I found the place in the compiler’s source code where it applies a special attribute to DispatchQueue.main.async closures. Plus, a rant about how Xcode presents Swift concurrency context to the programmer.

Ole Begemann: iOS Development

10.08.2023

Keyboard shortcuts for Export Unmodified Original in Photos for Mac – Ole Begemann

A shell script that assigns a keyboard shortcut to the Unmodified Originals menu command in Photos on the Mac.

Ole Begemann: iOS Development

10.08.2023

You should watch Double Fine Adventure – Ole Begemann

Double Fine Adventure is a 12.5-hour documentary about the development of the game Broken Age. I loved it.

Ole Begemann: iOS Development

10.08.2023

Pattern matching on error codes – Ole Begemann

Foundation overloads the pattern matching operator <code>~=</code> to enable matching against error codes in <code>catch</code> clauses.

Ole Begemann: iOS Development

10.08.2023

Swift Evolution proposals in Alfred – Ole Begemann

I fixed Karoy Lorentey’s swift-evolution workflow for Alfred.

Ole Begemann: iOS Development

24.03.2023

How the relative size modifier interacts with stack views – Ole Begemann

The relative sizing modifier interacts in an interesting way with stack views and other containers that distribute the available space among their children. Understanding why can teach us a lot about SwiftUI’s layout algorithm.

Ole Begemann: iOS Development

24.03.2023

Working with percentages in SwiftUI layout – Ole Begemann

A SwiftUI layout and view modifier for relative sizing. “Make this view 50 % of the width of its container”.

Ole Begemann: iOS Development

22.03.2023

Keyboard shortcuts for Export Unmodified Original in Photos for Mac – Ole Begemann

A shell script that assigns a keyboard shortcut to the Unmodified Originals menu command in Photos on the Mac.

Ole Begemann: iOS Development

09.03.2023

Swift Evolution proposals in Alfred – Ole Begemann

I fixed Karoy Lorentey’s swift-evolution workflow for Alfred.

Ole Begemann: iOS Development

27.02.2023

Pattern matching on error codes – Ole Begemann

Foundation overloads the pattern matching operator <code>~=</code> to enable matching against error codes in <code>catch</code> clauses.

Ole Begemann: iOS Development

31.01.2023

You should watch Double Fine Adventure – Ole Begemann

Double Fine Adventure is a 12.5-hour documentary about the development of the game Broken Age. I loved it.

Ole Begemann: iOS Development

16.12.2022

Understanding SwiftUI view lifecycles – Ole Begemann

I wrote an app for observing how various SwiftUI constructs and container views affect view lifecycles, including the lifetime of state.

Ole Begemann: iOS Development

29.11.2022

Where View.task gets its main-actor isolation from – Ole Begemann

If you call SwiftUI’s <code>task</code> modifier inside a view’s <code>body</code> property, the async operation will run on the main actor. However, this isn’t the case if you call <code>task</code> from a helper property or function that isn’t main-actor-annotated. Why?

Ole Begemann: iOS Development

29.11.2022

Experimenting with Live Activities – Ole Begemann

Learnings from implementing my first iOS 16 Live Activity.

Ole Begemann: iOS Development

29.11.2022

A heterogeneous dictionary with strong types in Swift – Ole Begemann

I wrote a dictionary type where each key defines the type of value it stores. The public API is fully type-safe.

Ole Begemann: iOS Development

29.11.2022

clipped() doesn’t affect hit testing – Ole Begemann

The <code>clipped()</code> modifier in SwiftUI doesn’t limit hit testing to the clipping region. The clipped view can still receive taps/clicks outside the visible area. Add <code>.contentShape(Rectangle())</code> to change this behavior.

Ole Begemann: iOS Development

29.11.2022

Thinking in SwiftUI – Ole Begemann

The second edition of <em>Thinking in SwiftUI</em> is out now. I had a small part in the creation of the book as a technical reviewer.

Ole Begemann: iOS Development

29.11.2022

Synchronous functions can support cancellation too – Ole Begemann

Synchronous functions can perform the same cancellation checks as async code. Adding cancellation support can improve response times when async code calls long-running non-async code.

Ole Begemann: iOS Development

29.11.2022

Swift needs a better language reference – Ole Begemann

Reference documentation should be searchable, linkable, and ideally integrated into IDEs. A badly structured book isn’t good enough.

Ole Begemann: iOS Development

29.11.2022

My favorite books 2020 – Ole Begemann

Mostly non-fiction books this year. Some in English, some in German.

Ole Begemann: iOS Development

29.11.2022

AttributedString’s Codable format and what it has to do with Unicode – Ole Begemann

Don’t store string indices or offsets if possible. They aren’t stable over time or across runtime environments.

