Background Blur Effect

[JulesMoorhouse]

Instead of having a alpha change for the background, it would be great to have a blur effect instead.

I've tried replacing the background view, but this had no effect.

I wish I'd posted here at the time, as I would have been able to remember exactly what happened. But I can't remember having any errors or warnings, just that it ignored my replacement background view class.

Can you offer any guidance on this?

My issue is that I have buttons on my parent view and simply applying a darkening effect doesn't make the parent buttons look disabled. The style of my app doesn't suit the darkening effect either.