title: Downloading multiple files in batches in iOS
body: <p>I have an app that right now needs to download hundreds of small PDF's based on the users selection. The problem I am running into is that it is taking a significant amount of time because every time it has to open a new connection. I know that I could use GCD to do an async download, but how would I go about doing this in batches of like 10 files or so. Is there a framework that already does this, or is this something I will have to build my self?</p>