MVVM & RAC

Talk given at CocoaHeads Berlin April 2014

Demo project: https://github.com/stigi/mvvm-example

Transcript

1. MVVM & RAC CocoaHeads BLN 2014/04
2. About Me! ! ! stigi " stigi # ullrich.is || nslog.de || .com $ ullrich@ .com
3. Model – View – ViewModel • But first…
4. Where we come from – MVC Controller Model View Notify Update Update User Action (according to Apple)
5. Reality • View controllers carry application logic! • And view controllers are part of the View! • shouldRotate, viewDidAppear, viewDidLayoutSubviews! • Views often know way to much about the model! • -[UITableViewCell configureWithObject:]! • -[PersonView initWithPerson:]
6. Model – View – ViewModel Model View | ViewController ViewModel Update Notify User Actions Notify
7. Benefits • ViewController holds no application logic! • ViewModel does not know views! • ViewModel can be reused and extended! • Easy UI changes! • ViewModel is testable! • Easy migration, can co-exist with M–V–C
8. What goes where Model View | ViewController ViewModel UIView, Nibs,! UIViewController,! DataSources ViewModel NSManagedObject,! API Controller,! … RAC RAC
9. Reactive Cocoa • FRP! • React to Change! • Declarative! • Works great with KVO
10. Examples • In Xcode! ! ! ! • https://github.com/stigi/mvvm-example
11. Take aways • You’re doing it wrong! • MVVM is Zen, give it a try! • MVVM & MVC can co-exists
12. Questions? • Yes, Please?
13. About Me! ! ! stigi " stigi # ullrich.is || nslog.de || .com $ ullrich@ .com