Cannot get Haptic Feedback to work with Swift - swift

Question

I'm a CS major in college who had an idea for an Apple Watch app that vibrates every time it reaches a certain time interval, for example the user picks intervals of 20s through a picker, taps "start" and the app starts a timer from 0 to 20 and once it reaches 20 I want the watch to vibrate and start counting up to 20 again until the user chooses to stop it. I want to use it for runners to have an idea of consistent paces to run. The problem is that I can't get UIImpactFeedbackGenerator to work and none of the other methods of haptic feedback either. I have no swift experience, only python and Java but I am basically done except for this haptic part. The one error I get is UIImpactFeedbackGenerator is out of scope where the generator is declared under SecondView. Thank you in advance! Here's my code:
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{
let generator = UIImpactFeedbackGenerator(style: .medium)
generator.impactOccurred()
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()
}
}
}

Answer 1

WatchOs does have the play(_:) - method for notification.
try WKInterfaceDevice.current().play(.click)
for more information take a look at the documentation -- https://developer.apple.com/documentation/watchkit/wkinterfacedevice/1628128-play