Proton for iOS
Purely native and extensible rich text editor for iOS and macOS
... to be used as a UITextView and in most complex form, it should be able to provide rich text editing capabilities which are beyond just text formatting. Should be extensible to support adding any view as content in the Editor such that it flows with the text. Resizing of content views should automatically resize the containing Editor and support this to nth nesting level. Should support extending the appearance of text as the content is typed.