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Swift dependency injection

Swift dependency injection


A light Swift library to manage dependency injection easily.



Install with CocoaPod.

pod 'Cobb'

Swift Package Manager

Install Cobb simply adding GitHub link to Xcode project throught Swift Package Manager.



Let's take as example a simple achitecture.

struct NetworkService {
  func login(username: String, password: String) -> User {

struct DatabaseService {
  func insert(user: User) {

struct Repository {
  let network: NetworkService
  let database: DatabaseService
  func login(username: String, password: String) -> User {
    let user = network.login(username: username, password: password)
    database.insert(user: user)
    return user

Using Cobb builders it's possible to define dependencies of application's layers.

Dependencies {
  Factory { Database() }
  Factory { NetworkService() }
  Singleton { Repository(network: inject(), database: inject()) }

Then in other classes (such as UIViewController) or structs.

class FirstViewController: UIViewController {
  @Injected var repository: Repository
  override func viewDidLoad() {
    DispatchQueue.global(qos: .utility).async {
      let user = repository.login(username: "username@domanin.com", password: "password")
      DispatchQueue.main.async {
        // Update UI

injected() resolves automatically dependencies defined in Dependencies builder.
Factory defines a dependency that when resolved returns a new instance.
Singleton defines a dependency that behavies like a singleton, so when resolved returns the same instance through the whole application.
dream() actually configures dependencies.
@Injected resolves the dependency and return an instance of the specified type.

That's it!


Dario Pellegrini, pellegrini.dario.1303@gmail.com


Cobb is available under the MIT license. See the LICENSE file for more info.


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Last commit: 5 days ago

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