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WWDC21 · 25 min · Audio & Video

Build custom experiences with Group Activities

Go beyond basic streaming and interaction and discover how you can build advanced SharePlay experiences using the full power of the Group Activities framework. We’ll show you how to adapt a simple drawing app into a real-time shared canvas, explore APIs like GroupSessionMessenger — which helps send and receive custom messages between participants in the group — and learn how to put the finishing touches on a custom SharePlay experience.

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Code shown on screen · 2 snippets

Configuring your application’s activity swift · at 3:50 ↗ 
struct DrawTogether: GroupActivity {

    var metadata: GroupActivityMetadata {
        var metadata = GroupActivityMetadata()
        metadata.title = NSLocalizedString("Draw Together",
                                           comment: "Title of group activity")
        metadata.type = .generic
        return metadata
    }

}
Define, Receive and Send messages swift · at 10:06 ↗ 
let messenger = GroupSessionMessenger(session: groupSession)

// 1. Define
struct UpsertStrokeMessage: Codable {
    let id: UUID
    let color: Color
    let point: CGPoint
}

// 2. Receive
for await (message, context) in messenger.messages(of: UpsertStrokeMessage.self) {
    // Handle message
}

// 3. Send
do {
    try await messenger.send(UpsertStrokeMessage(id: stroke.id, color: .red, point: point))
} catch {
    // Handle error
}

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