iOS and macOS got a new framework in WWDC’19 named LinkPresentation. LinkPresentation enables fetching URL previews.
Adding LPLinkView for presenting preview
LPLinkView is a view subclass meant for rendering LPLinkMetadata. LPLinkMetadata contains information about the link: title, icon, image, video.
Fetching previews with LPMetadataProvider
Instances of LPLinkMetadata are fetched using LPLinkMetadataProvider for a given url. LPLinkMetadata is conforming to NSSecureCoding what enables a way of converting it to Data and storing the metadata on disk. Next time we need metadata for this url, we can use a locally cached data instead. Archiving and unarchiving is done with help of NSKeyedArchiver and NSKeyedUnarchiver and in the example archived data is stored in UserDefaults. In real apps it makes sense to store the data in separate files instead and not polluting UserDefaults with preview data.
LinkPresentation framework adds a easy way of fetching previews for web pages. It provides a LPLinkView class making it extremely easy to render the preview.
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LinkPresentationView (Xcode 11 GM)