我想学习经典的MVP架构模式并为此努力落实斯威夫特天气应用程序。我在理论学会了如何工作,但实际上是停留在基本的了解。现在我有一个模型:
模型
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
}
视图
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)
}
}
}
主持人
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
我接收来自网络服务的数据,但我不明白如何使用这些数据更新View
(如何实现Presenter
协议),因为View
不应该知道的模式,但在我的情况下,它会知道(任何想法来实现经典的MVP将不胜感激!
而第二个问题:如何在Presenter
实施协议得到Model
(因为它是在我从https://www.youtube.com/watch?v=qzTeyxIW_ow拍摄的照片所示)
更改
func showWeather(data: WeatherModel)
至
func showWeather(temperature: String, pressure: String, humidity: String)
从视图中演示移动这些字符串的建设。通过这种方式,视图保持无知的模型。
发言人应该不仅对协议直接对话完整视图。
你可以试试这个,在MVP的主持人将采取更新视图的照顾,所以修改你的演讲有视图属性。这里的观点主张不过是WeatherController实例。
在MVP而言,UIViewController的子类是事实上的意见,而不是主持人。
class WeatherPresenter : WeatherViewPresenter {
unowned let view: WeatherView
let weather: WeatherModel
required init(view: WeatherView, weather: WeatherModel) {
self.view = view
self.weather = weather
}
func updateWeatherView() {
//...update properties on your weather view
self.view.setTemperature(self.weather.temperature)
}
}
例如,要更新温度的标签,有一个协议设定温度值。你可以有多种方法来设置多个属性或具有一个用于所有天气看你的UI元素。
protocol WeatherView: class {
func setTemperature(temp: String)
//same for pressure, humid etc
}
现在写的天气节目主持人的协议
protocol WeatherViewPresenter {
init(view: WeatherView, weather: WeatherModel)
func updateWeatherView()
}
现在,你有天气类主持人的设置,你可以使用它像
class WeatherViewController : UIViewController, WeatherView {
var presenter: WeatherViewPresenter!
override func viewDidLoad() {
super.viewDidLoad()
let model = //your weather model
presenter = WeatherPresenter(view: self, weather: model)
}
func setTemperature(temp: String) {
self.temperatureLabel.text = temp
}
}
你从气象数据后,只需拨打self.presenter.updateWeatherView()
更新天气视图。
有关详细信息,请refer