LinkPresentation SwiftUI

LinkPresentation.swift

import SwiftUI
import LinkPresentation

struct TutorialPost: UIViewRepresentable {
  typealias UIViewType = LPLinkView
  
  var url: URL
  
  func makeUIView(context: UIViewRepresentableContext<TutorialPost>) -> TutorialPost.UIViewType {
    return LPLinkView(url: url)
  }
  
  func updateUIView(_ uiView: TutorialPost.UIViewType, context: UIViewRepresentableContext<TutorialPost>) {
    
    if let cachedData = MetaCache.retrieve(urlString: url.absoluteString) {
      uiView.metadata = cachedData
      uiView.sizeToFit()
    } else {
      
      let provider = LPMetadataProvider()
      
      provider.startFetchingMetadata(for: url) { metadata, error in
        guard let metadata = metadata, error == nil else {
          return
        }
        
        MetaCache.cache(metadata: metadata)
        
        DispatchQueue.main.async {
          uiView.metadata = metadata
          uiView.sizeToFit()
          
        }
      }
    }
  }
  
}

struct ContentView: View {
  var links: [String] = [
    "https://www.raywenderlich.com/5429927-beginning-collection-views",
    "https://www.raywenderlich.com/6849561-layout-in-ios",
    "https://www.raywenderlich.com/5429279-programming-in-swift-functions-and-types",
    "https://www.raywenderlich.com/6484760-create-a-splash-screen-with-swiftui",
    "https://www.raywenderlich.com/6275408-create-a-drawing-app-with-pencilkit",
    "https://www.raywenderlich.com/6177504-continuous-integration",
    "https://www.raywenderlich.com/5429927-beginning-collection-views",
    "https://www.raywenderlich.com/6849561-layout-in-ios",
    "https://www.raywenderlich.com/5429279-programming-in-swift-functions-and-types",
    "https://www.raywenderlich.com/6484760-create-a-splash-screen-with-swiftui",
    "https://www.raywenderlich.com/6275408-create-a-drawing-app-with-pencilkit",
    "https://www.raywenderlich.com/6177504-continuous-integration",
  ]
  
  var body: some View {
// Issues with reusability
//    List {
//      ForEach(links, id: \.self) { link in
//        TutorialPost(url: URL(string: link)!)
//      }
//    }
    
    ScrollView {
      ForEach(links, id: \.self) { link in
        TutorialPost(url: URL(string: link)!)
      }
    }
  }
}

struct MetaCache {
  
  static func cache(metadata: LPLinkMetadata) {
    
    do {
      let data = try NSKeyedArchiver.archivedData(withRootObject: metadata, requiringSecureCoding: true)
      UserDefaults.standard.setValue(data, forKey: metadata.url!.absoluteString)
    }
    catch let error {
      print("Error when cachine: \(error.localizedDescription)")
    }
  }
  
  static func retrieve(urlString: String) -> LPLinkMetadata? {
    do {
      guard let data = UserDefaults.standard.object(forKey: urlString) as? Data,
        let metadata = try NSKeyedUnarchiver.unarchivedObject(ofClass: LPLinkMetadata.self, from: data) else { return nil }
      return metadata
    }
      
    catch let error {
      print("Error when cachine: \(error.localizedDescription)")
      return nil
    }
    
  }
}

Do you have any working example with UITableView ? raywenderlich article suggest to use stackview instead of tableview.