SwiftUI Simple Stopwatch

SwiftUI Simple Stopwatch

ContentView.swift

 
//
//  ContentView.swift
//  Test
//
//  Created by Cairocoders
//

import SwiftUI

struct ContentView: View {
    
    @ObservedObject var stopWatchManager = StopWatchManager()
    
    var body: some View {
        ZStack {
            LinearGradient(gradient: Gradient(colors: [Color.red, Color.purple]), startPoint: .top, endPoint: .bottom)
                .edgesIgnoringSafeArea(.vertical)
            
            VStack {
                Text(String(format: "%.1f", stopWatchManager.secondsElapsed))
                    .font(.system(size: 60))
                    .foregroundColor(.white)
                    .padding(.top, 200)
                    .padding(.bottom, 100)
                    .padding(.trailing, 100)
                    .padding(.leading, 100)
                if stopWatchManager.mode == .stopped {
                    Button(action: {self.stopWatchManager.start()}) {
                        TimerButton(label: "Start", buttonColor: .green, textColor: .white) //CMD-click and select Extract Subview
                    }
                }
                if stopWatchManager.mode == .running {
                    Button(action: {self.stopWatchManager.pause()}) {
                        TimerButton(label: "Pause", buttonColor: .green, textColor: .white)
                    }
                }
                if stopWatchManager.mode == .paused {
                    Button(action: {self.stopWatchManager.start()}) {
                        TimerButton(label: "Start", buttonColor: .green, textColor: .white)
                    }
                    Button(action: {self.stopWatchManager.stop()}) {
                        TimerButton(label: "Stop", buttonColor: .red, textColor: .white)
                    }
                    .padding(.top, 30)
                }
                
                Spacer()
            }
        }
    }
}

struct TimerButton: View {
    
    let label: String
    let buttonColor: Color
    let textColor: Color
    
    var body: some View {
        Text(label)
            .foregroundColor(textColor)
            .padding(.vertical, 20)
            .padding(.horizontal, 90)
            .background(buttonColor)
            .cornerRadius(10)
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

StopWatchManager.swift

 
//
//  StopWatchManager.swift
//  Test
//
//  Created by Cairocoders
//

import Foundation
import SwiftUI

class StopWatchManager: ObservableObject {
    
    enum stopWatchMode {
        case running
        case stopped
        case paused
    }
    
    @Published var mode: stopWatchMode = .stopped
    
    @Published var secondsElapsed = 0.0
    var timer = Timer()
    
    func start() {
        mode = .running
        timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { timer in
            self.secondsElapsed += 0.1
        }
    }
    
    func pause() {
        timer.invalidate()
        mode = .paused
    }
    
    func stop() {
        timer.invalidate()
        secondsElapsed = 0
        mode = .stopped
    }
}