Ole Begemann: iOS Development

29.11.2022

How Swift runs an async executable – Ole Begemann

Who creates the task for your async <code>main</code> method to run in, and how.

Ole Begemann: iOS Development

29.11.2022

What is structured concurrency? – Ole Begemann

Structured concurrency is a new term for most Swift developers. This is an attempt to decipher its meaning.

Ole Begemann: iOS Development

29.11.2022

Cancellation can come in many forms – Ole Begemann

By convention, functions should respond to cancellation by throwing a specfic error. But not all functions follow the convention.

Ole Begemann: iOS Development

29.11.2022

When .animation animates more (or less) than it’s supposed to – Ole Begemann

SwiftUI views and view modifiers can be divided into “rendering“ and “non-rendering” groups. The position of the `animation` modifier with respect to non-rendering modifiers is irrelevant for the question if a change gets animated or not.

Ole Begemann: iOS Development

29.11.2022

How @MainActor works – Ole Begemann

The main actor is a global actor that uses a custom executor that runs jobs on the main dispatch queue.

Ole Begemann: iOS Development

29.11.2022

Sanitizing GPX files for public sharing – Ole Begemann

How to use XmlStarlet to strip out unwanted or privacy-sensitive information from a GPX file before sharing it on the web.

Ole Begemann: iOS Development

29.11.2022

Xcode 14.0 generates wrong concurrency code for macOS targets – Ole Begemann

Mac apps built with Xcode 14.0 and 14.0.1 may contain concurrency bugs because the Swift 5.7 compiler can generate invalid code when targeting the macOS 12 SDK. If you distribute Mac apps, you should build them with Xcode 13.4.1 until Xcode 14.1 is released.

Ole Begemann: iOS Development

29.11.2022

Advanced Swift, fifth edition – Ole Begemann

The fifth edition of our book Advanced Swift, fully updated for Swift 5.6, is out now.

Ole Begemann: iOS Development

29.11.2022

as, as?, and as! – Ole Begemann

The <code>as</code> and <code>as?</code> operators in Swift are more different than their similar names suggest.

Ole Begemann: iOS Development

29.11.2022

Where is end-to-end encryption for iCloud? – Ole Begemann

Despite Apple’s bold privacy claims, a large portion of your data stored in iCloud is still not end-to-end encrypted.

Ole Begemann: iOS Development

29.11.2022

How OrderedSet works – Ole Begemann

I did not understand how <code>OrderedSet</code> in the new Swift Collections library uses a hash table of array indices for fast lookups, so I read the source code to find out.

home›Ole Begemann: iOS Development›Technology

Ole Begemann: iOS Development - Technology

Building with nightly Swift toolchains on macOS – Ole Begemann

How the Swift compiler knows that DispatchQueue.main implies @MainActor – Ole Begemann

Keyboard shortcuts for Export Unmodified Original in Photos for Mac – Ole Begemann

You should watch Double Fine Adventure – Ole Begemann

Pattern matching on error codes – Ole Begemann

Swift Evolution proposals in Alfred – Ole Begemann

How the relative size modifier interacts with stack views – Ole Begemann

Working with percentages in SwiftUI layout – Ole Begemann

Keyboard shortcuts for Export Unmodified Original in Photos for Mac – Ole Begemann

Swift Evolution proposals in Alfred – Ole Begemann

Pattern matching on error codes – Ole Begemann

You should watch Double Fine Adventure – Ole Begemann

Understanding SwiftUI view lifecycles – Ole Begemann

Where View.task gets its main-actor isolation from – Ole Begemann

Experimenting with Live Activities – Ole Begemann

A heterogeneous dictionary with strong types in Swift – Ole Begemann

clipped() doesn’t affect hit testing – Ole Begemann

Thinking in SwiftUI – Ole Begemann

Synchronous functions can support cancellation too – Ole Begemann

Swift needs a better language reference – Ole Begemann

My favorite books 2020 – Ole Begemann

AttributedString’s Codable format and what it has to do with Unicode – Ole Begemann

How Swift runs an async executable – Ole Begemann

What is structured concurrency? – Ole Begemann

Cancellation can come in many forms – Ole Begemann

When .animation animates more (or less) than it’s supposed to – Ole Begemann

How @MainActor works – Ole Begemann

Sanitizing GPX files for public sharing – Ole Begemann

Xcode 14.0 generates wrong concurrency code for macOS targets – Ole Begemann

Advanced Swift, fifth edition – Ole Begemann

as, as?, and as! – Ole Begemann

Where is end-to-end encryption for iCloud? – Ole Begemann

How OrderedSet works – Ole Begemann

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