Bridging Apps with iOS Multipeer Connectivity

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Bridging Apps with iOS Multipeer Connectivity Zamzam Farzamipooya Engineering Manager @ Veo @zamzampooya SwiftCraft 2024

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What Is Multipeer Connectivity Support peer-to-peer connectivity and the discovery of nearby devices In iOS, the framework uses infrastructure Wi-Fi networks, peer-to-peer Wi-Fi, and Bluetooth personal area networks for the underlying transport. In macOS and tvOS, it uses infrastructure Wi-Fi, peer-to-peer Wi-Fi, and Ethernet.

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Why Multipeer Connectivity? Decentralized Network No Internet Required Ease of Use Adaptive Connectivity Versatility

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Why Not? Limited Range Performance Variability Complex Network Management Compatibility

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What It Can Be Used For Collaborative tools Messaging Education Location based Social Networking Gaming!

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Multipeer Connectivity Framework Key Concepts Session objects (MCSession) support communication between connected peer devices. Advertiser objects (MCNearbyServiceAdvertiser) tell nearby peers that your app is willing to join sessions of a specified type. Browser objects (MCNearbyServiceBrowser) let your app search programmatically for nearby devices with apps that support sessions of a particular type. Peer IDs (MCPeerID) uniquely identify an app running on a device to nearby peers.

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How It Works Advertiser Browser It is findable It can find other advertisers Finds an Advertiser Sends Invite Receives Invite Accepts Invite Connected Session They can send and receive data

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Tic-Tac-Toe Find nearby players Connect to one opponent Play!

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Setting Up Info.plist Getting permissions from the user Privacy — Local Network Usage Description Also we need to add the following to Info.plist

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MCManager ServiceType -> The same name as in the info.plist Advertiser Browser Session Players

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Player A model to keep track of players MCPeerID Name MCSessionState PlayerType

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Setting Up The Environment PeerID CurrentPlayer Session Advertiser Browser Their delegates

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Starting The Sessions

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Starting The Sessions .addPlayer .findingPlayers .play

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Add Player .addPlayer .findingPlayers We need to have a list of all nearby peers

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Informs us when a peer is found Informs us when a peer is lost MCNearbyServiceBrowserDelegate

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Showing Nearby Peers Using availablePlayers list to show nearby peers Inviting peers to join our session

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Incoming invitation request Automatically connect Or show and alert for connection request MCNearbyServiceAdvertiserDelegate

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MCSessionDelegate Called when the state of a nearby peer changes

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When Connected From .addPlayer or .findingPlayers To .play

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MCSessionDelegate Data Handling - Sending https://developer.apple.com/documentation/multipeerconnectivity/mcsession

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Send playerType on Connection The starter is X and the other is O

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MCSessionDelegate Data Handling - Message

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MCSessionDelegate Data Handling - Receiving

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MCSessionDelegate Data Handling - Decoding

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Game Logic @1TheSwiftGuy

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Sending Game Logic

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Demo Time! Let’s play

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Challenges Background mode and reestablishing the connection Debugging Unexpected behaviour Poor

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Future of Multipeer Connectivity Cross-Platform Compatibility Enhanced Performance and Reliability Integration with IoT and Smart Devices Better support for background mode

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@zamzampooya #WomenLifeFreedom Thank You