Example of Contract

MainSearchContract.swift

import Foundation

protocol MainSearchView: BaseView {
    func showCustomError(_ message: String?)
    func updateVisibility(onSearchController willBeActive: Bool)
    func showSearchResult(_ products: [Product]?, shouldAppend: Bool)
}

protocol MainSearchPresentation: class {
    func onViewDidLoad()
    func onWillPresentSearchController()
    func onSearchTermChanged(to searchTerm: String)
    func onProductFavoriteChanged(_ product: Product, to isFavorite: Bool)
    func onProductSelected(_ product: Product)
    func onInfiniteScrollTriggered()
}

protocol MainSearchUseCase: class {
    func searchProducts(with searchTerm: String, onPage page: Int)
    func updateProductFavorited(_ product: Product, to newValue: Bool)
}

protocol MainSearchInteractorOutput: class {
    func onFetchProductsSuccess(_ products: [Product]?, shouldAppend: Bool)
    func onFetchProductsFailure(message: String)
}

protocol MainSearchWireframe: class {
    func showProductScreen(delegate: ProductScreenDelegate, product: Product?)
}