How to open the app from the background task in iOS?

Is it possible to open an app from a background task in iOS?

I want my app to run in the background, and I want it to reappear for whatever reason without user input. Is this possible?

In Android you can have a service that runs in the background, and at any time you can start an Activity, which starts the app for that activity.

I know this does not make for a good user experience. I still want to know whether it can be done.

Copyright Notice：Content Author:「gjrwebber」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/22213907/how-to-open-the-app-from-the-background-task-in-ios

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