Field notes on building apps for Apple platforms — SwiftUI, UIKit and the occasional deep dive.https://giraffeee.dev/https://giraffeee.dev/blog/iphone-duo-field-guide/https://giraffeee.dev/blog/iphone-duo-field-guide/What actually changes when your iPhone app runs on a foldable: size classes, vertical bars, split views, sheets, and the new Duo-only APIs, with diagrams, simulator screenshots and code you can paste.Tue, 10 Nov 2026 00:00:00 GMT