처리
+    mutating func inputOperation(_ operation: CalculatorOperation) {
+        if let currentValue = Double(displayValue) {
+            if !isNewNumber {
+                performOperation()
+            }
+            accumulator = currentValue
+            currentOperation = operation
+            isNewNumber = true
+        }
+    }
+
+    // 계산 실행
+    mutating func performOperation() {
+        guard let currentValue = Double(displayValue) else { return }
+
+        switch currentOperation {
+        case .add:
+            accumulator += currentValue
+        case .subtract:
+            accumulator -= currentValue
+        case .multiply:
+            accumulator *= currentValue
+        case .divide:
+            if currentValue != 0 {
+                accumulator /= currentValue
+            } else {
+                displayValue = "Error"
+                reset()
+                return
+            }
+        case .none:
+            accumulator = currentValue
+        }
+
+        displayValue = formatNumber(accumulator)
+        currentOperation = .none
+        isNewNumber = true
+    }
+
+    // 초기화
+    mutating func reset() {
+        accumulator = 0
+        currentOperation = .none
+        isNewNumber = true
+        displayValue = "0"
+    }
+
+    // +/- 부호 변경
+    mutating func toggleSign() {
+        if let value = Double(displayValue) {
+            displayValue = formatNumber(-value)
+        }
+    }
+
+    // 퍼센트 계산
+    mutating func percentage() {
+        if let value = Double(displayValue) {
+            displayValue = formatNumber(value / 100)
+        }
+    }
+
+    // 숫자 포맷팅 (불필요한 소수점 제거)
+    private func formatNumber(_ number: Double) -> String {
+        if number.truncatingRemainder(dividingBy: 1) == 0 {
+            return String(format: "%.0f", number)
+        } else {
+            return String(number)
+        }
+    }
+}

CalculatorTest/CalculatorTest/CalculatorView.swift

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+//
+//  CalculatorView.swift
+//  CalculatorTest
+//
+//  Created by 김나연 on 12/26/25.
+//
+
+import SwiftUI
+
+struct CalculatorView: View {
+    @StateObject private var viewModel = CalculatorViewModel()
+
+    let buttons: [[CalculatorButton]] = [
+        [.clear, .toggleSign, .percentage, .operation(.divide)],
+        [.digit(7), .digit(8), .digit(9), .operation(.multiply)],
+        [.digit(4), .digit(5), .digit(6), .operation(.subtract)],
+        [.digit(1), .digit(2), .digit(3), .operation(.add)],
+        [.digit(0), .decimal, .equals]
+    ]
+
+    var body: some View {
+        ZStack {
+            Color.black.ignoresSafeArea()
+
+            VStack(spacing: 12) {
+                Spacer()
+
+                // 디스플레이
+                displayView
+
+                // 버튼 그리드
+                buttonGrid
+            }
+            .padding()
+        }
+    }
+
+    // MARK: - Display View
+    private var displayView: some View {
+        HStack {
+            Spacer()
+            Text(viewModel.displayText)
+                .font(.system(size: 80, weight: .light))
+                .foregroundColor(.white)
+                .lineLimit(1)
+                .minimumScaleFactor(0.5)
+                .padding(.horizontal)
+        }
+        .frame(maxWidth: .infinity, alignment: .trailing)
+        .padding(.bottom, 20)
+    }
+
+    // MARK: - Button Grid
+    private var buttonGrid: some View {
+        VStack(spacing: 12) {
+            ForEach(buttons.indices, id: \.self) { row in
+                HStack(spacing: 12) {
+                    ForEach(buttons[row], id: \.title) { button in
+                        CalculatorButtonView(button: button) {
+                            viewModel.buttonTapped(button)
+                        }
+                    }
+                }
+            }
+        }
+    }
+}