SwiftInject DI Example

AnyInteractor.swift

class AnyInteractor: DBAccessable {
  /*
  easy access to self.dbService
  */
}

AppDelegate.swift

class AppDelegate {
//...
  fileprivate let container = Container.defaultContainer() { container in
    container.register(DBServiceProtocol.self) { _ in CoreDataService() } .inObjectScope(.container)
  }
//...
}

CoreDataService.swift

class CoreDataService: DBServiceProtocol {
  /*
  protocol implementation
  */
}

DBAccess.swift

protocol DBServiceProtocol {
  func eat()
  func pray()
  func love()
}

protocol DBAccessable {
  var dbService : DBServiceProtocol { get }
}

extension DBAccessable {
  var dbService : DBServiceProtocol { get { return Container.defaultContainer().resolve(DBServiceProtocol.self)! } }
}

DefaultContainer.swift

import Foundation
import Swinject

fileprivate static let _defaultContainer = Container()

extension Container {
  public static func defaultContainer() -> Container { return _defaultContainer }
  public static func defaultContainer( _ registeringClosure: (Container) -> Void) -> Container {
    registeringClosure(_defaultContainer)
    return _defaultContainer
  }
}