Setting up

This project is going to give you some practice with collection views, the image picker and GCD, but at the same time introduce you to a new technology called the multipeer connectivity framework. This is a way to let users form impromptu connections to each other and send data, rather like BitTorrent.

The app we're going to make will show photos of your choosing in a collection view. That much is easy enough, because we did pretty much that already in project 10. But this time there's a subtle difference: when you add a photo it's going to automatically send it to any other devices you are currently connected to, and any photos they select will appear for you.

Create a new Single View App project in Xcode, naming it Project25. Please note: the nature of peer-to-peer apps is that you need to have at least two copies of your app running, one to send and one to receive. There are a few ways of setting this up, but I recommend using one physical device talking to the iOS simulator – that’s more than enough.

Sponsor Hacking with Swift and reach the world's largest Swift community!

Swift breaks down barriers between ideas and apps, and I want to break down barriers to learning it. I’m proud to make hundreds of tutorials that are free to access, and I’ll keep doing that whatever happens. But if that’s a mission that resonates with you, please support it by becoming a HWS+ member. It’ll bring you lots of benefits personally, but it also means you’ll directly help people all over the world to learn Swift by freeing me up to share more of my knowledge, passion, and experience for free! Become Hacking with Swift+ member.

< Overview		Next: Importing photos again >
Table of Contents