iOS 9 is the ninth version of Apple's iOS mobile operating system. It was announced at the company's Apple Worldwide Developers Conference (WWDC) on June 8, 2015.

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With the iPhone 6s and 6s Plus, Apple introduced an entirely new way of interacting with our devices called 3D Touch. 3D Touch works by detecting the amount of pressure that you are applying to your phone's screen in order to perform different actions. In this tutorial, I am going to show you how to take advantage of 3D Touch so that you can utilize this new technology in your own iOS 9 apps.

Every developer that has dealt with the AddressBook API in the past can definitely say that it wasn’t the most easy part of the iOS SDK to work with. In general, the AddressBook was difficult to understand and manage, and that fact was even more intense in new developers. All that belongs to history, as the new Contacts framework is way simpler to understand and use.