MVC-RS par Grégoire Lhotelier

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MVC-RS

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MVC-RS

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Vanilla MVC

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Reusable Swift

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Reusable Swift

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Reusable Swift

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Reusable Swift

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Reusable View

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Reusable View

import AppKit

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Reusable View

import AppKit

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Reusable Model?

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No UIKit classes in the Model

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Model layer

• modelize a domain

• talks to the Persistence layer

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Persistence compatibility 💾

db A 😀 😀 😀 😀 😀

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Persistence compatibility 💾

db A 😀 😀 😀 😀 😀

db B 😀 😞 😩 😭☹

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M VC

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M VC💾

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S

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Storage

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M VC💾 S

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Storage Layer

• talks to the Persistence layer

• convert raw data to Model instances

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Persistence 💾

• async

• success

• failure

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Convert data

• raw data -> Model entities

• Model entities -> raw data

• might fail

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enum Result<T> {

case success(T) case failure(Error)

}

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struct Car { let model: String let image: Data }

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protocol CarsStorage { func read(onComplete: (Result<[Car]>) -> Void) }

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protocol CarsStorage { func read(onComplete: (Result<[Car]>) -> Void) func create(car: Car, onComplete: (Error?) -> Void) func update(car: Car, onComplete: (Error?) -> Void) func delete(car: Car, onComplete: (Error?) -> Void) }

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Model layer

• modelize a domain

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Reusable Model

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Reusable Storage

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Reusable Storage

% Persistence

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M VC

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use case C

use case Duse case A

use case Buse case E

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use case C

use case Duse case A

use case Buse case E

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use case C

use case Duse case A

use case Buse case E

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final class CarsListController: UITableViewController { func tableView(tv: UITableView, didSelectRowAt indexPath: IndexPath) { let car = cars[indexPath.row] let next = CarDetailsController(car: car) navigationController?.pushViewController(next, animated: true) } }

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final class CarsListController: UITableViewController { func tableView(tv: UITableView, didSelectRowAt indexPath: IndexPath) { let car = cars[indexPath.row] let next: UIViewController if User.currentUser.isReadOnly { next = CarDetailsController(car: car) } else { next = CarFormController(car: car) } navigationController?.pushViewController(next, animated: true) } }

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Dependency Injection?

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final class CarsListController: UITableViewController { var cars: [Car]

init(cars: [Car]) { self.cars = cars super.init() } }

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final class CarsListController: UITableViewController { var cars: [Car]? // nil until the data is loaded

init() { super.init() }

override func viewDidLoad() { super.viewDidLoad() CarsModel.getCars { cars in self.cars = cars self.tableView.reloadData() } }

}

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Controller states

• loading

• error

• empty

• actual

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R

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Router

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M VC💾 S

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M VC💾 SR

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Router Layer

• talks to the Storage

• coordinates the Controllers

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showLoading() carsStorage.read { switch $0 { case .success(let cars): if cars.isEmpty { self.showEmpty() } else { self.show(CarsListController(cars: cars)) } case .failure(let error): self.showError(error) } }

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Dependency Injection!

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Controllers coordination

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final class CarsListController: UITableViewController { func tableView(tv: UITableView, didSelectRowAt indexPath: IndexPath) { let car = cars[indexPath.row] let next = CarDetailsController(car: car) navigationController?.pushViewController(next, animated: true) } }

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final class CarsListController: UITableViewController { var carTouched: (Car) -> Void func tableView(tv: UITableView, didSelectRowAt indexPath: IndexPath) { let car = cars[indexPath.row] carTouched(car) }

}

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let carsListController = CarsListController(cars: cars) show(carsListController)

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let carsListController = CarsListController(cars: cars) carsListController.carTouched = { self.showCarDetails(car: $0) } show(carsListController)

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let carsListController = CarsListController(cars: cars) carsListController.carTouched = { if User.currentUser.isReadOnly { self.showCarDetails(car: $0) } else { self.showCarForm(car: $0) } } show(carsListController)

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Advantages

• MVC-based

• Reuse Models everywhere

• Very light & dumb Controllers

• Easily testable

• Easy deep linking

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Thank you!

🧀