Hi, I’m Ole. I’m a developer from Berlin and co-author of Advanced Swift. Here, I mainly write about Swift and app development on Apple platforms. More about me.

1. Experimenting with Live Activities

   Learnings from implementing my first iOS 16 Live Activity. More >

   August 3, 2022

2. How @MainActor works

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

   May 5, 2022

3. AttributedString’s Codable format and what it has to do with Unicode

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

   April 27, 2022

4. A heterogeneous dictionary with strong types in Swift

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

   April 19, 2022

5. Advanced Swift, fifth edition

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

   March 28, 2022