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In iOS projects, dependency injection (DI) is typically implemented in the following ways:

  • Constructor Injection — dependencies are passed through the class constructor. This is the most explicit and safe method, which facilitates testing.
class NetworkManager {}

class ViewModel {
    let networkManager: NetworkManager

    init(networkManager: NetworkManager) {
        self.networkManager = networkManager
    }
}
  • Property Injection — dependencies are set via properties after the object is created. Used when dependencies are optional or cannot be passed through the constructor.
class ViewController: UIViewController {
    var viewModel: ViewModel?
}
  • Method Injection — dependencies are passed via method parameters when they are only needed for a specific call.

  • Using DI frameworks — for example, Swinject, which helps manage dependencies through containers.

The choice of method depends on the project architecture and requirements for testability and flexibility.