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Bite-sized screencasts on iOS and Mac development.

Displaying Episode 25 - 48 of 358 in total
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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.
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#318
318 setting up mac
In this episode we look at some of the basic system preferences on macOS High Sierra. We set up the Dock, Keyboard shortcuts, and show how to customize key repeat timing outside of the preferences window.
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#317
317 preheating images with nuke
The prefetch APIs for UITableView and UICollectionView are great for preemptively loading pages of data, as we saw in episode 315. However, to take full advantage of this API we should also leverage loading or processing data related to the cells we are about to show. One common example of this is fetching an image before the cell comes on screen. In this episode we will implement this with a handy library called Nuke. The result is quite impressive.
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#316
316 solid dip
In this episode we cover the dependency inversion principle, which states that high level components should not depend on low level components, but instead they both should depend on abstractions. We will look at two examples of this and leverage dependency injection to decouple classes from concrete dependencies.
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#315
315 uitableview prefetching
Extending our example from episode 309, here we implement automatic tableview paging support by utilizing the UITableViewDatasourcePrefetching protocol. With this protocol, our delegate is notified of upcoming rows the user is about to encounter, and gives us an opportunity to preemptively load data for those rows.
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#314
314 solid interface segregation
In this episode we examine ISP (the Interface Segregation Principle). This one states that a type should not depend on methods from an interface that it will never use. Often times this means that the type probably carries too many responsibilities, but breaking it apart is difficult for other reasons (perhaps too many things depend on it and changing it would be expensive). You can extract smaller interfaces that support the individual responsibilities, but still have the same class adopt it. Doing so opens up opportunities for further refactoring and testing.
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#313
313 solid lsp
In this episode we examine the Liskov Subtitution Principle, which stresses the importance of the strong relationship a type has with its super type. Understanding LSP can help you identify when you are missing an important abstraction, or perhaps when inheritance is being abused as a tool.
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#312
312 solid ocp
The Open Closed Principle (or OCP) states that a class should be open for extension, but closed for modification. The goal is to write classes that are more stable, and don't require constant changes themselves to support every scenario the software encounters. Instead, having a stable class to inherit from can provide a nice extension point for our software to customize it for other needs.
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#311
311 solid srp
In this episode we'll examine a type that has too many responsibilities and refactor it into multiple types, each with their own responsibility.