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iOSDevUK 2015: Clean Code through Dependency In...
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AppFoundry
September 15, 2015
Programming
2
630
iOSDevUK 2015: Clean Code through Dependency Injection
This is a 5 minute fast-talk we gave at iOSDevUK 2015.
AppFoundry
September 15, 2015
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Transcript
Clean Code through Dependency Injection
Your host Mike Seghers Developer/Architect mike@appfoundry.be @mikeseghers
Creating apps: a recent history
2012
Coding Example Acceptable in 2012 struct SkeumorphicDesigner { func createDesign(requirements:
Requirements) -> Design { //Draws some boxes with stitches, applies colors //returns Design } } struct ObjectiveCDeveloper { func createApp(requirements: Requirements, design: Design) -> App { //Does some code between [], applies the design using //InterfaceBuilder, returns App }
Coding Example Acceptable in 2012 class AppFactory2012 { private let
developer:ObjectiveCDeveloper private let designer:SkeumorphicDesigner init() { developer = ObjectiveCDeveloper() designer = SkeumorphicDesigner() } public func createApp(requirements:Requirements) -> App { let design = designer.createDesign(requirements) return developer.createApp(requirements, design: design) } } … let appFactory = AppFactory2012() let app = appFactory.createApp(requirements)
2013
Coding Example Acceptable in 2013 struct FlatDesigner { func createDesign(requirements:
Requirements) -> Design { //Draws some flat boxes, applies less color, returns Design } } struct ObjectiveCDeveloper { … }
Coding Example Acceptable in 2013 class AppFactory2013 { private let
developer:ObjectiveCDeveloper private let designer:FlatDesigner init() { developer = ObjectiveCDeveloper() designer = FlatDesigner() } public func createApp(requirements:Requirements) -> App { let design = designer.createDesign(requirements) return developer.createApp(requirements, design: design) } } … let appFactory = AppFactory2013() let app = appFactory.createApp(requirements)
Current
Coding Example Acceptable in now struct SwiftDeveloper { func createApp(requirements:
Requirements, design: Design) -> App { //Does some code without semi-colons, applies the //design using StoryBoards, returns App } struct FlatDesigner { … }
Coding Example Acceptable in now class AppFactory2014 { private let
developer:SwiftDeveloper private let designer:FlatDesigner init() { developer = SwiftDeveloper() designer = FlatDesigner() } public func createApp(requirements:Requirements) -> App { let design = designer.createDesign(requirements) return developer.createApp(requirements, design: design) } } … let appFactory = AppFactory2014() let app = appFactory.createApp(requirements)
How many app factories does one need?
Coding Example Acceptable all the time protocol Designer { func
createDesign(requirements: Requirements) -> Design } protocol Developer { func createApp(requirements: Requirements, design: Design) -> App } extension SkeumorphicDesigner : Designer {} extension FlatDesigner : Designer {} extension ObjectiveCDeveloper : Developer {} extension SwiftDeveloper : Developer {}
Coding Example Acceptable all the time class AppFoundry { private
let developer:Developer private let designer:Designer init(developer: Developer, designer: Designer) { self.developer = developer self.designer = designer } func createApp(requirements:Requirements) -> App { let design = designer.createDesign(requirements) return developer.createApp(requirements, design: design) } }
Coding Example Acceptable all the time let developer = ObjectiveCDeveloper()
let designer = SkeumorphicDesigner() let oldSchoolFoundry = AppFoundry(developer: developer, designer: designer) oldSchoolFoundry.createApp(requirements)
Coding Example Acceptable all the time let developer = ObjectiveCDeveloper()
let designer = FlatDesigner() let playingItSaveFoundry = AppFoundry(developer: developer, designer: designer) playingItSaveFoundry.createApp(requirements)
Dependency Injection
Helps with reusable code
Dependency Injection
Helps with loose coupling
Dependency Injection
Helps with (unit) tests
Dependency Injection
Helps keep your code clean
Questions? Come talk to me! Mike Seghers Developer/Architect mike@appfoundry.be @mikeseghers
https://github.com/appfoundry/Reliant