Is there a way to determine when the user is about to quit the application while using Mac Catalyst? I'd like to alert the user when they have unsaved changes before they quit, but cannot seem to find how to do that using Mac Catalyst.

Is there a way to create a BGRA8Unorm texture that doesn't take up a lot of memory on the device (iOS and MacOS)? In my app the user can create a texture of any size, however the memory usage becomes too high even with relatively average sized textures (ex. 2048 by 2048). Is there a way to create large textures that don't take up a lot of memory?