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2:36 - Define the Live Activity data model

import ActivityKit

struct CurtainActivityAttributes: ActivityAttributes {
    let scenesPerAct: [Int]
    let showTitle: String

    struct ContentState: Codable, Hashable {
        var isPlaying: Bool
        var curtainOpen: Bool
        var actIndex: Int
        var sceneIndexInAct: Int
    }
}

3:20 - Configure compact, minimal, and expanded views

import SwiftUI
import WidgetKit

struct CurtainActivityWidget: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(
            for: CurtainActivityAttributes.self
        ) { context in
            CurtainActivityMenuBarExpandedContent(
                state: context.state,
                showTitle: context.attributes.showTitle)
        } dynamicIsland: { context in
            DynamicIsland {
                DynamicIslandExpandedRegion(.leading) {
                    CurtainLabel(state: context.state)
                }
                DynamicIslandExpandedRegion(.trailing) {
                    ActLabel(state: context.state)
                }
                DynamicIslandExpandedRegion(.center) {
                    SceneLabel(state: context.state)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    ExpandedBottom(state: context.state)
                }
            } compactLeading: {
                StatusGlyph(state: context.state)
            } compactTrailing: {
                CompactTrailing(state: context.state)
            } minimal: {
                StatusGlyph(state: context.state)
            }
        }
    }
}

5:23 - Update a running Live Activity

contentState.curtainOpen = false
let content = ActivityContent(
    state: self.currentContentState, staleDate: nil
)
await activity.update(
    content, alertConfiguration: alertConfiguration
)

6:02 - Define an App Intent action

struct SetPlacesReadyIntent: AppIntent {
    // ...
    func perform() async throws -> some IntentResult {
        // ...
        var state = activity.content.state
        state.placesReady = self.ready
        let content = ActivityContent(state: state, staleDate: nil)
        await activity.update(
            content,
            alertConfiguration: .announcement(self.ready ? "Ready" : "Not Ready")
        )
        return .result()
    }
}

6:16 - Trigger the intent from buttons

private struct PlacesReadyButtons: View {
    var body: some View {
        HStack {
            Button(intent: SetPlacesReadyIntent(ready: false)) {
                Text("Not Ready")
            }
            .tint(.red)
            Button(intent: SetPlacesReadyIntent(ready: true)) {
                Text("Ready")
            }
            .tint(.green)
        }
    }
}

6:32 - End a Live Activity

// End a Live Activity
await activity.end(nil, dismissalPolicy: .immediate)