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Video Training for iOS Developers

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Bite-sized screencasts on iOS and Mac development.

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327 testing ios apps intro
In this episode we will intercept and stub image requests to prevent our tests from making network calls when interacting with our view controller.
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#341
327 testing ios apps intro
When running your unit tests, you may have noticed that your application continues to launch in the simulator. In this episode we'll talk about why that can be problematic and what you can do to mitigate this issue from interfering with your tests.
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#340
327 testing ios apps intro
We continue testing our view controller, this time focusing on the UITableViewDataSource implementation. Testing the number of rows returned is easy, but we can also test that the controller returns the appropriate cell and that its outlets are configured properly.
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#339
327 testing ios apps intro
Testing view controllers can sometimes be challenging. In this episode we will write some tests that verify a view controller loads its data properly from the API client. We will add additional tests to verify that a loading indicator is shown.
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#338
327 testing ios apps intro
XCTAssertion functions are a foundational part of your test suite but sometimes can be too low-level. You want to know exactly why a test failed, not that "2 was not less than 1." By extracting helper methods to do assertions for you, you can give groups of assertions meaning, and make it easier to reason about your tests and why they might be failing.
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#337
327 testing ios apps intro
When refactoring tests, you end up moving critical assertion logic outside of the test method. This can cause our tests to fail in the wrong spot. This becomes worse if multiple methods share test logic. When a test fails you want to know exactly where the failure occurred. By leveraging #file and #line expression literals we can move the failure back to where it should be, within the test method. We will also see how we can continue to use expectations outside of a test instance.
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#336
327 testing ios apps intro
In this episode we look at Xcode's support for measuring Code Coverage, a term that describes how much of your code is exercised during a test run. Using this tool you can see where your deficiencies are and add tests as needed to cover more of your production code with tests.
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#335
327 testing ios apps intro
In this episode we implement OHHTTPStubs, a library that can be used to intercept and stub out network calls made with URLSession. Using this technique we can avoid hitting the network for our tests. We can also simulate different responses that are difficult or impractical to simulate in a real request.
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#334
327 testing ios apps intro
In this episode we talk about testing requests against a real API. For this we will build an app called CoinList that leverages the Crypto Compare API to fetch stats about crypto currencies.
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#333
327 testing ios apps intro
In this episode we cover the concept of expectations, which enables us to test asynchronous code, properly timing out and failing a test if the expectation is never fulfilled.
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#332
327 testing ios apps intro
In this episode we use mocks and stubs to setup collaborating objects to inspect the behaviors of tested objects.
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#331
327 testing ios apps intro
In this episode we go over examples of value based testing used for easily testable systems.
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#330
327 testing ios apps intro
Running your tests in Xcode Playgrounds can be a great way to get rapid feedback on your changes. It is a useful way of practicing testing and experimenting with APIs that you are not familiar with. In this episode we will see how to run the test suite and how to enhance the feedback we get by observing the test results as they are run.
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#329
327 testing ios apps intro
If you did not check the box "Include Unit Tests" when first creating your project (or perhaps you want to add a separate testing target), this screencast will show the steps of how to get it set up from scratch. It also covers how to set up a scheme dedicated to building your tests, and choosing which tests to run automatically.
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#328
327 testing ios apps intro
XCTest is a test framework built into Xcode. In this episode we'll see the mechanics of how this works, how your test bundle sits alongside your app in Xcode. We'll look at the structure of test cases, and the assertions we will use to verify behavior of our code.
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#327
327 testing ios apps intro
Introduction to the Testing iOS Applications series
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#326
326 swift 4 keypaths
Swift 4 key paths allow us to refer to properties of Swift types in a dynamic way, enabling us to program against them without knowing the exact property in question. In this episode we will see how they are created, how they are used, and see examples of them in action with Key-Value Observing and Autolayout.
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#325
325 new mac setup xcode
In this episode we setup our Xcode preferences and themes.
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#324
324 new mac setup ruby dev
In this episode we install homebrew, a popular package manager. We use it to install Macvim and ruby. We also setup Postgres with Postgresapp.
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#323
323 new mac setup git ssh
In this episode we configure git to identify our commits, set up a diffing & merging tool, and configure SSH so we can log into other machines securely.
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#322
322 new mac setup iterm keyboard
In this episode we configure iTerm’s keyboard behavior to match macOS to allow for quick jumping between words in the terminal.
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#321
321 new mac setup dotfiles
In this episode, we set up our dotfiles to customize aspects of bash, git, vim, and other terminal programs that are core to a good terminal experience.
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#320
320 fastlane boarding
Managing external beta users can be a bit of a chore, as you have to log into iTunes Connect and add them one by one (or a batch if you have them collected already). If you’re opening your beta to a wider audience, you can save a lot of time by automating it. In this episode we will use Fastlane Boarding to automate adding testers to Testflight.
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#319
319 new mac setup terminal
In this episode we will setup iTerm2, profiles, custom color schemes, and fonts.