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Phantom types are a powerful way to give the Swift compiler extra information about our code so that it can stop us from making mistakes. In this article I’m going to explain how they work and why you’d want them, as well as providing lots of hands-on examples you can try.
Getting ready for a job interview is tough work, so I’ve prepared a whole bunch of common questions and answers to help give you a jump start. But before you get into them, let me explain the plan in more detail…
Before you dive in to the first article in this course, I want to give you a brief overview of our goals, how the content is structured, as well as a rough idea of what you can expect to find.
Swift’s optionals are implemented as simple enums, with just a little compiler magic sprinkled around as syntactic sugar. However, they do much more than people realize, and in this article I’m going to demonstrate some of their power features that can really help you write better code – and blow your mind along the way.
UPDATED: While I’m sure you’re keen to get started programming immediately, please give me a few minutes to outline the goals of this course and explain why it’s different from other courses I’ve written.
Assertions allow us to have Swift silently check the state of our program at runtime, but if you want to get them right you need to understand some intricacies. In this article I’ll walk you through the five ways we can make assertions in Swift, and provide clear advice on which to use and when.
Generics are one of the most powerful features of Swift, allowing us to write code once and reuse it in many ways. In this article we’ll explore how they work, why adding constraints actually helps us write more code, and how generics help solve one of the biggest problems in Swift.
It’s not hard to make a basic property wrapper, but if you want one that automatically updates the body
property like @State
you need to do some extra work. In this article I’ll show you exactly how it’s done, as we build a property wrapper capable of reading and writing documents from our app’s container.
In this article I’m going to walk you through building a WaveView
with SwiftUI, allowing us to create beautiful waveform-like effects to bring your user interface to life.
Anyone can write Swift code to fetch network data, but much harder is knowing how to write code to do it respectfully. In this article we’ll look at building a considerate network stack, taking into account the user’s connection, preferences, and more.
In this article we’re going to look at the map()
function, which transforms one thing into another thing. Along the way we’ll also be exploring some core concepts of functional programming, so if you read no other articles in this course at least read this one!
SwiftUI gives us a modifier to make simple shadows, but if you want something more advanced such as inner shadows or glows, you need to do extra work. In this article I’ll show you how to get both those effects and more in a customizable, flexible way.
In this article you’ll learn how memoization can dramatically boost the performance of slow functions, and how easy Swift makes it thanks to its generics and closures.
Trees are an extraordinarily simple, extraordinarily useful data type, and in this article we’ll make a complete tree data type using Swift in just a few minutes. But rather than just stop there, we’re going to do something quite beautiful that I hope will blow your mind while teaching you something useful.
UPDATED: Now that we’ve got a basic draft of our sidebar working, we can proceed to the next level of our user interface: the content view, showing a list of all the issues they selected, then making sure user changes are synchronized across devices.
I’ve had a whole bunch more questions sent in from readers, covering Core Data, property wrappers, localization, and more, so let’s dive into them with some code examples.
This challenge asks you to make decorative decorations, make the rows in iExpense read more smoothly with VoiceOver, then conduct your own review of Moonshot and fix it up. Let’s tackle it now…
In this article we’re going to build a command line utility using Apple’s excellent Argument Parser library. The app we’ll build sorts lists of data in various ways – it’s a nice and simple project that allows us to focus firmly on Argument Parser.
UPDATED: In previous tests we relied upon our sample data creating 5 tags and 50 issues, but that isn’t set in stone right now – it’s an implementation detail, meaning that it’s a behavior that happens to be the case but isn’t explicitly guaranteed. This is a common cause of bugs, so in this article we’re going to write tests for our development code!
iOS 15 introduced a great many customization points to give us more control over list rows, text rendering, keyboard focus, and more, and these are all covered here.
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