Is there a way to get my Apple Watch App to vibrate when the screen sleeps? - swift

Question

I own a Apple Watch series 3 and I made an app for it that vibrates every specified amount of seconds. I know haptics drain your battery but, regardless, its the purpose of my app. I tried to test it on my watch and I encountered a problem. When the screen is on the app functions like its supposed to but as soon as I put my wrist down and the screen sleeps, the app runs in the background but it doesn't vibrate like supposed to. Is there a way around this? Like I said I have a series 3 therefore I don't have access to the always on screen display function.
My app code is below:
import SwiftUI
struct ContentView: View {
#State var timerScreenShown = false
#State var timeVal = 10
var body: some View {
VStack{
Text("Select \(timeVal)s intervals").padding()
Picker(
selection: $timeVal,
label: Text("")){
ForEach(10...120, id: \.self) {
Text("\($0)")
}
}
NavigationLink(destination: SecondView(timerScreenShown: $timerScreenShown, timeVal: timeVal), isActive: $timerScreenShown, label: {Text("Go")})
}
}
}
struct SecondView: View{
#Binding var timerScreenShown:Bool
#State var timeVal = 10
#State var startVal = 0
var body: some View {
VStack{
if timeVal > 0 {
Text("Timer")
.font(.system(size: 14))
Text("\(startVal)")
.font(.system(size: 40))
.onAppear(){
Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in
if self.timeVal > 0{
self.startVal += 1
if self.timeVal == self.startVal{
WKInterfaceDevice.current().play(.failure)
self.startVal = 0
}
}
}
}
Text("seconds")
.font(.system(size: 14))
Button(action: {
self.timerScreenShown = false
}) {
Text("Cancel")
.foregroundColor(.red)
}
} else {
Button(action: {
self.timerScreenShown = false
}) {
Text("Done")
.foregroundColor(.green)
}
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
Group {
ContentView()
ContentView()
}
}
}