How to disable the whole view while fetching a request?

I am working with a iPhone application in which I am displaying images in a scroll view.

The "Gallery" feature is working nicely but In an exceptional condition I want the view locked untill I get the images loaded .

So the question is how can I disable the view and show it slightly blurred while I am fetching the images .

Thanks

Matt Gallagher has a great reusable Loading View example on his site under a very generous, open license.

If it's not exactly what you want, it's probably pretty close. He documents it well, and talks about the design very nicely in the post.