Swift protocol requring method returning protocols - swift

Question

I am trying to make following code compile.
Basically I want to have object conforming multiple protocols, for example network service that exposes different groups of API to different parts of app (for example: login API to loginController, sharing API to shareController)
+
I want this service to be injected using networkXProvider protocols e.g. implement Dependency Injection (for example I want to pass to LoginController an Injection that adopts LoginControllerProvider and FetchingUsersFromDBProvider):
protocol MyAccountCommunicator {
func getAccountData() -> String
}
protocol EventsCommunicator {
func getEvents() -> String
}
class NetworkManager: MyAccountCommunicator, EventsCommunicator {
func getAccountData() -> String {
return "Accounts"
}
func getEvents() -> String {
return "Events"
}
}
protocol MyAccountCommunicatorProvider {
var networkCommunicator: MyAccountCommunicator { get }
}
protocol EventsCommunicatorProvider {
var networkCommunicator: EventsCommunicator { get }
}
class Injector: MyAccountCommunicatorProvider, EventsCommunicatorProvider {
var networkCommunicator: NetworkManager = NetworkManager()
}
Playground fails with following error:
error: strings.playground:29:7: error: type 'Injector' does not
conform to protocol 'MyAccountCommunicatorProvider' class Injector:
MyAccountCommunicatorProvider, EventsCommunicatorProvider {
^
strings.playground:30:9: note: candidate has non-matching type
'NetworkManager'
var networkCommunicator: NetworkManager = NetworkManager()
^
error: strings.playground:29:7: error: type 'Injector' does not
conform to protocol 'EventsCommunicatorProvider' class Injector:
MyAccountCommunicatorProvider, EventsCommunicatorProvider {
^
strings.playground:30:9: note: candidate has non-matching type
'NetworkManager'
var networkCommunicator: NetworkManager = NetworkManager()
Environment: swift4, XCode9

Answer 1

Why do you need MyAccountCommunicatorProvider and EventsCommunicatorProvider protocols? What if you combine them into one?
protocol CommunicatorProvider {
var networkCommunicator: NetworkManager { get }
}
class Injector: CommunicatorProvider {
var networkCommunicator = NetworkManager()
}

Answer 2

protocol MyAccountCommunicator {
func getAccountData() -> String
}
protocol EventsCommunicator {
func getEvents() -> String
}
protocol MyAccountCommunicatorProvider {
var accountCommunicator: MyAccountCommunicator { get }
}
protocol EventsCommunicatorProvider {
var eventCommunicator: EventsCommunicator { get }
}
class NetworkManager: MyAccountCommunicator, EventsCommunicator {
func getAccountData() -> String {
return "Accounts"
}
func getEvents() -> String {
return "Events"
}
}
class Injector: MyAccountCommunicatorProvider, EventsCommunicatorProvider {
var networkManager = NetworkManager()
var accountCommunicator: MyAccountCommunicator {
return networkManager
}
var eventCommunicator: EventsCommunicator {
return networkManager
}
}

Answer 3

You can use like this :
protocol MyAccountCommunicatorProvider {
var networkCommunicator1: MyAccountCommunicator { get }
}
protocol EventsCommunicatorProvider {
var networkCommunicator2: EventsCommunicator { get }
}
class Injector: MyAccountCommunicatorProvider, EventsCommunicatorProvider {
var networkCommunicator: NetworkManager = NetworkManager()
lazy var networkCommunicator1: MyAccountCommunicator = {
return networkCommunicator
}()
lazy var networkCommunicator2: EventsCommunicator = {
return networkCommunicator
}()
}