The first technology of indexing for app indexing is working with NSUserActivity. This class helps you to index items when users perform activities in your app, such as opening specific screens or interacting with app content. Using this activity class will help a user to find the information that they need in search results and will improve your app's ranking. NSUserActivity is not intended to index an app's arbitrary data; it only indexes the user's activities. If you want to index app-specific data, you will need to use Core Spotlight APIs and that's what we will do in the next section:
In the following demo, we will build a simple wallet app where a user can track their expenses by entering the item name and price. Once the user enters a new item in the wallet, we will create a user activity so that the system can index...
