iOS extension- sharing bubble vs sharing button?

Question

I have read the apple docs about app extensions- sharing

https://developer.apple.com/library/ios/documentation/General/Conceptual/ExtensibilityPG/ShareSheet.html

What they say is that when an host app has a sharing button , you can choose your app extension to share content .

But it seems that there is another sharing option that is not in the docs, and i cant figure out whats the different and how you enable this extension.

When you mark any text in ibooks ,or Safari , there is a little bubble opened with copy, past, select all, and share. there if you hit the share button, you prompt with apps extensions, and you can share that highlighted text with the extension .

So, questions are :

1. the highlighted text sharing- is it enabled in every app that lets you to highlight any text ?

2. How you enable this extension, and is it the same as the regular sharing extension? (where you have a button with a rect and an arrow). Developing an app with sharing extension would be relevant to both cases ?

thanks.

Answer 1

Well , it seems that the sharing extension is working with the "bubble" sharing button , but with the regular sharing button(a rect and an arrow) you get as an input -a link to the page, much as Pocket do .

So software speaking its the same, functionality is different.