LinkPresentation

ViewController.swift

import Foundation
import UIKit
import LinkPresentation

class ViewController: UIViewController {
    
  let metadataProvider = LPMetadataProvider()
  let url = URL(string: "https://www.raywenderlich.com/6613761-sharing-in-android-10-getting-started")!
  
  var links: [String] = []
  var metadata: [LPLinkMetadata] = []
    
  @IBOutlet weak var linkView: UIView!
  @IBOutlet weak var tableView: UITableView!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    metadataProvider.startFetchingMetadata(for: url) { metadata, error in
      guard error == nil else {
        print("Error...")
        return
      }
      
      // TODO: Make use of fetched data
      
      self.metadata.append(metadata!)
      
      // Present LPLinkMetadata in a LPLinkView
      DispatchQueue.main.async {
        let newLinkView = LPLinkView(metadata: metadata!)
        newLinkView.translatesAutoresizingMaskIntoConstraints = false
        // Below line doesn't seem to have any effect, even though there's a set size to the linkView in the storyboard
        // newLinkView.sizeToFit()
        self.linkView.addSubview(newLinkView)
          
        // Doing this for testing purposes, so that we can ensure the metadata is 
        // all present by the time it hits the table view
        self.tableView.reloadData()
      }
    }
  }
  
}

extension ViewController: UITableViewDelegate, UITableViewDataSource {
  func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    currentMetadata = metadata[indexPath.row]
  }
  
  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 1
  }
  
  func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    // Adding this height actually adds another view on top of the cell that covers the link 
    // that you can see in the view inspector
    return 223
  }
  
  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "LinkCell", for: indexPath) 
    
    guard !metadata.isEmpty else { return UITableViewCell() }
    let view = LPLinkView(metadata: metadata[0])
    //view.translatesAutoresizingMaskIntoConstraints = false
    cell.contentView.addSubview(view)
    view.sizeToFit()
      
    // How it *should* work
//    let provider = LPMetadataProvider()
//    provider.startFetchingMetadata(for: url) { metadata, error in
//      let view = LPLinkView(metadata: metadata!)
//      cell.contentView.addSubview(view)
//      view.sizeToFit()
//    }
    
    return cell
  }
}