Date only updates when app is refreshed SwiftUI - swiftui

Question

I want to print the date, however, it states the sam until I refresh the app. this is my code
struct Dates: View {
func todayDate() -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ssZ"
let today = Date() /// Date() is the current date
let todayAsString = dateFormatter.string(from: today)
return todayAsString
}
var body: some View {
Text(todayDate())
Would anyone know why this is happening?

Answer 1

Display Live Time in SwiftUI
You need to create a Timer with the time interval you want to update the Date label. In this case we will update the label every 1 second. First, the ViewModel (the Timer cannot be declared inside the SwiftUI View because it is an struct):
class ViewModel: ObservableObject {
#Published var currentTime = ""
var timer = Timer()
init() {
let repeatEveryXSeconds: TimeInterval = 1
timer = Timer.scheduledTimer(withTimeInterval: repeatEveryXSeconds, repeats: true, block: { [weak self] timer in
self?.currentTime = DateFormatter.myFormatter.string(from: Date())
})
}
}
extension DateFormatter {
static let myFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "hh:mm:ss"
return formatter
}()
}
And the view itself:
struct ContentView: View {
#StateObject private var viewModel = ViewModel()
var body: some View {
Text("Date is: \(viewModel.currentTime)")
.frame(width: 200)
.padding()
}
}
You can use also CalendarUserNotifications triggers: https://developer.apple.com/documentation/usernotifications/scheduling_a_notification_locally_from_your_app