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First of all, the app will be parted by two view controllers: In the first one, the user will be able to “sign in” to the app by providing a nickname only (we’ll avoid a more complicated login mechanism for obvious reasons).

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Just note that even if you get the final project to test the app without getting involved in the implementation at all, the server part is something you have to mandatorily do if you want to see the app running.

Additionally, even though I won’t show any server-side code at all in this tutorial, I’ll be talking quite frequently about the server part because in every single step it’s important to make clear what kind of data we are expecting from the server, or what the server is expecting from the app.

Thankfully, there’s a better solution when it’s necessary to receive data from a server instantly (every time such data becomes available), and without having the app to send any request to the server at all.

That solution is based on making use of websockets, and it totally erases the couple aforementioned issues.

Besides that, the term “client” refers to any application that can get connected to a server: Web, mobile or desktop app.

However, by saying “client” in this text we’ll be referring to i OS apps, and to our demo app more specifically later on.Besides sending and getting messages, we’ll add a couple of other interesting features to the app: We’ll display a popup label when a new user is getting connected to the chat, or an existing one leaves it.Furthermore, when one or more users are typing messages, the other users will be notified for that by a label that will appear right above the textview used to write messages.Apart from the starter project that you have to download, you must also grab another file from here.For now just get the file, and you’ll see next how to use it.The websocket communication relies on the client-server logic, where a persistent connection between a server and a client always exists.

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