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(Note: Every buzz-and-nonbuzz word of this post was painstakingly conceived and typed by hand using a real-ass keyboard and a real-ass text editor running on my personal computer in my home office outside Cleveland, Ohio. No GPUs were harmed in the making of this film.)
I ran into some unexpected runtime crashes recently while testing an app on iOS 18 compiled under Swift 6 language mode, and the root causes ended up being the perils of using @unchecked Sendable in combination with some counterintuitive compiler behavior with implicit actor isolation. Rather than start at the end, I’ll walk you through how I introduced the crash, and then what I did to resolve…
I’ve found what I believe to be a bug, or at least deeply disappointing behavior, in Xcode’s treatment of SwiftUI previews. I’ll put an explanation together in the paragraphs that follow, but the TL;DR is: I think you’ll probably want to start wrapping all your SwiftUI Previews and Preview Content Swift source code in #if DEBUG active compilation condition checks.
I’m going to share some best practices when using @StateObject property wrappers, things learned the hard way, via some bugs that were difficult to diagnose and nearly impossible to notice during code review—unless one knows what to look for.
UIKit’s UIFontMetrics.scaledValue(for:) and SwiftUI’s @ScaledMetric property wrapper offer third-party developers a public means to scale arbitrary design reference values up and down relative to dynamic type size changes. Please be aware, however, that scaled values are not scaled proportionally with the default point sizes of the related text style. They scale according to some other scaling…
It is with great pleasure that I share that the following two Internet classics have been brought back to life at their own blessed domain names, with TLS and everything, honest to God 21st century websites:
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Four years ago today I was in Cupertino for the eve of what was supposed to be a small day of personal achievement. I was part of a special project for the fruit company that I can’t discuss. The kickoff was in the morning, November 4th. I scarcely contained my giddy excitement.