Displaying "matchedMediaItem.artist" on the screen of iPhone

Custom Catalogs have their metadata defined by you in a form of a SHMediaItem. When you create a SHCustomCatalog with a SHSignature, you can attach a SHMediaItem objects as a metadata to represent a signature.

When the match happens then you should be able to get that SHMatchedMediaItem/SHMediaItem you defined at catalog creation. So in order to get the artist property, you will need to create an SHMediaItem with SHMediaItemArtist at catalog creation, something like this:

let signature = ...
let mediaItem = SHMediaItem(properties: [.artist: "Artist name"])

let customCatalog = SHCustomCatalog()
try customCatalog.addReferenceSignature(signature, representing: [mediaItem])

You can also download the Building a Custom Catalog sample app, where you can find an example of how a Custom Catalog is created and how metadata is defined. The CatalogProvider.swift file should contain most of the relevant parts.

Let us know if you run into any issues.