Sending messages with delegates

DelegatesSend.swift

// 1. Declare which messages can be sent to the delegate
// File ProductCategoriesCoreDelegate.swift
protocol ProductCategoriesCoreDelegate: class {
    //Add arguments if you need to send some information
    func setupSubmodules(with product: Product)
}


// 2. Create a delegate to send him a message
// File ProductPresenter.swift

class ProductPresenter {
    
    // MARK: Properties
    
    weak var view: ProductView?
    var router: ProductWireframe?
    var interactor: ProductUseCase?
    var categoriesDelegate: ProductCategoriesCoreDelegate?
    var product: Product?
}
    
extension ProductPresenter: ProductPresentation {
    
    func onViewDidLoad() {
        if let product = product {
            // Presenter initializes the delegate to whom he wants to send message
            categoriesDelegate = router?.setupModule(with: product) // Make sure you customize this static function will return the delegate
            // Presenter sends a message
            categoriesDelegate?.setupSubmodules(with: product)
        }
    } 
}

// 3. Implement the delegate protocol to do something when you receive the message
// ProductCategoriesPresenter.swift

class ProductCategoriesPresenter: ProductCategoriesPresentation {
    ...
}
extension ProductCategoriesPresenter: ProductCategoriesCoreDelegate {
    
    func setupSubmodules(with product: Product) {
        //Do what you nee here
    }
    
}