The error underlined in the editor and include it in the errors window. Fix all the errors for Hot Reload to start working again for the page.įull page mode: If you make a change that XAML Hot Reload can't reload, it will show Won't apply changes, even if made on other parts of the page. If there are any such errors on the page, Hot Reload These Hot Reload errors have an error code starting with "XHR" (for XAML Hot Reload). XAML errorsĬhanges only mode: If you make a change the Hot Reload XAML parser sees as invalid, it will show You'll need to restart the debug session when switching modes. Full page mode is still provided for apps that haven't yet been updated to Xamarin.Forms 5.0. It's fast, preserves UI state, and supports Live Visual Tree. The running app then reloads the page, recreating its controls - you'll see the UI refresh.Ĭhanges only mode is the future of Hot Reload and we recommend using it whenever possible. Only updating on document save can sometimes be useful if you make bigger XAML updates and don't wish them to be displayed until they are complete.įull page mode sends the full XAML file to the running app after you makes edits and save. This can be accomplished by checking the Apply XAML Hot Reload on document save checkbox (currently only available on Windows) in the Hot Reload IDE settings. However, you can change this behavior to update only on file save. Changes only mode also enables use of the Live Visual Tree.īy default, with changes only mode you don't need to save your file to see the changes - updates are applied immediately, as you type. It preserves UI state, since it doesn't recreate the UI for the full page, just updating changed properties on controls affected by edits. This is the same technology used for WPF and UWP Hot Reload. However, you can force use of full page mode for allĪpps in the Hot Reload IDE settings ( Tools > Options > Debugging > Hot Reload on Windows or Visual Studio > Preferences > Tools for Xamarin > XAML Hot Reload on Mac).Ĭhanges only mode parses the XAML to see exactly what changed when you make an edit, and sends just those changes to the running app. For older versions of Xamarin.Forms, full page mode is used. XAML Hot Reload can work in two different modes - the newer changes only mode and the older full page mode.įrom Visual Studio 16.9 and Visual Studio for Mac 8.9, the default behavior is for changes only mode to be used for all apps that use Xamarin.Forms 5.0 or newer. You can use the following flowchart to check your existing project's setup for use with XAML Hot Reload: To use XAML Hot Reload with a physical iOS device, you also have to check Enable the Mono interpreter (Visual Studio 16.4 and above) or add -interpreter to your Additional mtouch args (Visual Studio 16.3 and below). Then, in your Android and iOS build settings, check that the Linker is set to "Don't Link" or "Link None".
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