21/09/2017 Antoine Descamps 

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protocol Service { func doSomething() -> Void } extension Service { var className: String { return String(describing: type(of: self)) } func doSomething() -> Void { print("Hello "+className) } } 

class AlphaService: Service { class var sharedInstance: AlphaService { fileprivate struct Singleton { static let instance = AlphaService() } return Singleton.instance } } class MyFirstClass { init() { } func helloWorld() { AlphaService.sharedInstance.doSomething() } } let firstClass = MyFirstClass() firstClass.helloWorld() 

class MySecondClass { var service: AlphaService init() { service = AlphaService.sharedInstance } func helloWorld() { service.doSomething() } } let secondClass = MySecondClass() secondClass.helloWorld() 

class MyThirdClass { var service: AlphaService init(service: AlphaService) { self.service = service } func helloWorld() { service.doSomething() } } let thirdClass = MyThirdClass(service: AlphaService.sharedInstance) thirdClass.helloWorld() 

class BetaService: Service { init() { } } class MyFifthClass { var service: BetaService init(service: BetaService) { self.service = service } func helloWorld() { service.doSomething() } } let betaService = BetaService() let fifthClass = MyFifthClass(service: betaService) fifthClass.helloWorld() 

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Controller Service Référence Controller Service ServiceImpl Implémente Référence 

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protocol GammaService: Service { } class GammaServiceImpl: GammaService { init() { } } class GammaServiceMock: GammaService { init() { } } 

class MySixthClass { var service: GammaService init(service: GammaService) { self.service = service } func helloWorld() { service.doSomething() } } let gammaService = GammaServiceImpl() let sixthClass = MySixthClass(service: gammaService) sixthClass.helloWorld() 

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let deltaService = DeltaService() let constructorClass = MyConstructorClass(service: deltaService) constructorClass.helloWorld() let parameterClass = MyParameterClass() parameterClass.service = deltaService parameterClass.helloWorld() 

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Assembly ViewController 1 Service A ViewController 2 Service B Service A 

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