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Let’s get right to it! Use Mapbox to Draw a Polyline There it is! We have a method which simply extracts the key informations from the messages being sent! We are going to modify this callback in order to map the data. In our case, the JSON is a simple dictionary holding three values: the longitude, latitude and altitude. On our side we need to implement the callback which will be listening for his messages. Every time our friend has a new position, he will send a message on the channel. This channel must be the same as the one where your friend’s location information is being broadcasted. Feel to choose any name you want!įinally we subscribe to the channel. The following one defines our channel based on its name. The second line sets the configurations we had already defined. So we must also define our view controller as being a PubNub delegate: To keep it simple they are methods called when the connection succeeds, fails, or more interestingly when a message is sent on the channel we are subscribed to. As a result, there is a long list of callbacks we can implement. This means that our view controller will be holding overridden methods that will be called every time an event occurs. We start by setting our current view controller class as the PubNub delegate. It’ll be up to you to rearrange it anyways you want to fit your needs!

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Starting The Connection To PubNubįor the sake of simplicity, we will put most of our code in the viewDidLoad method of a single view controller.

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Our free Sandbox tier should give you all the bandwidth you need to build and test your messaging app with the web messaging API. Once you sign up, you can get your unique PubNub keys in the PubNub Developer Dashboard. To get your unique pub/sub keys, you’ll first need to sign up for a PubNub account.

When a user connects to PubNub, he is identified with the content of this PNConfig object. The other sets configuration variables in order to connect to PubNub. The first variable represents the PubNub channel to which we will subscribe. Let’s first look into some of our class’ variables: Now that you got the gist of it, let’s get into the coding! Setting The View Controller’s Variables This broadcasting of the location has been described in a previous blog entry we encourage you to read! In this article, we will describe the process of getting this information via PubNub and drawing your friend’s commute on a map. In our app, we will be listening to a friend who will be sending us frequent information on his current position. Use PubNub to Know Where Your Friends Are in Real time It’ll be something like “YourProject/YourProject-Bridging-Header.h”Īt this point, we should be all set! We can finally start coding! Let’s roll. Set the “install Objective-C Bridging Header” to Yes and in “Objective-C Bridging Header” type the path from your project’s root directory to your bridging header. Now in your project’s configuration panel, go to build settings and scroll down to the “Swift Compiler – Code Generation” section. Create a new Objective-C header in your project called YourProject-Bridging-Header.h for good practice, and type: All you need to do now is to build a bridging header. The PubNub library is written in Objective-C, but we are coding in Swift. That wasn’t too hard right? It’s not quite over though. You can make sure you are using the latest version of PubNub here.Ĭlose Xcode, and open the YourProject.xcworkspace. Easy installation and starter’s guide here! If you don’t use it yet, you’re missing out. Let’s start by setting up our project properly! We will want to use the PubNub SDK for iOS. We’ve included a migration guide to help you move from 3.x to 4.0, and a getting started guide to help you create a simple Hello World application in minutes. The code from this tutorial still works great, but we recommend checking out our new SDK. We rebuilt the entire codebase and took advantage of new features from Apple, simplifying and streamlining the SDK.

** NOTE: Since we wrote this tutorial, we’ve released a new, completely-redesigned version of our iOS SDK (4.0).

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If you haven’t already, check out our first tutorial on how to retrieve and broadcast location coordinates with iOS. And if you’d rather use a different mapping SDK, we’ve got you covered! Check out our same tutorial using the GoogleMaps API or MapKit API.

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Using the Mapbox API to draw locations on a map in real timeĬlick to download the full source code for the entire project here.

Using PubNub to listen to a channel with Swift.

The app will retrieve and broadcast location data, then your subscriber receives the location data and streams changes to create a smooth and consistent iOS location tracking app. In this tutorial, we’re going to use the Mapbox API to receive and publish iOS location data on a live-updating map.

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