I'm creating a messaging app and I would like to enable other apps to share text to my app via the share menu option.
How do I get my app listed in there?
This is the menu I would like to get listed in:
You can't automatically be added to the UIActivityViewController in other apps. The only things that appear on that "share menu" are a few predefined apps that Apple has added support for, as well as any other app specific activities an app decides to add.
You can setup your app to appear in a list of apps for opening a file but that is not the same as what you are asking for here.
In iOS 8, Apple has now enabled a way for you to add your application to a user's Share Sheet as one of many features of Extensibility, which aims to make your app available to the user even when closed.
You can read a lot more about share extensions here, or go straight to Apple's pre-release documentation to dive into the code.
Update: Above link of Apple documentation is not working, check here App Extension Programming Guide: Share
You can do this by adding a few entries into your apps info.plist.
Here's a post that should answer this for you. slashdot post
also here another link
来源：https://stackoverflow.com/questions/16107446/how-to-get-listed-in-the-share-menu