.NET MAUI - Toggle fullscreen for MacCatalyst desktop app

MacCatalyst gives you broad cross-platform reach, but some desktop-native window behaviors still need explicit interop work.

Fast path

• Prereqs: A MAUI MacCatalyst app and comfort with platform interop
• Steps: Resolve Objective-C class handles, get shared application and key window, then call toggleFullScreen:
• Result: Fullscreen behavior aligned with the macOS green window control
• Next: Apply the same bridging pattern for other AppKit-only desktop features

What you’ll learn

• Why UIKit-first MacCatalyst apps don’t expose all AppKit window APIs directly
• How to use runtime selectors safely from C#
• Where this pattern fits in desktop-first MAUI experience tuning