Topic

SwiftUI

A collection of 14 issues

Verlet Integration for Fluid Spring Animations in Swift

In my previous post, In-Process Animations and Transitions with CADisplayLink, Done Right, I outlined some of the use cases for implementing custom animations, as well as how to use CADisplayLink to help you drive the animations you create. CADisplayLink tells us when to perform updates. However, in that post we

NSAttributedString and AttributedString Bridging Performance on macOS

With the introduction of the Swift-native AttributedString in iOS 15 and macOS 12, it’s become pretty common to convert between the existing NSAttributedString and the new type. Certain first-party frameworks, like SwiftUI and App Intents, require developers to use the new AttributedString. In existing apps, simply moving off of

DocumentGroup Breaks focusedSceneValue Propagation

I have already written about another gnarly bug around document-based apps in SwiftUI in a previous post. In that post, I found that on visionOS, any DocumentGroup scene would duplicate your view hierarchy, causing pretty funny looking visual overlaying glitches. It was most visible on visionOS due to the amount

Conditional SwiftUI View Modifiers are Evil

Custom modifiers in SwiftUI are a great way to reuse code. However, that should never lead to obfuscating semantics. And, unfortunately, most use cases for conditional modifiers do both of those things. Here's why.

Overuse and Misuse of Spacers in SwiftUI Code

When it comes to writing good user interface code, and code in general, it’s not exactly groundbreaking to claim that in any given situation, we should strive to use the right tool for the right job. When working with tools and frameworks that are designed to seem simple on

Closures in SwiftUI Environment are Killing Your App’s Performance

SwiftUI undoubtedly has a lot of impressive capabilities and features, but unfortunately transparency is not one of them. Many components are designed and built as black boxes, with developers left attempting to piece together the full picture using the sparse information gathered from the documentation, WWDC videos, and reverse engineering.

Document-based SwiftUI Apps on visionOS 2.4 are Unusable due to a Regression

TL;DR: As a result of a gnarly regression, every document-based SwiftUI app on visionOS 2.4 is duplicating views, rendering document-based app completely unusable on the platform. I was working on porting one of my side project apps from macOS to visionOS, and at some point wanted to test

Adding Subtitles macOS Menu Items using SwiftUI

At this point, AppKit developers with their finger on the pulse may be familiar with setting subtitles on NSMenuItem using the subtitle property, which has been available since macOS 14.4. In fact, I was the one who added it back when I worked at Apple. Achieving the same in

Mysterious Runtime Crashes in Swift 6 Language Mode

Swift 6 language mode promises compile-time stricter concurrency checking, aimed at preventing and eliminating data races, runtime memory corruption, as well as other common but hard to debug issues. While adopting the new language mode can be a bit of a challenge for larger or less modular projects, Swift 6

Implementing a Modern SwiftUI Circular Progress Bar & Control

When I first wrote PZCircularControl in 2019, SwiftUI was still in its early days. The framework has matured significantly since then, introducing new features that enable interactions that were previously only achievable by dropping down to the Kits. Recently, I revisited the codebase and decided that a complete refactor of