Binding Realm

Transcript

1. Binding Realm potatotips #31 @woxtu
2. View Realm View View View Binding
3. View Realm View View View Binding Modify Modify Modify Modify
4. Binding Realm potatotips #31 @woxtu
5. How?
6. Key-Value Observing
7. Realm objects are Key-Value Observing compliant
 for most properties. https://realm.io/docs/swift/latest/#key-value-observation
8. A Realm Object class Person: Object { dynamic var id = 0 dynamic var name = "" override static func primaryKey() -> String? { return "id" } }
9. Using good old KVO let person = Person() let options: NSKeyValueObservingOptions = [.Initial, .New] person.addObserver(self, forKeyPath: "name", options: options, context: nil) override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) { } }
10. Using Bond let person = Person() let bnd_name = Observable<String>(object: person, keyPath: "name") bnd_name.observe { name in } bnd_name.bindTo(label.bnd_text)
11. Data Bindings • Bond (Observable) • ReactiveKit (Stream) • RxSwift (Observable) • ReactiveCocoa (?)
12. View Realm View View View Binding Modify Modify Modify Modify
13. We did it!
14. Extend a Realm Object extension Person { class Bindable { let id: Int let bnd_name: Observable<String> init(person: Person) { self.id = person.id self.bnd_name = Observable(object: person, keyPath: "name") } } var bindable: Bindable { return Bindable(person: self) } }
15. Extend a Realm Object let viewModels = ObservableArray<Person.Bindable>(persons.map { $0.bindable }) viewModels.lift().bindTo(tableView) { indexPath, viewModels, tableView in let model = viewModels[indexPath.section][indexPath.row] let cell = tableView.dequeueReusableCellWithIdentifier("person", forIndexPath: indexPath) as! PersonTableViewCell model.bnd_name.bindTo(cell.nameLabel.bnd_text).disposeIn(cell.bnd_bag) return cell }
16. Realm Insert/Delete Insert/Delete Collection
 View Table
 View Insert/Delete
17. How?
18. Realm Collection Notifications
19. Realm Collection Notifications let viewModels = ObservableArray<Person.Bindable>([])
 
 realm.objects(Person) .addNotificationBlock { [weak self] (changes: RealmCollectionChange) in switch changes { case let .Initial(persons): self?.viewModels.extend(persons.map { $0.bindable }) case let .Update(persons, _, _, _): self?.viewModels.diffInPlace(persons.map { $0.bindable }) case let .Error(error): … }
20. TL; DR • Key-Value Observing • Realm Collection Notifications
21. Binding Realm potatotips #31 @woxtu