Xu Yang iOS Articles & Videos

Unfortunately, within Apple’s persistence framework ecosystem, this experience is mainly reflected in SwiftData. The large and stable Core Data ecosystem, which still powers many complex applications, has not received the same level of native integration. To bring the convenience of modern Swift features to this long-standing persistence framework, I recently explored and implemented Observation support in Core Data Evolution(CDE), giving NSManagedObject property-level precise observation capabilities.

This article discusses the motivation behind this feature, how to use it, its implementation approach, the engineering challenges involved, and some of the trade-offs made during development.

The declarative expression of animation is one of SwiftUI’s core strengths. But in some scenarios the result isn’t always as smooth as we’d hope. A typical example: when the content height inside a List row changes dynamically — a subtitle going from empty to non-empty, or text changing its line count after an update — the system’s built-in layout engine often fails to produce a continuous transition. Instead we get visible height jumps, flicker, or even clipping anomalies. This article starts from that phenomenon, peels back the causes layer by layer, and gives a solution built entirely on SwiftUI’s native primitives. Along the way it revisits a few key constraints in SwiftUI’s layout machinery.