MVVM-C In Practice

Model View View Model has been around as an architecture pattern for quite a while now and is generally accepted as an improvement over plain MVC. However MVVM still does not solve the problem of who takes responsibility for navigation hence the C, Coordinators. The session will look at developing an MVVM-C based app with Swift and Protocols using a mix of example along with hints and tips all gained from using MVVM-C in a recent OS X and iOS application where much of the code was shared.

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1. MVVM-C In Practice Steve Scott (Scotty) @macdevnet
2. Listen Carefully!
3. • Code Sharing Between iOS and OSX apps • Good Test Coverage • Easy To Test • Flexible Goals
4. Model Controller View
5. Model ? Controller UIViewController View UIView
6. Model ? View Model ? View UIView Controller UIViewController
7. Model ? View Model ? View UIView Controller UIViewController Presentation User Input Business Logic Data C.R.U.D
8. Model ? View Model ? View UIView Controller UIViewController Business Logic Data C.R.U.D Coordinator Navigation / Flow Presentation User Input
13. Protocols
14. View UIView Controller UIViewController Views
15. View UIView Controller UIViewController View Model Views
19. View UIView Controller UIViewController View Model Views Immutable?
20. View UIView Controller UIViewController View Model Protocol Views Property Delegate
23. View Model View Models
24. • Get Data From a Model • Send Data To a Model • Provide a Data Interface For Views • Inform View of Data Changes • Business Logic • Communicate State to Coordinator View Model View Models
28. Model Models
29. • Handle Data Access • Handle Saving Data • Uses functions not properties • All functions return data in a completion handler • Always assume to be asynchronous Model Models
37. Coordinator Coordinators
38. • Handle App Navigation • Build the MVVM Stacks Coordinators Coordinators
51. Model ? View Model ? View UIView Controller UIViewController Business Logic Data C.R.U.D Coordinator Navigation / Flow Presentation User Input
52. Github: macdevnet/mvvmc-demo
53. Twitter: @macdevnet