How to add a blurred view ontop of a view?

Question

I have an NSTableView that gets reloaded. While new data is loading, I want to add a subview ontop of it with a spinner. I would like the view ontop to be semi-transparent and r

Answer 1

The basic technique would be to snap an image of your view, using something like the ‑bitmapImageRepForCachingDisplayInRect: method of NSView, processing that image to make it blurred (Core Image is your friend here) and then overlay your view with an NSImageView containing the blurred image.

This is fakery, of course, but that's what showmanship is about :-)