Project25

Project 25. Selfie Share.

Concepts

• Collection Views
• Grand Central Dispatch
• Image Picker
• Multipeer connectivity framework.

Notes

Multipeer connectivity requires four classes:

1. MCSession is the manager class that handles al multipeer connectivity for us.
2. MCPeerID identifies each user uniquely in a session.
3. MCAdvertiserAssistant is used when creating a session, telling others that we eist and handling invitations.
4. MCBrowserViewController is used when looking for sessions, showing users who is nearby and letting them join.

These classes are defined in the multipeer framework: import MultipeerConnectivity.

All multipeer services on iOS must declare a service type, which is a 15-digit string that uniquely identify your service. Those 15 digits can contain only the letters A-Z, numbers and hyphens. It's usually preferred to include your company in there somehow.

The service type is used by both MCAdvertiserAssistant and MCBrowserViewController to make sure your users only see other users of the same app. The also want a reference to the MCSession instance so they can take care of connections for you.

When a user connects or disconnects from our session, the method session(_:peer:didChangeState:) is called so you know what's changed - is someone connecting,are they now connected, or have they just disconnected?