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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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
Instruments gives us a range of tools for finding performance problems, and in this article we’ll be looking at how the Time Profiler instrument can point out problems in seconds.
We already looked at how to fetch decodable data using Combine, and also how to fetch and merge multiple sources of data. In this article we’ll tackle something even more complex: creating chained network requests, where the information retrieved from one request must be used to create multiple other requests.
Although our project doesn’t do anything particularly performance intensive, having a great portfolio app means you should at least attempt to demonstrate you understand how performance tests work. In this chapter we’ll add just such a test to our project, to make sure our award counting work is fast.
Button view is actually capable of doing remarkable things if you take the time to customize it. In this video I’ll be walking you through the
ButtonStyle protocol, showing you how we can use it to make great-looking and reusable button effects.
Many coding problems are designed to perform the same operation on lots of data, and in fact they are so common Apple has a whole framework to make it better: Accelerate. In this video I’ll give you an introduction to Accelerate using practical examples so you can see just how easy it is.
ButtonStyle lets us focus on how our buttons look, but not how they work, which in many situations is valuable. In this article we’ll look at a more advanced protocol,
PrimitiveButtonStyle, and see how that gives us complete control over button functionality.
Although we mostly prefer JSON for data transfer, many major languages make it easy to parse and traverse XML documents. Swift does not, but that’s something we can fix in under a 100 lines of code by writing our own implementation of MiniDOM – Python’s lightweight implementation of the document object model.
Our project has three extensions that add functionality to Apple’s own code, and we need to treat these carefully – we don’t own them, so their behavior might change at any point in the future. So, in this article we’re going to write tests for the extensions we created, making sure they work correctly every time.
Now that item editing works well, we can add a screen to edit projects. But before we can even think about that we need to add a custom section header to let users select a project to edit.
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