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UITableView updates example. See https://grokswift.com/uitableview-updates/
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| // | |
| // ViewController.swift | |
| // starWarsTableViewUpdates | |
| // | |
| // Created by Christina Moulton on 2015-10-17. | |
| // Copyright (c) 2015 Teak Mobile Inc. All rights reserved. | |
| // | |
| import UIKit | |
| class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { | |
| @IBOutlet weak var tableView: UITableView? | |
| var movies:Array<String>? = ["Star Wars", "The Empire Strikes Back", "A New Hope"] | |
| var tapCount = 0 | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| let addButton = UIBarButtonItem(title: "Add", style: .plain, target: self, action: #selector(buttonTapped)) | |
| self.navigationItem.rightBarButtonItem = addButton | |
| } | |
| func buttonTapped(sender: AnyObject) { | |
| tapCount += 1 | |
| if (tapCount == 1) | |
| { | |
| // Add the prequels if we're not showing them yet | |
| movies?.insert("The Phantom Menace", at: 0) | |
| movies?.insert("The Attack of the Clones", at: 1) | |
| movies?.insert("Revenge of the Sith", at: 2) | |
| // use a single call to update the tableview with 3 indexpaths | |
| self.tableView?.insertRows( | |
| at: [IndexPath(row: 0, section: 0), | |
| IndexPath(row: 1, section: 0), | |
| IndexPath(row: 2, section: 0)], | |
| with: .automatic) | |
| } | |
| else if (tapCount == 2) | |
| { | |
| // Add the sequels, even though they don't exist yet | |
| // use one call to delete and one call to add rows to the tableview | |
| // so we need to wrap them in beginUpdates()/endUpdates() | |
| if let count = movies?.count | |
| { | |
| self.tableView?.beginUpdates() | |
| // add sequels | |
| movies?.append("The Force Awakens") | |
| movies?.append("Episode 8") | |
| movies?.append("Episode 9") | |
| self.tableView?.insertRows( | |
| at: [IndexPath(row: count - 3, section: 0), | |
| IndexPath(row: count + 1 - 3, section: 0), | |
| IndexPath(row: count + 2 - 3, section: 0)], | |
| with: .automatic) | |
| // remove prequels | |
| movies?.remove(at: 0) | |
| movies?.remove(at: 0) | |
| movies?.remove(at: 0) | |
| self.tableView?.deleteRows( | |
| at: [IndexPath(row: 0, section: 0), | |
| IndexPath(row: 1, section: 0), | |
| IndexPath(row: 2, section: 0)], | |
| with: .automatic) | |
| self.tableView?.endUpdates() | |
| } | |
| } | |
| } | |
| // MARK: - TableView | |
| func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { | |
| return movies?.count ?? 0 | |
| } | |
| func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { | |
| let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath as IndexPath) as UITableViewCell | |
| if let movieTitle = movies?[indexPath.row] | |
| { | |
| cell.textLabel!.text = movieTitle | |
| } | |
| else | |
| { | |
| cell.textLabel!.text = "" | |
| } | |
| print("row: \(indexPath.row), title: \(cell.textLabel!.text!)") | |
| return cell | |
| } | |
| } |
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