Getting the tools to run the sample application is simple in OS X. The easiest way to install Xcode is through the App Store. In the top right-hand bar, search for the term Xcode, and from the list of results navigate to the Xcode store page, as shown in the following screenshot:
You also require the command-line tools (CLT) for Xcode. A prompt will display when they need to be installed. You can also download the command-line tools directly from the Downloads for Apple developers at https://developer.apple.com/downloads/.