Bring your Live Activity to Apple Watch

1:28 - Existing Live Activity views

struct DeliveryLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(
            for: DeliveryActivityAttributes.self
        ) { context in
            DeliveryActivityContent(context: context)
        } dynamicIsland: { context in
            DynamicIsland {
                DynamicIslandExpandedRegion(.leading) {
                    DeliveryExpandedLeadingView(context: context)
                }
                DynamicIslandExpandedRegion(.trailing) {
                    DeliveryExpandedTrailingView(context: context)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    DeliveryExpandedBottomView(context: context)
                }
            } compactLeading: {
                DeliveryCompactLeading(context: context)
            } compactTrailing: {
                DeliveryCompactTrailing(context: context)
            } minimal: {
                DeliveryMinimal(context: context)
            }
        }
    }
}

3:43 - Preview Live Activities with Xcode Previews

extension DeliveryActivityAttributes.ContentState {
    static var shippedOrder: DeliveryActivityAttributes.ContentState {
        .init(
            status: .shipped,
            courierName: "Johnny"
        )
     }

     static var packedOrder: DeliveryActivityAttributes.ContentState {
         .init(
            status: .packed,
            courierName: "Contacting Courier...")
     }
}

#Preview(
    "Dynamic Island Compact",
    as: .dynamicIsland(.compact),
    using: DeliveryActivityAttributes.preview
) {
    DeliveryLiveActivity()
} contentStates: {
    DeliveryActivityAttributes.ContentState.packedOrder
    DeliveryActivityAttributes.ContentState.shippedOrder
}

4:15 - Add .supplementalActivityFamilies to indicate support for the Smart Stack

struct DeliveryLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(
            for: DeliveryActivityAttributes.self
        ) { context in
            DeliveryActivityContent(context: context)
        } dynamicIsland: { context in
            DynamicIsland {
                DynamicIslandExpandedRegion(.leading) {
                    DeliveryExpandedLeadingView(context: context)
                }
                DynamicIslandExpandedRegion(.trailing) {
                    DeliveryExpandedTrailingView(context: context)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    DeliveryExpandedBottomView(context: context)
                }
            } compactLeading: {
                DeliveryCompactLeading(context: context)
            } compactTrailing: {
                DeliveryCompactTrailing(context: context)
            } minimal: {
                DeliveryMinimal(context: context)
            }
        }
        .supplementalActivityFamilies([.small])
    }
}

4:49 - Customize view layout for the small activity family

struct DeliveryActivityContent: View {
    @Environment(\.activityFamily) var activityFamily
    var context: ActivityViewContext<DeliveryActivityAttributes>

    var body: some View {
        switch activityFamily {
        case .small:
            DeliverySmallContent(context: context)
        case .medium:
            DeliveryMediumContent(context: context)
        @unknown default:
            DeliveryMediumContent(context: context)
        }
    }
}

5:06 - Preview customized layouts for the Smart Stack

#Preview("Content", as: .content, using: DeliveryActivityAttributes.preview) {
   DeliveryLiveActivity()
} contentStates: {
    DeliveryActivityAttributes.ContentState.packedOrder
    DeliveryActivityAttributes.ContentState.shippedOrder
}

8:37 - Use isLuminanceReduced to remove bright elements with Always On Display

struct DeliveryGauge: View {
    @Environment(\.isLuminanceReduced) private var isLuminanceReduced
    var context: ActivityViewContext<DeliveryActivityAttributes>

    var body: some View {
        Gauge(value: context.state.progressPercent) {
            GaugeLabel(context: context)
        }
        .tint(isLuminanceReduced ? .gaugeDim : .gauge)
    }
}

8:57 - For Live Activities with a light appearance, use a light preferredColorScheme

struct DeliveryActivityContent: View {
    @Environment(\.activityFamily) var activityFamily
    var context: ActivityViewContext<DeliveryActivityAttributes>

    var body: some View {
        switch activityFamily {
        case .small:
            DeliverySmallContent(context: context)
                .preferredColorScheme(.light)
        case .medium:
            DeliveryMediumContent(context: context)
        @unknown default:
            DeliveryMediumContent(context: context)
        }
    }
}