what's an efficient way in swift to get a "change of day" event [closed] - swift

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so I've a swift-ui app where I show information for the current day - so at midnight I want it to switch to a new day - trouble is I want this to be as "light" as possible - eg I don't want anything consuming any resources as all I want to do is refresh the view, if it's displayed.
How do I do this without consuming background resources when the view isn't shown?

Answer 1

you could try something like this:
(note I did not wait to see if this works)
import SwiftUI
import Combine
#if os(iOS)
import UIKit
#endif
#main
struct TestApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
struct ContentView: View {
var body: some View {
Text("day change")
.onReceive(NotificationCenter.default.publisher(
for: UIApplication.significantTimeChangeNotification)) { _ in
print("----> day time has changed <----\n")
print("A notification that posts when there is a significant change in time, \n for example, change to a new day (midnight), \n carrier time update, and change to or from daylight savings time.")
}
}
}