GPS Speedometer app for iOS.

Speedometer utilizing GPS.

Speedo/ContentView.swift

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+//
+//  ContentView.swift
+//  Speedometer
+//
+//  Created by Justin Oros on 5/2/2025.
+//
+
+import SwiftUI
+import CoreLocation
+
+struct ContentView: View {
+    @StateObject private var locationManager = LocationManager()
+    @State private var isMPH = true
+    @State private var previousLocation: CLLocation?
+    @State private var tripDistanceMeters: Double = 0.0
+
+    var currentSpeed: Int {
+        let multiplier = isMPH ? 1.0 : 1.60934 // Already in MPH from LocationManager
+        return Int(Double(locationManager.speed) * multiplier)
+    }
+
+    var unitLabel: String {
+        isMPH ? "mph" : "kph"
+    }
+
+    var distanceLabel: String {
+        let distance = isMPH ? tripDistanceMeters * 0.000621371 : tripDistanceMeters / 1000
+        let roundedDistance = Int(distance.rounded())
+        return "\(roundedDistance) \(isMPH ? "miles" : "km")"
+    }
+
+    var accuracyColor: Color {
+        switch locationManager.accuracy {
+        case ..<10:
+            return .green
+        case 10..<30:
+            return .orange
+        default:
+            return .red
+        }
+    }
+
+    var body: some View {
+        ZStack {
+            Color.black.ignoresSafeArea()
+
+            VStack(spacing: 30) {
+                Spacer()
+
+                // Center Speed Display with Unit
+                HStack(alignment: .bottom, spacing: 4) {
+                    Text("\(currentSpeed)")
+                        .font(.system(size: 140, weight: .bold, design: .rounded))
+                        .foregroundColor(.white)
+
+                    Text(unitLabel)
+                        .font(.title2)
+                        .foregroundColor(.gray)
+                        .onTapGesture {
+                            isMPH.toggle()
+                        }
+                }
+
+                // Trip Distance
+                Text("Trip: \(distanceLabel)")
+                    .font(.title2)
+                    .foregroundColor(.gray)
+
+                // GPS Accuracy Display
+                Text(String(format: "GPS Accuracy: ±%.0f meters", locationManager.accuracy))
+                    .font(.headline)
+                    .foregroundColor(accuracyColor)
+
+                // Reset Button (smaller width)
+                Button(action: {
+                    tripDistanceMeters = 0
+                    previousLocation = nil
+                }) {
+                    Text("Reset Trip")
+                        .font(.headline)
+                        .padding(.horizontal, 20)
+                        .padding(.vertical, 10)
+                        .background(Color.gray)
+                        .foregroundColor(.black)
+                        .cornerRadius(12)
+                }
+
+                Spacer()
+            }
+            .padding()
+
+            // Settings Button (Sprocket icon) at the bottom right with padding
+            VStack {
+                Spacer()
+                HStack {
+                    Spacer()
+                    Button(action: {
+                        if let url = URL(string: UIApplication.openSettingsURLString) {
+                            UIApplication.shared.open(url)
+                        }
+                    }) {
+                        Image(systemName: "gearshape.fill") // Sprocket icon
+                            .font(.title2)
+                            .foregroundColor(.white)
+                            .padding()
+                    }
+                    .padding(.bottom, 10) // Add some bottom padding
+                }
+                .padding(.trailing) // Keep the trailing padding for right alignment
+            }
+        }
+        .alert(isPresented: $locationManager.showAlert) {
+            Alert(
+                title: Text("Location Services"),
+                message: Text(locationManager.alertMessage),
+                dismissButton: .default(Text("Settings")) {
+                    if let url = URL(string: UIApplication.openSettingsURLString) {
+                        UIApplication.shared.open(url)
+                    }
+                }
+            )
+        }
+        .onReceive(locationManager.$location) { location in
+            if let newLocation = location {
+                if let oldLocation = previousLocation {
+                    let distance = newLocation.distance(from: oldLocation)
+                    tripDistanceMeters += distance
+                }
+                previousLocation = newLocation
+            }
+        }
+    }
+}