Update Live Activities with push notifications

3:53 - Enabling push updates

func startActivity(hero: EmojiRanger) throws {
    let adventure = AdventureAttributes(hero: hero)
    let initialState = AdventureAttributes.ContentState(
        currentHealthLevel: hero.healthLevel,
        eventDescription: "Adventure has begun!"
    )

    let activity = try Activity.request(
        attributes: adventure,
        content: .init(state: initialState, staleDate: nil),
        pushType: .token
    )

    Task {
        for await pushToken in activity.pushTokenUpdates {
            let pushTokenString = pushToken.reduce("") { $0 + String(format: "%02x", $1) }
            
            Logger().log("New push token: \(pushTokenString)")
            
            try await self.sendPushToken(hero: hero, pushTokenString: pushTokenString)
        }
    }
}

6:54 - APNs push payload: Updating

{
    "aps": {
        "timestamp": 1685952000,
        "event": "update",
        "content-state": {
            "currentHealthLevel": 0.941,
            "eventDescription": "Power Panda found a sword!"
        }
    }
}

7:37 - Printing content state JSON

let contentState = AdventureAttributes.ContentState(
    currentHealthLevel: 0.941,
    eventDescription: "Power Panda found a sword!"
)

let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted

let json = try! encoder.encode(contentState)
Logger().log("\(String(data: json, encoding: .utf8)!)")

9:18 - Terminal: Constructing an APNs request with curl

curl \
  --header "apns-topic: com.example.apple-samplecode.Emoji-Rangers.push-type.liveactivity" \
  --header "apns-push-type: liveactivity" \
  --header "apns-priority: 10" \
  --header "authorization: bearer $AUTHENTICATION_TOKEN" \
  --data '{
      "aps": {
          "timestamp": '$(date +%s)',
          "event": "update",
          "content-state": {
              "currentHealthLevel": 0.941,
              "eventDescription": "Power Panda found a sword!"
          }
      }
  }' \
  --http2 https://api.sandbox.push.apple.com/3/device/$ACTIVITY_PUSH_TOKEN

14:21 - APNs push payload: Alerting

{
    "aps": {
        "timestamp": 1685952000,
        "event": "update",
        "content-state": {
            "currentHealthLevel": 0.0,
            "eventDescription": "Power Panda has been knocked down!"
        },
        "alert": {
            "title": "Power Panda is knocked down!",
            "body": "Use a potion to heal Power Panda!",
            "sound": "default"
        }
    }
}

14:56 - APNs push payload: Alert localization

{
    "aps": {
        "timestamp": 1685952000,
        "event": "update",
        "content-state": {
            "currentHealthLevel": 0.0,
            "eventDescription": "Power Panda has been knocked down!"
        },
        "alert": {
            "title": {
                "loc-key": "%@ is knocked down!",
                "loc-args": ["Power Panda"]
            },
            "body": {
                "loc-key": "Use a potion to heal %@!",
                "loc-args": ["Power Panda"]
            },
            "sound": "HeroDown.mp4"
        }
    }
}

15:25 - APNs push payload: Alert sound

{
    "aps": {
        "timestamp": 1685952000,
        "event": "update",
        "content-state": {
            "currentHealthLevel": 0.0,
            "eventDescription": "Power Panda has been knocked down!"
        },
        "alert": {
            "title": {
                "loc-key": "%@ is knocked down!",
                "loc-args": ["Power Panda"]
            },
            "body": {
                "loc-key": "Use a potion to heal %@!",
                "loc-args": ["Power Panda"]
            },
            "sound": "HeroDown.mp4"
        }
    }
}

15:52 - APNs push payload: Dismissal

{
    "aps": {
        "timestamp": 1685952000,
        "event": "end",
        "dismissal-date": 1685959200,
        "content-state": {
            "currentHealthLevel": 0.23,
            "eventDescription": "Adventure over! Power Panda is taking a nap."
        }
    }
}

16:44 - APNs push payload: Stale date

{
    "aps": {
        "timestamp": 1685952000,
        "event": "update",
        "stale-date": 1685959200,
        "content-state": {
            "currentHealthLevel": 0.79,
            "eventDescription": "Egghead is in the woods and lost connection."
        }
    }
}

16:54 - Displaying a stale Live Activity UI

struct AdventureActivityConfiguration: Widget {
    
    var body: some WidgetConfiguration {
        
        ActivityConfiguration(for: AdventureAttributes.self) { context in
            AdventureLiveActivityView(
                hero: context.attributes.hero,
                isStale: context.isStale,
                contentState: context.state
            )
            .activityBackgroundTint(Color.gameWidgetBackground)
        }  dynamicIsland: { context in
            // ...
        }
        
    }
    
}

17:19 - APNs push payload: Relevance score

{
    "aps": {
        "timestamp": 1685952000,
        "event": "update",
        "relevance-score": 100,
        "content-state": {
            "currentHealthLevel": 0.941,
            "eventDescription": "Power Panda found a sword!"
        }
    }
}