Init

README.md

@@ -1,2 +1,2 @@
-# calculator-swift
-
+# mrCalculator
+Calculator for iOS written in Swift

src/ContentView.swift

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+//
+//  ContentView.swift
+//  mrCalculator
+//
+//  Created by mrtuxa on 25.08.22.
+//
+
+import SwiftUI
+
+enum CalcButton: String {
+    case one = "1"
+    case two = "2"
+    case three = "3"
+    case four = "4"
+    case five = "5"
+    case six = "6"
+    case seven = "7"
+    case eight = "8"
+    case nine = "9"
+    case zero = "0"
+    case add = "+"
+    case subtract = "-"
+    case divide = "/"
+    case multiply = "x"
+    case equal = "="
+    case clear = "AC"
+    case decimal = "."
+    case percent = "%"
+    case negative = "-/+"
+    
+    var buttonColor: Color {
+        switch self {
+        case .add, .subtract, .multiply, .divide, .equal:
+            return .orange
+        case .clear, .negative, .percent:
+            return Color(.lightGray)
+        default:
+            return Color(UIColor(red: 55/255.0, green: 55/255.0, blue: 55/255.0, alpha: 1))
+        }
+    }
+}
+
+enum operation {
+    case add, subtract, multiply, divide, none
+}
+
+struct ContentView: View {
+    
+    @State var value = "0"
+    @State var currentOperation: operation = .none
+    @State var runningNumber = 0
+    
+    let buttons: [[CalcButton]] = [
+        [.clear, .negative, .percent, .divide],
+        [.seven, .eight, .nine, .multiply],
+        [.four, .five, .six, .subtract],
+        [.one, .two, .three, .add],
+        [.zero, .decimal, .equal]
+    ]
+    
+    var body: some View {
+        ZStack {
+            Color.black.edgesIgnoringSafeArea(.all)
+            
+            VStack {
+                Spacer()
+                
+                // Text display
+                HStack {
+                Spacer()
+                Text("0")
+                    .bold()
+                    .font(.system(size: 100))
+                    .foregroundColor(.white)
+                }.padding()
+                
+                // Buttons
+                    ForEach(buttons, id: \.self) { row in
+                        HStack(spacing: 12) {
+                        ForEach(row, id: \.self) { item in
+                            Button(action: {
+                                self.onTapListener(button: item)
+                            }, label: {
+                                Text(item.rawValue)
+                                    .font(.system(size: 32))
+                                    .frame(width: self.buttonWidth(item: item),
+                                           height: self.buttonHeight())
+                                    .background(item.buttonColor)
+                                    .foregroundColor(.white)
+                                    .cornerRadius(self.buttonWidth(item: item)/2)
+                            })
+                        }
+                    }.padding(.bottom, 3)
+                }
+            }
+        }
+    }
+    
+    func onTapListener(button: CalcButton) {
+        switch button {
+        case .add, .subtract, .multiply, .divide, .equal:
+            if button == .add {
+                self.currentOperation = .add
+                self.runningNumber += Int(self.value) ?? 0
+            } else if button == .subtract {
+                self.currentOperation = .subtract
+                self.runningNumber += Int(self.value) ?? 0
+            } else if button == .multiply {
+                self.currentOperation = .multiply
+                self.runningNumber += Int(self.value) ?? 0
+            } else if button == .divide {
+                self.currentOperation = .divide
+                self.runningNumber += Int(self.value) ?? 0
+            } else if button == .equal {
+                let runningValue = self.runningNumber
+                let currentValue = Int(self.value) ?? 0
+                switch self.currentOperation {
+                case .add: self.value = "\(runningValue + currentValue)"
+                case .subtract: self.value = "\(runningValue - currentValue)"
+                case .multiply: self.value = "\(runningValue * currentValue)"
+                case .divide: self.value = "\(runningValue / currentValue)"
+                case .none:
+                    break
+                }
+            }
+            
+            if button != .equal {
+                self.value = "0"
+            }
+            
+        case .clear:
+            break
+        case .decimal, .negative, .percent:
+            break
+        default:
+            let number = button.rawValue
+            if self.value == "0" {
+                value = number
+            } else {
+                self.value = "\(self.value)\(number)"
+            }
+        }
+    }
+    
+    func buttonWidth(item: CalcButton) -> CGFloat {
+        if item == .zero {
+            return ((UIScreen.main.bounds.width - (4*12)) / 4) * 2
+        }
+        return (UIScreen.main.bounds.width - (5*12)) / 4
+    }
+    
+    func buttonHeight() -> CGFloat {
+        return (UIScreen.main.bounds.width - (5*12)) / 4
+    }
+}
+
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}

src/mrCalculatorApp.swift

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+//
+//  mrCalculatorApp.swift
+//  mrCalculator
+//
+//  Created by mrtuxa on 25.08.22.
+//
+
+import SwiftUI
+
+@main
+struct mrCalculatorApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}