Networking in Swift: Building the Swift Client, Part 1

If you've been following along from the beginning of this tutorial series on networking in Swift, you're now running a local web server and have created a simple RESTful API in PHP that serves up the inventory for our hypothetical Super PHPlumbing Bros. project. In this segment of the series, we'll build the iOS Swift client to bring that content to our end user. In the present article, we'll start our Swift project from scratch and create a single view application using a table view controller that will serve as the primary interface to our inventory of plumbing tools and supplies.

In the Beginning . . . 
Download and install the latest version of Xcode, if you haven't already, and fire it up. From the Xcode menu bar (or the Welcome screen) select File->New->Project. A window will appear with various options to choose from. In the left hand panel, under iOS, choose 'Application'. And in the main panel select 'Single View Application'. Then go ahead and click 'Next' as shown below.

On the following window you will be asked to name your application. Name it what ever you like. Under the Language section select Swift from the drop down menu. Make sure that the build is for iPhone in the 'Devices' menu, and then click 'Next' again.

You'll then be prompted to choose a location to house your project and will be given the option to place the project under source control. If you know how to use git for source control, then by all means use it! Otherwise, uncheck the box if it is already checked and click 'Create' to start up the project.

Displaying the Available Services
In our Swift application, we want to present the user with all the available services that our supply shop has to offer. Our custom API provides an interface to our inventory of Plumbing Tools as well as our inventory of Copper Pipes and Fittings. To present these options to the end user we are going to use a table view. So let's jump in. In the navigator panel (the left panel) of Xcode, locate and select the file named Main.storyboard.

Once the main storyboard loads, scroll to the pre-loaded Single View Controller and select it. When properly selected its border will turn blue, as seen here:

As we are going to use a table view, we can safely discard this default view controller. Delete the single View Controller by pressing the delete key on your keyboard, while the controller is selected. In the Utilities Panel on the right side of the Xcode interface, locate the Object Library submenu. Select a Table View Controller, and drag and drop it inside the main storyboard. 

While the new controller is selected, point your mouse toward Xcode's menu bar and select: Editor->Embed In->Navigation Controller. This embeds our selected Table View Controller into, you guessed it, a Navigation Controller.



A Navigation Controller is a stack for managing the presentation order of our view controllers. Select the Table View situated inside the Table View Controller, and then select the Attributes Inspector from the Utilities Panel. Locate the 'Content' field and select 'Static Cells' from its drop down menu.


You should see three cells appear inside the Table View. We only need two such cells, as this is where the user will be presented with the option to browse either the Plumbing Tools inventory or the Copper Pipes and Fittings inventory. Delete the bottom cell by first selecting it, and then pressing the delete key on your keyboard. Now let's name our two primary interfaces. For each of the two remaining cells, select the cell, and then locate the 'Style' field in the Attributes Inspector panel. From the 'Style' drop down menu select 'Basic'.


Both table view cells should now display a label that reads 'Title'. Two clicks in rapid succession on a label will place it into edit mode. Modify the titles so that they read from top to bottom, 'Plumbing Tools' and 'Copper Pipes and Fittings', respectively.

In order for the application to run, we need to specify the initial view controller that we want to load when the application first boots up. In the main storyboard, select the Navigation Controller. Then, in the Attributes Inspector menu, locate the check box that reads, 'Is Initial View Controller' and select it as shown below:

In the top left corner of Xcode make sure that the active scheme is set, and click the play button to build and run the application. Once the iOS simulator starts up, your app should look like this:

This project can be found on GitHub.

Success! We've built the primary view that will be presented to the end user when they open our iOS application. In part two of this segment, we'll begin building our data models. You can find part two in the tutorial on building the Swift client at the link.

Index
Introduction
Introduction and Overview: From the Back End API to the End User Application

The Web API
Building a RESTful API in PHP, Part 1
Building a RESTful API in PHP, Part 2

The Swift Client App
Networking in Swift: Building the Swift Client, Part 1
Networking in Swift: Building the Swift Client, Part 2
Networking in Swift: Building the Swift Client, Part 3
Networking in Swift: Building the Swift Client, Part 4
Networking in Swift: Building the Swift Client, Part 5

This tutorial was authored by Stefan Agapie, a Senior iOS Software Engineer, and adapted for the present piece. 

1 comment:

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