Add share note functionality

[pelumy]

Issues covered

#1272

Description

This PR adds a share functionality to the share note button option on the confirmation dialogue in the NoteOptionsButton file. The following changes were made:

• A showingShare state variable was already present, so set it to true when the share note button is pressed.
• The share sheet was already present, so updated the code block to include sending the note link to the Apple Share sheet.
• Adds an optional completion handler to the ActivityViewController to perform actions after the share activity is finished.
• Sets showingShare to false in this completion handler to dismiss the share sheet after the share activity is finished.

How to test

1. Build the app.
2. Go to the Feed tab.
3. Choose any note and select the 3 dots menu at the top right of the note, just beside the time.
4. Click the share note button option
5. Please confirm that Apple's share sheet comes up and you can share the note link anywhere.

Screenshots/Video

Screen.Recording.2024-09-09.at.4.09.45.PM.mov

[pelumy]

I'm curious as to why this note link directs the user to an njump website instead of the nos app 🤔

[joshuatbrown]

@pelumy I think the main reason is compatibility -- we don't know the people who receive the link have Nos installed, and since we're using TestFlight right now, it's a little challenging for some people to get it installed. The njump link will work for anyone.

[joshuatbrown]

This works perfectly! Weird but cool that we already had the showingShare property and sheet ready for you! Great work!

[joshuatbrown]

Thanks for the update! Perfect!