I've been trying to implement this in SwiftUI but I've been having the same problem where it won't update the selection the first time. I've tried the solution above but they didn't work for me. Does anyone have any ideas on how you'd implement this in SwiftUI, and what would I set the Binded variable in the view as?
This is my Code:
import SwiftUI
struct DurationPicker: UIViewRepresentable {
@Binding var duration: Double
func makeUIView(context: Context) -> UIDatePicker {
let datePicker = UIDatePicker()
datePicker.datePickerMode = .countDownTimer
datePicker.addTarget(context.coordinator, action: #selector(Coordinator.updateDuration), for: .valueChanged)
return datePicker
}
func updateUIView(_ datePicker: UIDatePicker, context: Context) {
datePicker.countDownDuration = duration
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
class Coordinator: NSObject {
let parent: DurationPicker
init(_ parent: DurationPicker) {
self.parent = parent
}
@objc func updateDuration(datePicker: UIDatePicker) {
parent.duration = datePicker.countDownDuration
}
}
}
struct ContentView: View {
@State var duration = 60.0
@State var timeRemaining = 60.0
@State private var isActive = false
var timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
var body: some View {
VStack {
Text("\(timeRemaining)")
.bold()
.font(.largeTitle)
DurationPicker(duration: $duration)
HStack {
Button("Cancel") {
isActive = false
}
.padding()
Button("Start") {
self.timeRemaining = duration
isActive = true
}
.padding()
}
}
.onReceive(timer) { time in
guard self.isActive else { return }
if self.timeRemaining > 0 {
self.timeRemaining -= 1
}
}
.onReceive(NotificationCenter.default.publisher(for: UIApplication.willResignActiveNotification)) { _ in
self.isActive = false
}
.onReceive(NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)) { _ in
self.isActive = true
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
SebastianBanks
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I have the same problem and I'm not connected to an external monitor at all. It might be memory related