Downloaded 10 times
![ONE DIRECTION EVENT FLOW
Source Destination
(void)[source callMethod]
14](https://image.slidesharecdn.com/mvvmractdd-150406081104-conversion-gate01/75/How-to-RAC-TDD-MVVM-14-2048.jpg)
![NO SIDE EFFECTS
Source Destination
(void)[source callMethod]
Return values
Call methods
15](https://image.slidesharecdn.com/mvvmractdd-150406081104-conversion-gate01/75/How-to-RAC-TDD-MVVM-15-2048.jpg)
Uploaded byFwdays
Алексей Демедецкий: How to: RAC, TDD, MVVM
This document provides an overview and agenda for using MVVM, ReactiveCocoa (RAC), and test-driven development (TDD) approaches for iOS development. It discusses moving from massive view controllers to the MVVM pattern with RAC to separate concerns and manage data flow and binding. It also addresses using TDD for the view layer and unit testing view models and models. Key aspects covered include decomposition, connections between layers, and proper use of RAC as a binding mechanism rather than for application logic.
More Related Content
Similar to Алексей Демедецкий: How to: RAC, TDD, MVVM
Алексей Демедецкий: How to: RAC, TDD, MVVM
- 1. HOWTO: MVVM + RAC+TDD Note: All info is subject to change. April 2015 1
- 2. ABOUT Alexey Demedeckiy iOS developerat Ciklum CSC CI Mentor 2
- 3. BACKGROUND B2B projects. Rich dataflow. Rich UI. Animation driven UI. 3
- 4. AGENDA Road to MVVM MVVMState of the union TDD on UI? RAC? Outro 4
- 5.
- 6.
- 7.
- 8.
- 9. MVVM (RICHVIEW) +RAC UIViewController UIKit Network Data storage Business logic Custom interface System Interaction @interface MyView: UIView id<MyViewModel> 9
- 10. MVVM (RICHVIEW) +RAC UIViewController UIKit Network Data storage Business logic Custom interface System Interaction @interface MyView: UIView id<MyViewModel> 10
- 11.
- 12. ONE DIRECTION STATEFLOW Source Destination Data as @properties 12
- 13. NO HIDDEN CONNECTIONS SourceDestination Data as @properties Call methods Set values 13
- 14. ONE DIRECTION EVENTFLOW Source Destination (void)[source callMethod] 14
- 15. NO SIDE EFFECTS SourceDestination (void)[source callMethod] Return values Call methods 15
- 16. HOWTO ACHIEVE? Destination ownsa Source. Destination calls a Source. Destination look at Source state. Destination is derived from Source. 16
- 17.
- 18. MVVM View Model ViewModel UIKit state flow event andownership flow 18
- 19. AT SCALE No singletons. Contextderived object graph. Lifecycle is determined by (UI + BL) 19
- 20. MVVM AT SCALE View Model ViewModel UIKitApp component Creation 20
- 21. DECOMPOSITION IS AKEY View decomposed to UIViews, UIViewControllers, DataSources, Delegates, Managers, Storyboards… View Model decomposed toView Models. Model decomposed to Core, Services, Facades. 21
- 22. CODE / LAYERDISTRIBUTION 0 25 50 75 100 Content feed Content editor Offline content Offline with sync View ViewModel Model 22
- 23. VIEW LAYER Storyboard backed,XIB backed, code - no matter. Layout. Localization. Render efficiency. 23
- 24. VIEW LAYER CONNECTIONS View ViewModel Data display View View Model Alternate layout View View Model Tab like interface View View Model View Model 24
- 25.
- 26.
- 27. TDD INVIEW: SETUP ARCSafe creation Window for events 27
- 28.
- 29. TDD INVIEW: DEALLOC Expectdealloc RAC Dealloc hook Check deallocARC safe nil 29
- 30. TDD INVIEW: RELOADDATA 30
- 31. TDD INVIEW: RELOADDATA Flag HOOK on SUT method CheckSet flag 31
- 32. TDD INVIEW: CELLTAP Loadmock data to table view 32
- 33. TDD INVIEW: CELLTAP Setupexpectation for correct call 33
- 34. TDD INVIEW: CELLTAP Setupexpectation for correct call Verify call correctness Fire expectation Is Equal to string wrapper 34
- 35. TDD INVIEW: CELLTAP Sendevent to cell 35
- 36. TDD INVIEW: CELLTAP Sendevent to cell Push segue require NavConWait for UIKit internalsSend event Verify 36
- 37. TDD INVIEW: P.S KIFfor interacting. We need to wait. Sometimes. Test Behavior not code. 37
- 38. VIEWMODEL LAYER WD40 foryour data. Intermediate view context. Umbrella for interfaces. Thin (5-15 % of code) 38
- 39. VIEWMODEL CONNECTIONS View Model Model View Model Model ViewModel Model View Model Model Core 39
- 40. VIEW MODELTESTING TDD As simpleas possible. Model state changes —ViewModel state changes ViewModel receive call — Model receive call Can hold more than one model. 40
- 41.
- 42. FACADES Holding temporary contexts. ThinAPI Join several Core APIs. 42
- 43. FACADES: EXAMPLES Create newappointment in calendar. Write email. Fail possible action etc. 43
- 44. CORE Fail = Crash Minimumframeworks. (Core Data instances may be exceptions) Do not owns a facades. Owns services. Data consistence. 44
- 45. SERVICES All system API Allframeworks. Request / Response API. No cross service communication. 45
- 46. MODEL: PS Can besimpler. Much simpler. 46
- 47. WHAT ABOUT BINDINGS? Anybindings is implementation detail. Cross layer usage. At least cross object. 47
- 48. KINDS OF MESSAGES: FROM:TO: Data Data Call Call Data 48
- 49. BINDINGS AS REACTIONS SOURCE:DESTINATION: State State Action Broadcast State 49
- 50. APPLE PUSH OPTIONS SOURCE:DESTINATION: set @property Setter Call method Method 50
- 51. APPLE PUSH OPTIONS SOURCE:DESTINATION: set @property Setter Call method Method Source is depend on Destination. Abstract layer depend on Concrete 51
- 52. APPLE PULL OPTIONS SOURCE:DESTINATION: KVO KVO - observe… NSNotification @selector() 52
- 53. APPLE PULL OPTIONS SOURCE:DESTINATION: KVO KVO - observe… NSNotification @selector() String based typing. Runtime error detection. Threads and ownership 53
- 54. RAC OPTIONS: SOURCE: DESTINATION: @property… RAC(…) = … rac_liftSelector: RACSignal* … RAC(…) = … 54
- 55.
- 56. RAC USING: SUBSCRIBENEXT Don’t 56
- 57. RAC USING: SUBSCRIBENEXT rac_liftSelector RAC(…) Exception: -(RACSignal*)fn (limited context) 57
- 58. RAC USING: NOLOGIC INSIDE Do not mix with UIKit Do not mix with Networking Do not mix with Layout Do not mix with CoreData Do not mix with Threading 58
- 59.
- 60.
- 61. RAC USING: DECOMPOSE Fixingon instance Tech details Actual binding 61
- 62.
- 63.
- 64. RAC USING: DOUBLEWEAK 64
- 65. RAC USING: DOUBLEWEAK view not loaded yet first value missed replay value 65
- 66.
- 67.
- 68.
- 69.