Apple Watch & iMessage Integration in Flutter

Short summary

A detailed developer guide for integrating Apple Watch and iMessage extensions into a Flutter iOS app using WatchConnectivity and App Groups shared containers. Covers Xcode setup, build settings for watchOS targets, SwiftUI native watch UI, and iMessage data syncing via shared UserDefaults. Includes architecture diagrams, code samples, troubleshooting tips, and App Store publishing checklist.

• •Flutter cannot run its UI engine on Apple Watch or iMessage; bridges use WatchConnectivity and App Groups shared UserDefaults
• •Covers full Xcode configuration including App Groups, watchOS platform settings, and icon catalog requirements
• •Includes Dart service code for two-way watch communication and one-way iMessage data sync

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