LinkPresentationForSharing.swift

import UIKit
import LinkPresentation

class ViewController: UIViewController {

    @IBOutlet weak var sharingButton: UIButton!
    
    private var metaData: LPLinkMetadata = LPLinkMetadata() {
        didSet {
            DispatchQueue.main.async {
                self.shareURLWithMetadata(metaData: self.metaData)
            }
        }
    }
    
    var isFetchMetadataDynamic = true
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
    }
    
    func shareURLWithMetadata(metaData: LPLinkMetadata) {
        let metadataItemSource = LinkPresentationItemSource(metaData: metaData)
        let activity = UIActivityViewController(activityItems: [metadataItemSource], applicationActivities: [])
        present(activity, animated: true)
    }

    @available(iOS 13.0, *)
    func fetchURLPreview(url: URL) {
        let metadataProvider = LPMetadataProvider()
        metadataProvider.startFetchingMetadata(for: url) { (metadata, error) in
            guard let data = metadata, error == nil else {
                return
            }
            self.metaData = data
        }
    }
    
    func getMetadataForSharingManually(title: String, url: URL, fileName: String, fileType: String) -> LPLinkMetadata {
        let linkMetaData = LPLinkMetadata()
        let path = Bundle.main.path(forResource: fileName, ofType: fileType)
        linkMetaData.iconProvider = NSItemProvider(contentsOf: URL(fileURLWithPath: path ?? ""))
        linkMetaData.originalURL = url
        linkMetaData.title = title
        return linkMetaData
    }
    
    @IBAction func onSharing(_ sender: UIButton) {
        let url = URL(string: "https://www.apple.com/airpods-pro/")!
        if isFetchMetadataDynamic {
            //Fetch meta data from URL
            fetchURLPreview(url: url)
        } else {
            //Add metadata manually
            self.metaData = getMetadataForSharingManually(title: "[Custom Title] Airpods Pro", url: url, fileName: "airpods_pro_custom", fileType: "jpg")
            shareURLWithMetadata(metaData: self.metaData)
        }
    }
}


class LinkPresentationItemSource: NSObject, UIActivityItemSource {
    var linkMetaData = LPLinkMetadata()
    
    //Prepare data to share
    func activityViewControllerLinkMetadata(_ activityViewController: UIActivityViewController) -> LPLinkMetadata? {
        return linkMetaData
    }
    
    //Placeholder for real data, we don't care in this example so just return a simple string
    func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
        return "Placeholder"
    }
    
    /// Return the data will be shared
    /// - Parameters:
    ///   - activityType: Ex: mail, message, airdrop, etc..
    func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? {
        return linkMetaData.originalURL
    }
    
    init(metaData: LPLinkMetadata) {
        self.linkMetaData = metaData
    }
}