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iOS Saigon #2: Auto Layout Workshop

What we will build:

In this exercise we will build an app that display popular GitHub repositories by language. We will practice using Auto Layout with table views.

What is Auto Layout?

Until the introduction of iPad and iPhone 5, all screens in the iOS world had the same point dimensions of 320x480 width x height. At this point in time it was often possible to describe an app's layout by specifying the absolute position and size of views.

Auto Layoutprovides a convenient way for you to describe how the size and position of your views should change when the size and position their parent views or neighboring views change.

  • Run on different devices
  • Size or number of neighboring views change due to the change in content
  • Rotating the device

Before you start:

Let's walk through the steps together. You can skip to a specific milestone by typing git checkout milestoneN. If you have changes before switching, make sure to commit or stash your changes first.

Milestone 1: Setup

  1. Clone the project from Github:
git clone https://github.com/coderschool/ios-autolayout-workshop
  1. Open the GithubDemo.xcworkspace file and run the app.
  2. You should see a list of GitHub repositories and their details printed in the console: Imgur

Note: The unauthenticated Github search API is rate-limited at 10 requests per minute. If you run into rate-limiting issues, you can register an app and put your clientId and clientSecret in the GithubRepo class.

Milestone 2: Augment the GithubRepo Model to include the Repo Description

  1. Add a repoDescription field to the GithubRepo model to represent a repository's description.

  2. Set the repoDescription field for each repository based on the data from the call to the Github Search API.

  3. Verify that you parsed the description correctly by adding it to the GithubRepo's description method:

    Imgur

Milestone 3a: Create the Main Repo Table View

GitHub|250

  1. In the doSearch() method of RepoResultsViewController, in addition to printing out the newRepos, store the returned repos in a property (var repos: [GithubRepo]!).
  2. Add a table view to the main RepoResultsViewController to display your search results.
  • The rows in your table should be automatically resizing based on the contents of each cell.
  • Make sure to call reloadData on your tableView after the network request comes back - i.e. in the successCallback of fetchRepos(...).

Milestone 3b: Design the Repo Row

Design a custom cell to contain all the information associated with a repository.

  • The cell should display the name, owner, stars, forks, and description as well as the owner's avatar.
    • Icons for "fork" and "star" are included in the starter project.
    • AFNetworking+UIImageView has already been integrated into the starter project. You should use this to display the avatar image.
  • The cell's contents should be laid out using Auto Layout.
  • The repository name and description labels should wrap if the text does not fit on one line:
    • You can make a label multiline by setting the lines count to 0 in the inspector.
    • To get the text to wrap properly for multiline labels with dynamic content you'll need to set the preferredMaxLayoutWidth. Fortunately, for apps targeting iOS8+, there is a simple setting in Interface Builder on the Label to do this automatically for you. Make sure that Preferred Width is set to Automatic: Imgur
    • If you have a multiline label adjacent to single-line labels you may need to adjust the compression resistance of your single-line labels in order to force the multiline label to wrap properly.

Bonus

You can do the following tasks at home if interested. Email me at [email protected] if you have questions.

The final results should look like this:

Bonus 4: Allow Filtering by Number of Stars

Github|250

  1. Add a settings button to the left of the search bar.
  • For buttons in the navigation bar, you should use a BarButtonItem in Interface Builder.
  1. Tapping on the settings button should modally present a settings view controller.
  • You can quickly add a navigation bar to your settings view controller by embedding it inside a navigation controller via the Editor -> Embed In -> Navigation Controller menu option. Method 2: just add a navigation bar directly to the view (instead of using a navigation controller).
    • Double click on the navigation bar to set your view controller title.
  • You'll need a way to pass the settings information between the main view controller and your settings view controller. If you're using storyboards this can be done in prepareForSegue and by setting up an unwind segue, as in this guide. Note:
    • You can also use the delegate pattern (with a little more code).
    • Make sure your unwind segue method is in the same view controller with prepareForSegue (and make sure it has the correct function argument).

  1. The settings view controller should have a single setting for the minimum number of stars a repo needs to have.

    • This should be represented by a slider.

  2. There is a save button for settings. When the save button is tapped the settings are saved and applied to the search immediately.

  3. There is a cancel button. Tapping on the cancel button returns to the main search results and discards any changes to the settings so that they are not reflected once the settings screen is opened the next time.

  • In order to discard any changes when the cancel button is tapped, you'll have to store a copy of the settings information in the settings view controller.
  • In Swift a quick way to make it easy to copy basic data objects (including arrays and maps) is by embedding them inside a struct. For example, changing the GithubRepoSearchSettings class to a struct makes it so that any assignment (via the = operator) creates a copy instead of a pointer to the object.

Bonus 5: Allow Filtering by Language

  1. The settings view controller should use a table view to display all settings.
  2. There should be a setting for whether to filter by language. This setting is controlled by a toggle switch.
  3. When the language filter toggle is on, a list of languages should appear in the table.
  4. Tapping on a language toggles whether it will be included in the search.

More Bonus Features

If you managed to finish all the milestones here are few things you can try:

  • Add options for whether the search should match text in a repo's name, description, and/or README.
  • Add options for sorting search results based on stars, forks, or relevance
  • Add options for searching only repositories created after a certain date (e.g. within the past week, month, year).
  • All languages available on github are defined here. Design and implement an interface for filtering based on that list of languages.