LiveActivity not updating via AppIntent Button

Question

I'm trying to update a dynamic property of a live activity but I can only get it to work when using a button inside the app, not with a button inside the LiveActivity. Can you help me understand where I'm going wrong?

Given these Activity Attributes:

struct MyWidgetsAttributes: ActivityAttributes {
    public struct ContentState: Codable, Hashable {
        // Dynamic stateful properties about your activity go here!
        var startedAt: Date
        var timerRuns: Bool
        var remainingTime: Double
    }
    
    // Fixed non-changing properties about your activity go here!
    var name: String
}

The following code inside the app works perfectly and after tapping it timerRuns gets set to false:

Button {
      let state = MyWidgetsAttributes.ContentState(startedAt: goal.startedAt, timerRuns: false, remainingTime: goal.remainingTime)
                                    
      let content = ActivityContent(state: state, staleDate: Date().addingTimeInterval(60))
                                    
      Task{
           await activity?.update(content)
      }
      } label: {
           Text("Pause/Resume")
               .foregroundStyle(.white)
               .padding()
               .background(.primary)
               .clipShape(RoundedRectangle(cornerRadius: 10))
      }
}

However I would like to have a button that does the same inside the live activity so I created the following AppIntent:

struct PauseResume: AppIntent {
    
    static var title: LocalizedStringResource = .init(stringLiteral: "Pause/Resume Timer")
    
    @Parameter(title: "ID")
    var id: String
    
    init() {
        
    }
    
    init(id:String) {
        self.id = id
    }
    
    func perform() async throws -> some IntentResult {
        
        if let activity = Activity<MyWidgetsAttributes>.activities.first(where: { $0.attributes.name == id }) {
            let state = MyWidgetsAttributes.ContentState(startedAt: activity.content.state.startedAt, timerRuns: false, remainingTime: activity.content.state.remainingTime)
                
                let content = ActivityContent(state: state, staleDate: Date().addingTimeInterval(60))
                
            Task{
                await activity.update(content)
            }
        }
        WidgetCenter.shared.reloadAllTimelines()
        return .result()
    }
}

and this button inside the liveActivity:

struct MyWidgetsLiveActivity: Widget {
    
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: MyWidgetsAttributes.self) { context in
            // Lock screen/banner UI goes here
            HStack {
                HStack {
                    Text(context.attributes.name)
                        .font(.title2)
                        .bold()
                        .multilineTextAlignment(.leading)
                    Text(String(context.state.timerRuns))
                    Button (intent: PauseResume(id: context.attributes.name)) {
                        Image(systemName: "pause.circle.fill")
                    }
                .buttonBorderShape(.circle)
...

The button inside the app works just fine but this one does nothing and on the lock screen I keep seeing the name of the activity followed by "true" as if it didn't update or the variable never got updated in the first place

Happy to provide any additional info if it helps

Answer 1

If it can help anyone in the future, I just solved this by adding the LiveActivityIntent Protocol

So from this:

struct PauseResume: AppIntent

To this:

struct PauseResume: AppIntent, LiveActivityIntent

And now the button works just fine!