In all tutorials and in official documentation I only see initialization of timer straight up when the view loads.
@State private var timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
and later on
.onReceive(timer) {....}
but how should I init timer only on button click and assign it to the unassigned / not connected timer.
Later on I will need to cancel and reconnect, but that is not the issue here. Issue here is connecting only after button click.
I tried to init it like this
@State private var timer: Cancellable?
....
timer = Timer.publish(every: 1, on: .main, in: .common).connect()
But I can not call onReceive on timer inited like this, because first:
Protocol 'Cancellable' as a type cannot conform to 'Publisher'
and second
Argument type 'Cancellable?' does not conform to expected type 'Cancellable'
Just put the timer in a child view and control its visibility with a bool. When the TimerView is removed the state is destroyed and the timer stops.
struct ContentView: View {
@State var started = false
var body: some View {
VStack {
Button(started ? "Stop" : "Start") {
started.toggle()
}
if started {
TimerView()
}
}
}
}
struct TimerView: View {
@State private var timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
...
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