Several treasures like not so well-known frameworks and libraries can be found in the iOS SDK. Most of them can be proved to be real gems and truly useful tools, saving you from hours of extra work. One of them is the Quick Look Framework, and even if you’ve never used it before, it’s easy to understand what’s all about just from its name; it provides previewing capabilities for documents that an app handles. Like most people, I wasn’t aware of it until I had to use it for first time; then I appreciated its existence.
For the full tutorial, you can check it out here: