App/Widgets/ActivityLayout.swift

 1import SwiftUI
 2import WidgetKit
 3
 4/// `full` in a normal Dynamic Island, `limited` where it is narrow: landscape, iPhone Duo, or several
 5/// activities at once (iOS 27).
 6struct IslandWidth<Full: View, Limited: View>: View {
 7    @ViewBuilder var full: Full
 8    @ViewBuilder var limited: Limited
 9
10    var body: some View {
11        if #available(iOS 27, *) {
12            LimitedWidthReader(full: full, limited: limited)
13        } else {
14            full
15        }
16    }
17}
18
19@available(iOS 27, *)
20private struct LimitedWidthReader<Full: View, Limited: View>: View {
21    @Environment(\.isDynamicIslandLimitedInWidth) private var isLimited
22    var full: Full
23    var limited: Limited
24
25    var body: some View {
26        if isLimited { limited } else { full }
27    }
28}
29
30/// Counts down to `date`, or up from it once passed. Unlike `Text(timerInterval:)` it takes the width of its
31/// digits, not the widest the timer could get.
32func liveTimer(_ date: Date) -> Text {
33    date > .now
34        ? Text(.currentDate, format: .timer(countingDownIn: Date.now..<date))
35        : Text(.currentDate, format: .stopwatch(startingAt: date, maxPrecision: .seconds(1)))
36}