Now it is possible with iOS9 and beyond.
Apple has released the CoreSpotlight SDK (WWDC2015), where you can integrate your app into the spotlight of iOS and search for content.
There are other possibilities for integrating various user actions with your application, as well as searching for things, even if your application is not installed on the device.
If your application is an application that processes pdf, for example, if a user searches for a pdf file on his device, the application may appear in the searchlight settings as an application that he can use to read a pdf file, even if your application is not installed on the user device .
Given your example, it is now possible that if you are looking for a message line in the spotlight, spotlight can open your application, and you can force the user to actually find the exact message inside your application.
Adding a link below: You can find details for implementation.
https://developer.apple.com/library/prerelease/ios/releasenotes/General/WhatsNewIniOS/Articles/iOS9.html#//apple_ref/doc/uid/TP40016198-SW3
-Tejas
Tejas hs
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