ios - MVP 架构模式示例。 swift

Question

我想学习经典的 MVP 架构模式，为此尝试在 Swift 上实现天气应用程序。我从理论上了解了它应该如何工作，但实际上停留在基本理解上。现在我有一个模型:

型号

class WeatherModel: Codable {
    var name: String?
    var main: Main?
}

class Main: Codable {
    var temperature: Float?
    var pressure: Int?
    var humidity: Int?
    private enum CodingKeys: String, CodingKey {
        case temperature = "temp"
        case pressure
        case humidity
    }

查看

final class WeatherViewController: UIViewController {
    @IBOutlet weak var cityTextField: UITextField!
    @IBOutlet weak var temperatureLabel: UILabel!
    @IBOutlet weak var pressureLabel: UILabel!
    @IBOutlet weak var humidityLabel: UILabel!

    private var presenter: WeatherPresenter!

    // MARK: - Lifecycle

    override func viewDidLoad() {
        super.viewDidLoad()
        presenter = WeatherPresenter()
        cityTextField.delegate = self
        presenter.delegate = self

    }

    @IBAction func buttonClicked(_ sender: Any) {
        let city = cityTextField.text
        if let city = city {
            presenter.loadWeatherFor(city: city)
        }
    }
}

extension WeatherViewController: WeatherPresenterProtocol {

    // MARK: - WeatherPresenterProtocol

    func showWeather(data: WeatherModel) {
        if let temperature = data.main?.temperature {
            self.temperatureLabel.text = String(temperature)
        }
        if let pressure = data.main?.pressure {
            self.pressureLabel.text = Constants.pressure + String(pressure)
        }
        if let humidity = data.main?.humidity {
            self.humidityLabel.text = Constants.humidity + String(humidity)
        }
    }
}

演示者

protocol WeatherPresenterProtocol: class {
    func showWeather(data: WeatherModel) // ?
}

final class WeatherPresenter {
    var model: WeatherModel!
    weak var delegate: WeatherPresenterProtocol?

    func loadWeatherFor(city: String) {
        Network.shared.getWeather(city) { [weak self] (weather, error) in
            DispatchQueue.main.async {
                self?.model = weather
            }
        }
    }
}

在 Presenter 中，我从网络服务接收数据，但我无法理解如何使用此数据更新 View(如何在 Presenter< 中实现协议(protocol)) 因为 View 不应该知道模型，但在我的例子中它会知道(任何实现经典 MVP 的想法都将不胜感激!

第二个问题:如何在 Presenter 中实现协议(protocol)以获取 Model(如我从 https://www.youtube.com/watch?v=qzTeyxIW_ow 中截取的图片所示)

Answer 1

改变

func showWeather(data: WeatherModel)

到

func showWeather(temperature: String, pressure: String, humidity: String)

将这些字符串的构造从View移到Presenter。这样，View 仍然不知道模型。

Presenter 不应直接与完整 View 对话，而应仅与协议(protocol)对话。