Swift 4中的反向地理编码

Question

我正在尝试编写一个简单的方法,它被馈送CLLocationDegrees并返回一个CLPlacemark.看看Apple的文档,这似乎是一项简单的任务.

以下是我放入游乐场的内容:

import CoreLocation
// this is necessary for async code in a playground
import PlaygroundSupport 

// this is necessary for async code in a playground
PlaygroundPage.current.needsIndefiniteExecution = true

func geocode(latitude: CLLocationDegrees, longitude: CLLocationDegrees) -> CLPlacemark? {
  let location = CLLocation(latitude: latitude, longitude: longitude)
  let geocoder = CLGeocoder()

  var placemark: CLPlacemark?

  geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
    if error != nil {
      print("something went horribly wrong")
    }

    if let placemarks = placemarks {
      placemark = placemarks.first
    }
  }

  return placemark
}

let myPlacemark = geocode(latitude: 37.3318, longitude: 122.0312)

按照目前的情况,我的方法是返回零.我不确定我的错误在哪里,但我确信这对我来说是个愚蠢的东西.谢谢你的阅读.

Answer 1

import UIKit
import CoreLocation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

func geocode(latitude: Double, longitude: Double, completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void)  {
    CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude)) { placemark, error in
        guard let placemark = placemark, error == nil else {
            completion(nil, error)
            return
        }
        completion(placemark, nil)
    }
}

或者干脆:

func geocode(latitude: Double, longitude: Double, completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void)  {
    CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude), completionHandler: completion)
}

或扩展CLLocation:

extension CLLocation {
    func geocode(completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void)  {
        CLGeocoder().reverseGeocodeLocation(self, completionHandler: completion)
    }
}

要将地标标记为邮寄地址,您可以使用"联系人"框架CNPostalAddressFormatter:

import Contacts

extension Formatter {
    static let mailingAddress: CNPostalAddressFormatter = {
        let formatter = CNPostalAddressFormatter()
        formatter.style = .mailingAddress
        return formatter
    }()
}

extension CLPlacemark {
    var mailingAddress: String? {
        return postalAddress?.mailingAddress
    }
}

extension CNPostalAddress {
    var mailingAddress: String {
        return Formatter.mailingAddress.string(from: self)
    }
}

标

包含一组CLPlacemark对象.对于大多数地理编码请求,此数组应仅包含一个条目.但是,在指定地址无法解析到单个位置的情况下,前向地理编码请求可能会返回多个地标对象.如果请求被取消或获取地标信息时出错,则此参数为零.

有关CLPlacemark属性的更多信息,您可以检查此CLPlacemark

用法:

let location = CLLocation(latitude: -22.963451, longitude: -43.198242)
location.geocode { placemark, error in
    if let error = error as? CLError {
        print("CLError:", error)
        return
    } else if let placemark = placemark?.first {
        // you should always update your UI in the main thread
        DispatchQueue.main.async {
            //  update UI here
            print("name:", placemark.name ?? "unknown")

            print("address1:", placemark.thoroughfare ?? "unknown")
            print("address2:", placemark.subThoroughfare ?? "unknown")
            print("neighborhood:", placemark.subLocality ?? "unknown")
            print("city:", placemark.locality ?? "unknown")

            print("state:", placemark.administrativeArea ?? "unknown")
            print("subAdministrativeArea:", placemark.subAdministrativeArea ?? "unknown")
            print("zip code:", placemark.postalCode ?? "unknown")
            print("country:", placemark.country ?? "unknown", terminator: "\n\n")

            print("isoCountryCode:", placemark.isoCountryCode ?? "unknown")
            print("region identifier:", placemark.region?.identifier ?? "unknown")

            print("timezone:", placemark.timeZone ?? "unknown", terminator:"\n\n")

            // Mailind Address
            print(placemark.mailingAddress ?? "unknown")
        }
    }
}

这将打印

name: Morro da Saudade
address1: Rua Casuarina
address2: 597
neighborhood: Lagoa
city: Rio de Janeiro
state: RJ
subAdministrativeArea: unknown
zip code: 22011-040
country: Brazil

isoCountryCode: BR
region identifier: <-22.96345100,-43.19824200> radius 141.83
timezone: America/Sao_Paulo (current)

Rua Casuarina,597

拉戈阿

里约热内卢RJ

22011-040

巴西