在我的项目中，我有一个符合 CLLocationManagerDelegate 协议(protocol)的 LocationService 类，用于检测当前用户的位置。
class LocationService: NSObject, CLLocationManagerDelegate {
fileprivate let locationManager = CLLocationManager()
var location: Location? // Location(lat: Double, lon: Double)
override init() {
super.init()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
}
func getCurrentLocation() -> Location? {
locationManager.startUpdatingLocation()
// how can I catch a location?
return location
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.last {
if location.horizontalAccuracy > 0 {
locationManager.stopUpdatingLocation()
self.location = Location(lat: location.coordinate.latitude, lon: location.coordinate.latitude)
}
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print(error.localizedDescription)
}
}
我希望我的 WeatherPresenter 触发 LocationService 中的位置更新，并在找到位置后立即获取结果。有什么办法吗？
class WeatherPresenter {
unowned let delegate: WeatherViewDelegate
let weatherService = WeatherService()
let locationService = LocationService()
init(with delegate: WeatherViewDelegate) {
self.delegate = delegate
}
func getWeatherForCurrentLocation() {
if let location = locationService.getCurrentLocation() {
//...
}
}
}
最佳答案
您可以使用 Delegate 通知 WeatherPresenter 来自 LocationService 的更改
protocol LocationServiceDelegate: class { // Delegate protocol
func didUpdateLocation()
}
class LocationService: NSObject, CLLocationManagerDelegate {
weak var delegate: LocationServiceDelegate?
fileprivate let locationManager = CLLocationManager()
var location: Location? // Location(lat: Double, lon: Double)
override init() {
super.init()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
}
func startUpdatingLocation() { // Start updating called from presenter
locationManager.startUpdatingLocation()
}
func getCurrentLocation() -> Location? {
// how can I catch a location?
return location
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.last {
if location.horizontalAccuracy > 0 {
locationManager.stopUpdatingLocation()
self.location = Location(lat: location.coordinate.latitude, lon: location.coordinate.latitude)
self.delegate?.didUpdateLocation() // Notify delegate on change
}
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print(error.localizedDescription)
}
}
class WeatherPresenter: LocationServiceDelegate {
unowned let delegate: WeatherViewDelegate
let weatherService = WeatherService()
let locationService = LocationService()
init(with delegate: WeatherViewDelegate) {
self.delegate = delegate
self.locationService.delegate = self // Set self as delegate
self.locationService.startUpdatingLocation() // Requests start updating location
}
func didUpdateLocation() { // This will be called on location change
self.getWeatherForCurrentLocation()
}
func getWeatherForCurrentLocation() {
if let location = locationService.getCurrentLocation() {
//...
}
}
}
关于ios - MVP中的核心位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55290217/