A wrapper for Apple’s MultipeerConnectivity framework for offline data transmission between Apple devices. This framework makes it easy to automatically connect to multiple nearby devices and share information using either bluetooth or wifi radios.

1. Features
2. Integration
   • CocoaPods
   • Carthage
   • Swift Package Manager
3. Usage
4. Example
5. License
6. Authors

Features

• [x] Supports iOS/macOS/tvOS
• [x] Auto Connection
• [x] Auto Invitations/Advertising
• [x] Send/Receive data via MultipeerConnectivity Framework
• [x] Specify data types for easy handling

Integration

CocoaPods

You can use CocoaPods to install MultiPeer by adding it to your Podfile:

pod 'MultiPeer'

Carthage

You can use Carthage to install MultiPeer by adding it to your Cartfile:

github "dingwilson/MultiPeer"

Swift Package Manager

For SPM, add the following to your package dependencies:

.package(url: "https://github.com/dingwilson/MultiPeer.git", .upToNextMinor(from: "0.0.0"))

Usage

To get started, import MultiPeer.

import MultiPeer

Then, simply initialize MultiPeer with the name of your session (serviceType). There are two modes of connections (advertiser and browser). To utilize both, simply use .autoConnect().

MultiPeer.instance.initialize(serviceType: "demo-app")
MultiPeer.instance.autoConnect()

Any data transmitted by MultiPeer will always be accompanied by a numerical “type”, to ensure other peers know what kind of data is being received, and how to properly process it. You can manage this by creating a UInt32 enum, as shown below:

enum DataType: UInt32 {
  case string = 1
  case image = 2
  // ...
}

To send data, simply use the .send(object: type:) function:

MultiPeer.instance.send(object: "Hello World!", type: DataType.string.rawValue)

To receive data, we must conform to the MultiPeerDelegate protocol:

func multiPeer(didReceiveData data: Data, ofType type: UInt32, from peerID: MCPeerID) {
  switch type {
    case DataType.string.rawValue:
      let string = data.convert() as! String
      // do something with the received string
      break

    case DataType.image.rawValue:
      let image = UIImage(data: data)
      // do something with the received UIImage
      break

    default:
      break
  }
}

func multiPeer(connectedDevicesChanged devices: [String]) {
}

Ensure that you set the MultiPeer delegate.

MultiPeer.instance.delegate = self

Finally you’ll need to enable incoming / outgoing connections in your entitlements.

Congratulations! You have successfully sent data using MultiPeer! For more detailed information (including details of other functions), please see the docs.

Example

For an example app using MultiPeer, checkout MultiPeer_Sample.

License

MultiPeer is released under an MIT License. See LICENSE for details.

Authors

• Wilson Ding

Project heavily inspired by Apple-Signal.