Once an API exists to check for a page-specific block (See T194585) iOS editor should be updated to use this API to determine if the current user is blocked from editing the page.
On desktop and mobile web, the notice reads "You are blocked from editing Wikipedia." (or project name) for sitewide blocks. For partial blocks the notice reads "You are blocked from editing this page." Please let us know if the system messages need to be modified for proper display on the app.