As we said, an app extension is just a task that can be performed and accessed outside you app. For example, you can use an extension to display timely content in the Today view of the notification center.

An extension for the sports app displays the currently playing games and results. This data can be updated in real time and can really help users to reach their content in an easy and fast way and from any place—the system or other apps.

Another extension gives you the ability to add a custom keyboard that replaces the boring system keyboard. Users can choose which keyboard to activate choose the one that appeals to them, and make their writing experience easier. App extensions are introduced in iOS 8 and OS X 10.10, so some extensions exist in both iOS and OS X, some of them in iOS only, and some are in OS X only. Here, we will list all available app extensions that are available in iOS. All the upcoming extensions are easy to use, thanks to Xcode, as it provides you with...