SwiftUI Multiplatform Design Guide

Multiplatform SwiftUI architecture uses a unified state-driven design with a single semantic action model across all Apple platforms. Define your state once, then adapt UI layout and interactions per platform—touch for iOS/iPadOS, cursor for macOS, gaze for visionOS—while keeping business logic shared. This reduces code duplication and ensures consistent behavior.

WindowGroup creates standard windows for iOS, iPadOS, and macOS apps with document or app-level state binding. ImmersiveSpace is visionOS-specific and renders fully immersive 3D environments with spatial computing principles. Both types integrate into a unified scene lifecycle when architected with window-scoped state.

Window-scoped state isolates data to individual windows, allowing multiple instances to run independently. Bind state at the scene level using environment or state properties that propagate down the view hierarchy. This pattern supports macOS multi-window workflows and visionOS multiple immersive spaces within a cohesive architecture.

Yes, with platform-specific ergonomics overlays. A unified view hierarchy detects the active input modality—touch gestures, mouse tracking, or gaze tracking—and applies conditional modifiers. Liquid Glass aesthetics and layered UI patterns adapt automatically, maintaining visual consistency while respecting each platform's interaction model.

Enforce separation of concerns: keep state logic platform-agnostic, move scene and window management to a dedicated coordinator, and use view modifiers for platform-specific layout. A single semantic action model routes all user intent through the same reducer or command handler, then platform-specific UI adapts the response.

A unified multiplatform architecture must distinguish between standard windows and immersive spaces at the scene level, but both types share the same state and action patterns. Pass-through interactions are visionOS-specific view properties; they integrate naturally into a modular design that separates scene type from business logic.