ReactorUI works with latest version of Xamarin Forms. I've tested it on Windows 10 with latest bit of Visual Studio 2019 (Community version is fine) and under macOS Catalina with latest Visual Studio for Mac 2019 .
Required installs
You just need to install the main nuget package of ReactorUI only for the Xamarin.Forms project.
NOTE: If you install from the Nuget Package Manager GUI check "Include prerelease" as ReactorUI is still in preview.
You'll also need an extension for Visual Studio 2019 created to streamline the hot reload process.
Download and install it from Visual Studio market place:
Please download the .mpack file and install it using the Extensions menu in Visual Studio:
Visual Studio->Extensions->Install from file..->select the .mpack file
Extensions menu under Visual Studio for Mac
Install the extension from file
NOTE: Microsoft may be working to enhance the extensions installing experience for Visual Studio for Mac but for now you have to install or update the extension manually as new versions are published.
To hit the hot reload command press ⌘+F7 or select the menu item under build:
Hot reload command under build menu
NOTE: Sometime can happen than Visual Studio extension is unable to forward to the emulator/device the tcp port used by ReactorUI to hot reload the app. In case just run adb forward tcp:45820 tcp:45820 from the Adb Command Prompt.