For an existing iOS app, Multipeer Connectivity can discover nearby devices and exchange messages, streams, or files without requiring internet access. Apple has deprecated the framework and recommends the Network framework for new development and migration, so Multipeer Connectivity is best treated as a legacy option to maintain—not the default for a new feature.
How offline sharing works
Multipeer Connectivity lets nearby devices find services offered by your app and communicate over a local connection. Apple documents infrastructure Wi-Fi, peer-to-peer Wi-Fi, and Bluetooth personal area networks as underlying transports. Internet access is not described as a prerequisite, but availability of a local transport does not guarantee that devices will connect in every environment.
The API separates discovery from communication: the app advertises and browses for a service, a peer is invited, and connected devices exchange data through an MCSession. This is an app-to-app networking framework, not a general-purpose iPhone setting for sharing arbitrary content.
How the Multipeer Connectivity flow fits together
1. Identify the local device
Create an MCPeerID for the local app participant. It identifies that peer within the framework’s discovery and session flow.
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2. Advertise and browse for a service
Use MCNearbyServiceAdvertiser to announce the app’s service, and MCNearbyServiceBrowser to look for nearby devices advertising the matching service. Apple’s Multipeer Connectivity overview and peer-discovery example describe this discovery model. The advertiser and browser have separate roles; discovery alone does not create a communication session.
3. Invite a peer and establish a session
When the app finds a suitable peer, it can invite that peer to connect. After the invitation is accepted, an MCSession tracks the connected peers and carries communication. Apple documents a limit of up to eight peers in a session, counting the local device. That is an API ceiling, not a recommendation or a promise about performance.
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4. Choose the communication mode
- Messages: send discrete data, such as a small structured update.
- Streams: use a continuous stream when the exchange is ongoing.
- Resources: transfer file-like payloads through the framework’s resource-transfer facilities.
Apple documents these communication modes but the cited API material does not establish throughput or payload-size thresholds. Choose based on the shape of the data, then test the actual workload and connection conditions your app needs to support.
Configure local-network access and Bonjour
An app that uses the local network needs an NSLocalNetworkUsageDescription entry in its Info.plist. Use a clear explanation of why the app looks for nearby devices and what the user can do with the connection. Apps that use Bonjour also declare the services they browse for in NSBonjourServices. Follow Apple’s framework documentation for the current configuration requirements.
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These declarations explain the app’s local-network use; they do not ensure that a peer is discoverable or that a session will succeed. The user’s local-network permission and the availability of a supported local transport are part of the connection conditions.
Should you use it for a new app?
Apple marks Multipeer Connectivity and its core API references as deprecated and recommends migrating to the Network framework. For a new offline-sharing feature, start with Apple’s current Multipeer Connectivity guidance and follow its link to TN3213 for migration advice. The recommendation is clear, but do not assume the two frameworks have a one-to-one class or method mapping.
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- Maintaining an existing app: understand the current discovery, invitation, session, and transfer behavior before changing it; use Apple’s migration guidance when planning the replacement.
- Building a new feature: evaluate the Network framework rather than introducing a deprecated API.
- Choosing a design: account for the desired communication pattern, number of devices, local-network permissions, Bonjour configuration where applicable, and the transports available in the intended environment.
What to plan for in a real deployment
Do not treat the eight-peer limit as evidence that a particular group size will perform well. Test the number of devices, data patterns, and environments your product actually supports. The documented transports explain why offline communication is possible; they do not specify a universal range, speed, or reliability guarantee.
Also plan how the app handles interruptions and lifecycle changes. Discovery and sessions are separate parts of the design, so recovery may require renewed discovery or session setup. Consult current Apple documentation for behavior that applies to your deployment target rather than relying on an assumed reconnection recipe.
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