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trySwift
import UIKit
// If you enjoyed this talk (video link will be up soon), then you might also enjoy our book Advanced Swift: http://www.objc.io/books/advanced-swift
struct Person {
let name: String
let city: String
}
let people = [
Person(name: "Chris", city: "Berlin"),
Person(name: "Natasha", city: "Tokyo"),
Person(name: "Ayaka", city: "San Francisco"),
Person(name: "Ash", city: "New York")
]
let pokedex = ["Pikachu", "Snorlax", "Delphox"]
struct UndoHistory<Item> {
let initialValue: [Item]
var history: [[Item]] = []
init(_ initialValue: [Item]) {
self.initialValue = initialValue
}
var currentValue: [Item] {
get { return history.last ?? initialValue }
set { history.append(newValue) }
}
var canUndo: Bool {
return !history.isEmpty
}
mutating func undo() {
history.popLast()
}
}
struct TableViewConfiguration<Item> {
var items: [Item]
var style: UITableViewStyle
var cellStyle: UITableViewCellStyle
var editable: Bool
var configureCell: (UITableViewCell, Item) -> ()
}
final class MyTableViewController<Item>: UITableViewController {
var history: UndoHistory<Item> {
didSet {
tableView.reloadData()
navigationItem.rightBarButtonItem = history.canUndo ? UIBarButtonItem(barButtonSystemItem: .Undo
, target: self, action: "undo:") : nil
}
}
var items: [Item] {
get { return history.currentValue }
set { history.currentValue = newValue }
}
let cellStyle: UITableViewCellStyle
let configureCell: (cell: UITableViewCell, item: Item) -> ()
init(configuration: TableViewConfiguration<Item>) {
self.history = UndoHistory(configuration.items)
self.cellStyle = configuration.cellStyle
self.configureCell = configuration.configureCell
super.init(style: configuration.style)
if configuration.editable {
navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Edit, target: self, action: "edit:")
}
}
func edit(sender: AnyObject) {
self.tableView.editing = !self.tableView.editing
}
func undo(sender: AnyObject) {
history.undo()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: cellStyle, reuseIdentifier: nil)
let item = items[indexPath.row]
configureCell(cell: cell, item: item)
return cell
}
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
guard editingStyle == .Delete else { return }
items.removeAtIndex(indexPath.row)
}
}
let config = TableViewConfiguration(items: people, style: .Plain, cellStyle: .Subtitle, editable: true) { cell, item in
cell.textLabel?.text = item.name
cell.detailTextLabel?.text = item.city
}
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
var myConfig = config
myConfig.style = .Grouped
let tableVC = MyTableViewController(configuration: myConfig)
let navigationController = UINavigationController(rootViewController: tableVC)
window = UIWindow(frame: UIScreen.mainScreen().bounds)
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
return true
}
}
@donnie-s

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@donnie-s donnie-s commented Aug 15, 2016

Interesting talk Chris, thanks!
The link for this gist is not on https://realm.io/news/tryswift-chris-eidhof-table-view-controllers-swift/ and it took a bit of digging to find this.

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