swift - 如何从 CloudKit 中存储的位置反转地理编码纬度和经度？ - swift 3

Question

我正在尝试找出如何对存储在 CloudKit 中的 CLLocation 进行反向地理编码。我将位置存储在记录中，并且我知道它存储为纬度和经度。 Here's my record. The latitude and longitude appear I just took them out for now.不过，我希望能够使位置用户可读，因此又名反向地理编码，以获取城市和州。到目前为止，我已经看过这里，但没有任何关于我可以存储在 CloudKit 中的位置的反向地理编码。

这是我的模型:

class Peek: CloudKitSyncable {

    static let kType = "Peek"
    static let kPhotoData = "photoData"
    static let kTimeStamp = "timestamp"
    static let kTitle = "title"
    static let kText = "text"
    static let kLocation = "location"
    static let kCity = "city"

    let title: String
    let text: String
    let photoData: Data?
    let timestamp: Date
    var location: CLLocation
    var comments: [Comment]
    var photo: UIImage? {

        guard let photoData = self.photoData else { return nil }
        return UIImage(data: photoData)
    }

    init(title: String, timestamp: Date = Date(), text: String, photoData: Data?, comments: [Comment] = [], location: CLLocation) {
        self.title = title
        self.timestamp = timestamp
        self.text = text
        self.photoData = photoData
        self.comments = comments
        self.location = location
    }

    var recordType: String {
        return Peek.kType
    }

    var cloudKitRecordID: CKRecordID?

    convenience required init?(record: CKRecord) {

        guard let timestamp = record.creationDate,
            let photoAsset = record[Peek.kPhotoData] as? CKAsset,
            let title = record[Peek.kTitle] as? String,
            let text = record[Peek.kText] as? String,
        let location = record[Peek.kLocation] as? CLLocation else { return nil }
        let photoData = try? Data(contentsOf: photoAsset.fileURL)
        self.init(title: title, timestamp: timestamp, text: text, photoData: photoData, location: location)
        cloudKitRecordID = record.recordID
    }

    fileprivate var temporaryPhotoURL: URL {
        let temporaryDirectory = NSTemporaryDirectory()
        let temporaryDirectoryURL = URL(fileURLWithPath: temporaryDirectory)
        let fileURL = temporaryDirectoryURL.appendingPathComponent(UUID().uuidString).appendingPathExtension("jpg")

        try? photoData?.write(to: fileURL, options: .atomic)

        return fileURL
    }

}
extension CKRecord {

    convenience init(_ peek: Peek) {
        let recordID = CKRecordID(recordName: UUID().uuidString)
        self.init(recordType: peek.recordType, recordID: recordID)

        self[Peek.kTitle] = peek.title as String? as CKRecordValue?
        self[Peek.kText] = peek.text as String? as CKRecordValue?
        self[Peek.kTimeStamp] = peek.timestamp as CKRecordValue?
        self[Peek.kLocation] = peek.location as CKRecordValue?
        self[Peek.kPhotoData] = CKAsset(fileURL: peek.temporaryPhotoURL)
    }
}

我还有一个 LocationManager 文件:

class LocationManager: NSObject {

    static let sharedInstance = LocationManager()

    override init() {
        super.init()
        locationManager.delegate = self
    }

    var locationManager = CLLocationManager()
    var currentLocation: CLLocation?

    func requestCurrentLocation() {
        locationManager.requestLocation()
    }
}

extension LocationManager: CLLocationManagerDelegate {

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        currentLocation = locations.first
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print("error: \(error.localizedDescription)")
    }

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedWhenInUse {
            locationManager.requestLocation()
        }
    }
}

Answer 1

Apple 提供了一种内置于 Core Location 的 CLGeocoder 类中的方法。 Here are the docs 。如果成功，完成处理程序将允许您访问一组 CLPlacemark，这样您就可以获取其中一个并访问您需要的任何人类可读元素。变量的名称非常通用，可以覆盖世界各地的位置，因此您必须深入挖掘才能准确找到您需要的内容。 Check the docs有关可用变量的确切详细信息，请访问 CLPlacemark。在您的特定情况下，您将分别需要城市和州的 locality 和 administrativeArea。

用法如下:

let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
  guard let placemarks = placemarks, let placemark = placemarks.first else { return }
  if let city = placemark.locality, let state = placemark.administrativeArea {
    //Set your labels or whatever
  }
}