Multi-tasking prevents apps from freezing. In most programming languages, achieving this is a bit tricky, but the NSOperationQueue class in iOS makes it easy! This tutorial will demonstrate how to use the NSOperationQueue class. An NSOperationQueue object is a queue that handles objects of the NSOperation class type. An NSOperation object, simply phrased, represents a single task, including both the

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Some time ago I had written a post about how to use UITableView cells and make them work as a drop-down list. Anyone who had read that post might understood that when working with UITableViews you can do things more than the usual and common ones, and you can go as far as your imagination and the technology let you go. Indeed, when knowing how to work with UITableViews in a more advanced level, then you can create more flexible apps that make your users happier.

For a long time I wanted to write about a specific topic that surely every programmer encounters in his/her programming life. A topic not that difficult, but an important one. That is, how to scroll a textfield to a visible area of the view when it’s obscured by the keyboard and how to put it back into its original position, after the keyboard vanishes.

The topic of this tutorial is about the AVFoundation framework, which is a powerful set of tools that let programmers to work with both audio and video related tasks. In here, I’ll make a small introduction on how to play audio files using the framework, which is the most common task for the majority of the developers.

Welcome to the second part of this tutorial! At the first part we talked about a couple of things on how to import contacts from the device’s Address Book and we developed a demo app to see everything in action. What we really did, was to let us tap on a contact’s name, return back to our app and then select specific pieces of information regarding the selected contact, which we displayed on a table view.