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Creating a spaceship operator

In the full tutorial…

  • What is it?
  • Just like other languages
  • A Swifty approach
  • Challenges
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Creating a WaveView to draw smooth waveforms

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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.

Making your app accessible

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It is my firm belief that every iOS app should be usable to everyone, and putting in the work to make your app function well no matter who is using it says a lot about the kind of developer you are.

How to use phantom types in Swift

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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.

Creating a custom property wrapper using DynamicProperty

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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.

Making the most of optionals

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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.

Shadows and glows

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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.

Trees

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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.

User-friendly network access

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Ultimate Portfolio App: Introduction

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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.

Understanding generics – part 1

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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.

Using memoization to speed up slow functions

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Questions and answers, part 2

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Questions and answers, part 2

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.

Handling names correctly

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Handling names correctly

There are lots of UI mistakes we can make in programming, but unless our bugs actually get in the way of functionality most users don’t care that much. But there is one exception, and we’re going to look at it here: in this article I’ll show you how to handle names correctly – the most personal data of all.

Creating the Home view

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Creating the Home view

So far our home view has simply been a host for adding test data, but that changes now: we’re going to make the home view a summary of all their project progress, plus the most important items coming up next.

Testing development data

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Testing development data

In previous tests we relied upon our sample data creating 5 projects and 50 items, 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, and along the way discover and resolve some interesting quirks…

Making the most of optionals – part 2

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Making the most of optionals – part 2

I already introduced how the internals of optionals work, including how they use conditional conformance and how to avoid infinitely sized structs. In this video I’m going to go further as we look at how our knowledge of Optional can be translated to Result, why it’s so important that optionals are functors and monads, and more.

First steps in UI

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First steps in UI

Now that we have our basic data model configured and coded, we can put it to use by building a simple user interface to help make sure our data is in place and working correctly.

Customizing Toggle using ToggleStyle

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Customizing Toggle using ToggleStyle

Most of the time the built-in iOS controls are great, but sometimes you want something just a little different. In this article I’m going to walk you through how you can take complete control over the way toggle switches work in SwiftUI, providing custom rendering and interactions.

Testing the basics

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ULTIMATE PORTFOLIO APP

Testing the basics

At last it’s time to start writing tests for our project, which means a little bit of setup work backed by writing our first couple of tests – we’ll take this slow initially, but lay down a good foundation for future tests.

Storing your code somewhere safe

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Storing your code somewhere safe

At this point we have something very simple working, so now is a great time to stash your code away somewhere safe using source control. If you already know how to use Git then you’re welcome to skip this part.

 
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