SwiftUI Layout API Reference

Comprehensive API reference for SwiftUI adaptive layout tools. For decision guidance and anti-patterns, see the axiom-swiftui-layout skill.

Overview

This reference covers all SwiftUI layout APIs for building adaptive interfaces:

• ViewThatFits — Automatic variant selection (iOS 16+)
• AnyLayout — Type-erased animated layout switching (iOS 16+)
• Layout Protocol — Custom layout algorithms (iOS 16+)
• onGeometryChange — Efficient geometry reading (iOS 16+ backported)
• GeometryReader — Layout-phase geometry access (iOS 13+)
• Safe Area Padding — .safeAreaPadding() vs .padding() (iOS 17+)
• Size Classes — Trait-based adaptation
• iOS 26 Window APIs — Free-form windows, menu bar, resize anchors