One of the new frameworks added with iOS 9 is the Core Spotlight framework which allows you to make your app’s contact searchable with the on-device index which works with the updated NSUserActivity API for storing app states.
Here’s a tutorial from Gabriel Theodropoulus demonstrating how to use the framework through the creation of a simple app using IMDB data, and then making that data searchable using Core Spotlight with a downloadable example project.
You can find the Core Spotlight tutorial on the AppCoda blog.
A nice guide on using the Core Spotlight framework.
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