Apple explicitly annotates many of its types as being @MainActor, including most UIKit types such as UIView and UIButton. However, for a while the Swift team da...

Fetching JSON from the network and using Codable to convert it into native Swift objects is probably the most common task for any Swift developer, usually followed by dis...

Swift provides four concrete nominal types for defining custom objects: actors, classes, structs, and enums. Each of these works a little differently from the others, but the first...

Swift’s actors are conceptually like classes that are safe to use in concurrent environments. This safety is made possible because Swift automatically ensures no two pieces of cod...

SwiftUI provides a task() modifier that starts a new task as soon as a view appears, and automatically cancels the task when the view disappears. This is sort of the equi...

Swift’s task groups are collections of tasks that work together to produce a single result. Each task inside the group must return the same kind of data, but if you use enum assoc...

Older Swift code uses completion handlers for notifying us when some work has completed, and sooner or later you’re going to have to use it from an async function –&nbs...

Swift Testing's parameterized tests allow us to send multiple values into a single test, and they'll be run in parallel for maximum performance. If you don't want this – if you wa...

Swift provides withCheckedContinuation() and withUnsafeContinuation() to let us create continuations that can’t throw errors, but if the API you’re using ...

Swift tries to ensure access to shared data is done safely, partly through types such as actors, and partly through a concept of sendability implemented through the ...