implement settings

MultiChrono/AppSettings.swift

@@ -0,0 +1,33 @@
+//
+//  AppSettings.swift
+//  MultiChrono
+//
+//  Created by Beatrice Dellacà on 27/01/26.
+//
+
+import Foundation
+import Combine
+
+enum TimeFormat: String, CaseIterable, Codable {
+    case millis   = "Millis (00:00.000)"
+    case cents    = "Cents (00:00.00)"
+    case tenths   = "Tenths (00:00.0)"
+    case seconds  = "Seconds (00:00)"
+    
+    var displayName: String { self.rawValue }
+}
+
+class AppSettings: ObservableObject {
+    static let shared = AppSettings()
+    
+    @Published var timeFormat: TimeFormat {
+        didSet {
+            UserDefaults.standard.set(timeFormat.rawValue, forKey: "timeFormat")
+        }
+    }
+    
+    private init() {
+        let savedFormat = UserDefaults.standard.string(forKey: "timeFormat") ?? TimeFormat.tenths.rawValue
+        self.timeFormat = TimeFormat(rawValue: savedFormat) ?? .tenths
+    }
+}

MultiChrono/ContentView.swift

@@ -53,6 +53,7 @@ class ContentViewModel: ObservableObject {
 struct ContentView: View {
     @StateObject private var viewModel = ContentViewModel()
     @State private var isShowingAddSheet = false
+    @State private var isShowingSettings = false
     @State private var selectedStopwatch: Stopwatch?
     @Environment(\.scenePhase) private var scenePhase
     
@@ -78,6 +79,13 @@ struct ContentView: View {
             .listStyle(.plain)
             .navigationTitle("MultiChrono")
             .toolbar {
+                ToolbarItem(placement: .topBarLeading) {
+                    Button {
+                        isShowingSettings = true
+                    } label: {
+                        Image(systemName: "gearshape")
+                    }
+                }
                 ToolbarItem(placement: .primaryAction) {
                     Button(action: {
                         isShowingAddSheet = true
@@ -92,6 +100,9 @@ struct ContentView: View {
                     isShowingAddSheet = false
                 }
             }
+            .sheet(isPresented: $isShowingSettings) {
+                SettingsView()
+            }
             .sheet(item: $selectedStopwatch) { stopwatch in
                 StopwatchDetailView(
                     stopwatch: stopwatch,
@@ -115,6 +126,7 @@ struct ContentView: View {
                 }
             }
         }
+
         .onChange(of: scenePhase) { newPhase in
             if newPhase == .background || newPhase == .inactive {
                 viewModel.save()

MultiChrono/SettingsView.swift

@@ -0,0 +1,41 @@
+//
+//  SettingsView.swift
+//  MultiChrono
+//
+//  Created by Beatrice Dellacà on 27/01/26.
+//
+
+import SwiftUI
+
+struct SettingsView: View {
+    @ObservedObject var settings = AppSettings.shared
+    @Environment(\.dismiss) private var dismiss
+    
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section(header: Text("Time Display Format")) {
+                    Picker("Format", selection: $settings.timeFormat) {
+                        ForEach(TimeFormat.allCases, id: \.self) { format in
+                            Text(format.displayName).tag(format)
+                        }
+                    }
+                    .pickerStyle(.menu)
+                }
+            }
+            .navigationTitle("Settings")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Done") {
+                        dismiss()
+                    }
+                }
+            }
+        }
+    }
+}
+
+#Preview {
+    SettingsView()
+}

MultiChrono/Stopwatch.swift

@@ -69,7 +69,7 @@ class Stopwatch: ObservableObject, Identifiable, Codable {
     }
     
     private func startTimer() {
-        timer = Timer.publish(every: 0.01, on: .main, in: .common)
+        timer = Timer.publish(every: 0.001, on: .main, in: .common)
             .autoconnect()
             .sink { [weak self] _ in
                 self?.tick()
@@ -104,16 +104,44 @@ class Stopwatch: ObservableObject, Identifiable, Codable {
         elapsedTime = accumulatedTime + Date().timeIntervalSince(startTime)
     }
     
-    var formattedTime: String {
+    func formattedTime(format: TimeFormat = .cents) -> String {
         let hours = Int(elapsedTime) / 3600
         let minutes = Int(elapsedTime) / 60 % 60
         let seconds = Int(elapsedTime) % 60
-        let tenths = Int((elapsedTime.truncatingRemainder(dividingBy: 1)) * 100)
         
+        switch format {
+        case .millis:
+                let millis = Int((elapsedTime.truncatingRemainder(dividingBy: 1)) * 1000)
                 if hours > 0 {
-            return String(format: "%02i:%02i:%02i.%02i", hours, minutes, seconds, tenths)
+                    return String(format: "%02i:%02i:%02i.%03i", hours, minutes, seconds, millis)
                 } else {
-            return String(format: "%02i:%02i.%02i", minutes, seconds, tenths)
+                    return String(format: "%02i:%02i.%03i", minutes, seconds, millis)
                 }
+        case .cents:
+            let cents = Int((elapsedTime.truncatingRemainder(dividingBy: 1)) * 100)
+            if hours > 0 {
+                return String(format: "%02i:%02i:%02i.%02i", hours, minutes, seconds, cents)
+            } else {
+                return String(format: "%02i:%02i.%02i", minutes, seconds, cents)
+            }
+        case .tenths:
+            let tenths = Int((elapsedTime.truncatingRemainder(dividingBy: 1)) * 10)
+            if hours > 0 {
+                return String(format: "%02i:%02i:%02i.%01i", hours, minutes, seconds, tenths)
+            } else {
+                return String(format: "%02i:%02i.%01i", minutes, seconds, tenths)
+            }
+        case .seconds:
+            if hours > 0 {
+                return String(format: "%02i:%02i:%02i", hours, minutes, seconds)
+            } else {
+                return String(format: "%02i:%02i", minutes, seconds)
+            }
+        }
+    }
+    
+    // Legacy support to avoid breaking existing code immediately
+    var formattedTime: String {
+        formattedTime(format: AppSettings.shared.timeFormat)
     }
 }

MultiChrono/StopwatchRow.swift

@@ -9,6 +9,7 @@ import SwiftUI
 
 struct StopwatchRow: View {
     @ObservedObject var stopwatch: Stopwatch
+    @ObservedObject var settings = AppSettings.shared
     var onDelete: () -> Void
     
     var body: some View {
@@ -16,7 +17,7 @@ struct StopwatchRow: View {
             VStack(alignment: .leading) {
                 Text(stopwatch.name)
                     .font(.headline)
-                Text("\(stopwatch.formattedTime)")
+                Text("\(stopwatch.formattedTime(format: settings.timeFormat))")
                     .font(.largeTitle)
                     .monospacedDigit()
             }
@@ -33,19 +34,9 @@ struct StopwatchRow: View {
                 Image(systemName: stopwatch.isRunning ? "pause.circle.fill" : "play.circle.fill")
                     .resizable()
                     .frame(width: 44, height: 44)
-                    .foregroundStyle(stopwatch.isRunning ? .orange : .green)
+                    .foregroundStyle(stopwatch.isRunning ? .yellow : .green)
             }
             .buttonStyle(PlainButtonStyle())
-            
-            Button(action: onDelete) {
-                Image(systemName: "trash.circle.fill")
-                    .resizable()
-                    .frame(width: 44, height: 44)
-                    .foregroundColor(.red)
-            }
-            .buttonStyle(PlainButtonStyle())
-            .padding(.leading, 10)
-
         }
         .padding(.vertical, 8)
     }