让一个应用程序出现在共享面板中，接受其他应用程序的选定文本。

I'm writing an app in iOS which handles text. Normally users can enter in their own text via a text area but I would also users like to be able to highlight text in other apps (e.g. mail, websites etc.) and allow users to send text via selection and the share panel where my app would then appear? Can I do this in iOS and if so how? Is this like the reverse of UIActivityViewController? I'm writing an app in iOS which handles text. N