Fatbobman's Swift Weekly #064

Happy New Year 2025

Dec 30, 2024

Weekly Comment

Happy New Year 2025

Despite the unrest in the world, 2024 has been a fulfilling and wonderful year for me. Throughout the year, I wrote 47 articles and published 51 weekly newsletters, and I can feel my understanding of Swift and SwiftUI continuously deepening. What brings me the most joy is that my entire family has stayed healthy and well.

I wish everyone good health and happiness in 2025. I also look forward to seeing Swift and SwiftUI continue to flourish in the new year.

Happy New Year 2025! 🎉

Previous Issue｜Newsletter Archive

Originals

Why Certain View Modifiers in Swift 6 Cannot Use the @State Property

In Xcode 16, to improve SwiftUI’s performance under Swift 6 mode, Apple made several adjustments to the SwiftUI framework’s APIs to meet stricter concurrency checks. The most notable change is the comprehensive annotation of the View protocol with @MainActor. While these optimizations generally enhance the developer experience in Swift 6 mode, they also introduce some seemingly anomalous compile-time errors in specific scenarios. This article delves into why certain view modifiers cannot directly use @State properties and provides corresponding solutions.

This is my last article published in 2024. I will be taking a break and plan to resume publishing new articles after the Spring Festival, around mid-February 2025. During this period, the weekly newsletter will continue to be published as usual.

Recent Selections

Exploring TabView Advancements in SwiftUI

At WWDC 2024, TabView received a major upgrade, streamlining the development process and bringing unprecedented flexibility and expressiveness to iPadOS and macOS platforms. This update introduced several remarkable new features, including a simplified tab creation method, enhanced programmatic navigation capabilities, and the sidebarAdaptable style optimized specifically for iPadOS. To fully understand these groundbreaking changes, Gabriel Theodoropoulos has written two in-depth articles that comprehensively showcase the evolution and improvements of TabView.

Reading and Displaying Genmoji in Non-Rich Text Formatted Data Context

Genmoji, an innovative feature launched by Apple at WWDC 2024, cleverly combines "generative" and "emoji" technology, enabling users to easily create unique personalized emojis. Based on NSAdaptiveImageGlyph, the feature is naturally suited for rich-text environments. In this article, Antonella Giugliano explains how to use SwiftUI to render information extracted from NSAdaptiveImageGlyph, enabling the display of Genmoji in non-rich text environments. This method provides developers with a flexible solution for handling and displaying mixed-content text and images.

Crafting a Dissolve Effect in Metal and SwiftUI

Metal’s shader system provides developers with powerful tools for creating high-performance, visually stunning effects. In this article, Uladzislau Volchyk explores how to use Metal to implement a dissolve effect, with a focus on the fundamentals of the Metal rendering pipeline. The author uses several diagrams to explain the working principles in detail, while providing complete implementation code, covering key steps such as renderer configuration, writing vertex and fragment shaders, and building the rendering pipeline with enabled blending functionality.

Write Swift Like Apple

There are many different code conventions in the Swift programming language. In his years of development experience, Uwais Alqadri found that when working with projects combining UIKit and SwiftUI, the best practice is to follow Apple’s own Swift coding style. Through two articles, he summarizes some of the common practices in Apple’s Swift programming, focusing on sensible naming, concise type inference, and clear protocol design, which allows the code to remain elegant and simple while naturally fitting into Apple’s framework design philosophy.

MyTallies Widgets, AppIntents, Siri Shortcuts and WatchKit

In this tutorial series, Stewart Lynch uses a SwiftUI and SwiftData-based counter app, MyTallies, to demonstrate how to build cross-platform functionality within the Apple ecosystem. The tutorial provides a comprehensive guide to developing widgets, implementing AppIntents, integrating Siri Shortcuts, and building WatchKit applications for the Apple Watch, offering clear explanations of these core technologies.

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肘子的话

2025 新年快乐

在浏览器阅读中文版本

尽管世界局势并不平静，2024 对我而言却是一个充实美好的年份。这一年里，我写下了 47 篇文章，发布了 51 期周报，也能感受到自己对 Swift、SwiftUI 的理解在不断深入。而最令我欣慰的，是全家人都健康平安。

祝愿大家在 2025 年都能拥有健康的身体、愉悦的心情。也期待 Swift、SwiftUI 在新的一年里继续蓬勃发展。

2025 新年快乐！🎉

前一期内容｜全部周报列表

原创

为何 Swift 6 中某些视图修饰器无法使用 @State 属性

在 Xcode 16 中，为了改善 SwiftUI 在 Swift 6 模式下的表现，苹果对 SwiftUI 框架的 API 进行了多项调整，以满足更严格的并发检查要求。其中最显著的变化是将 View 协议全面标注为 @MainActor。这些优化虽然总体上改善了开发者在 Swift 6 模式下的编程体验，但也在某些特定场景中引发了一些看似反常的编译错误。本文将详细探讨为什么某些视图修饰器中无法直接使用 @State 属性值，并提供相应的解决方案。

本文是我在 2024 年发表的最后一篇文章。接下来，我将休息一段时间，计划于春节过后（ 2025 年 2 月中旬）恢复发布新文章。在此期间，周报仍将正常发布。

近期推荐

探索 SwiftUI 中 TabView 的进展 (Exploring TabView Advancements in SwiftUI)

在 WWDC 2024 上，TabView 迎来了重大升级，不仅简化了开发流程，更为 iPadOS 和 macOS 平台带来了前所未有的灵活性与表现力。此次更新带来了多项引人瞩目的新特性，包括更为简洁的标签页创建方式、增强的程序化导航能力，以及专为 iPadOS 优化的 sidebarAdaptable 样式等。为深入理解这些革新性的变化，Gabriel Theodoropoulos 撰写了两篇深度解析文章，全面展示了 TabView 的演进与提升。

在非富文本环境中解析与展示 Genmoji (Reading and Displaying Genmoji in Non-Rich Text Formatted Data Context)

Genmoji 作为苹果公司在 WWDC 2024 重磅推出的创新功能，巧妙地融合了"生成式"（Generative）和"表情符号"（Emoji）技术，让用户能够轻松创建独具特色的个性化表情。该功能基于 NSAdaptiveImageGlyph 实现，天然适配富文本环境。在本文中，Antonella Giugliano 介绍了如何利用 SwiftUI 来渲染从 NSAdaptiveImageGlyph 中提取的信息，从而在非富文本环境下展示 Genmoji。这一方法为开发者提供了一种灵活的解决方案，用于处理和展示图文混合内容。