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TimerTrouble.swift
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TimerTrouble.swift
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import SwiftUI
@main
struct TimerTrouble: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
struct ContentView: View {
@State
private var timerIsShowing = true
var body: some View {
VStack {
if timerIsShowing {
TimerView()
}
Button(timerIsShowing ? "Hide timer" : "Show timer") {
timerIsShowing = !timerIsShowing
}
}
}
}
class TimerViewModel: ObservableObject {
@Published
private(set) var elapsed: Int = 0
var isInactive: Bool {
timer == nil
}
private var timer: Timer?
func startTimer() {
timer?.invalidate()
timer = Timer.scheduledTimer(
withTimeInterval: 1,
repeats: true
) { [weak self] timer in
self?.elapsed += 1
}
}
func stopTimer() {
timer?.invalidate()
timer = nil
objectWillChange.send()
}
}
struct TimerView: View {
@StateObject
private var vm = TimerViewModel()
var body: some View {
VStack {
Button(
vm.isInactive ? "start" : "stop",
action: vm.isInactive ? vm.startTimer : vm.stopTimer
)
Text(String(vm.elapsed))
}
}
}