If you’ve spent any time working across different programming languages, you’ve likely encountered two distinct design philosophies for object creation: When designing Swift APIs—whether for an app architecture or an open-source library—a common question arises: Should you write a make…() factory method or a convenience init? The short answer: Swift strongly prefers initializers. Let’s break Read more
Building a library is rarely a straight line. It’s a series of “What if?” moments followed by “Oh, that’s why…” realisations. When I set out to build Swift Streamable Actors, the goal was simple: make Actor state observable via AsyncStream without the boilerplate. But getting there required navigating the strict world of Read more
I’m thrilled to announce the official release of Swift Streamable Actors, a new Swift macro library that brings AsyncStream-based reactivity to your Swift Actors. If you’ve ever wished you could observe changes to an actor’s properties as easily as an @Observable object, this library is for you. The Inspiration: Manual Streamable Properties Before diving Read more
When you mark a class as @Observable you can no longer use didSet because the macro converts it to a computed property, e.g. a simple: When expanded becomes: As you can see test has become a computed property that is a wrapper around a private _test property, a bit like Read more
Reposted from: https://forums.swift.org/t/how-to-use-observation-to-actually-observe-changes-to-a-property/67591/18 I thought I’d share an example of how I am currently using it. I wanted to make an object that maintains a sorted order of the main model’s objects. I used withObservationTracking to update if either the sort order local to this object is changed or if the particular Read more
I needed to create an AsyncStream to monitor changes to an @Observable model class’s var and by using withCheckedContinuation and AsyncStream‘s unfolding init I came up with this: The challenge here is withObservationTracking only watches for a single change but we can wrap that in withCheckedContinuation which also is designed Read more
When I first used AsyncStream with merge from AsyncAlgorithms I struggled with merging different stream result types and had experimented with building a protocol that each stream’s result type enum implemented. That way all the streams used the same protocol type and could be merged. I realised today that I Read more
A new collapse delegate was added in Xcode 12 and iOS 14. Unfortunately the Master-Detail template was removed so there has never been a good example of how to use it to maintain the behavior of the previous template which was to show the master if no detail is showing. Read more
Discovered this strange error in Swift, when using the sample code from the proposal which is supposed to have been accepted and implemented
I needed to show an alert in an async context and this is how I achieved it: The idea to throw a cancellation exception was inspired by DDDevicePickerViewController which is the only built-in async UIViewController I’m aware of.