将MapKit经纬度转换为DMS格式
我可以通过以下方式确定地图中心位置的经纬度：
func TargetGridReference(outletMapView_PrimaryTargetLocationMap: MKMapView, regionDidChangeAnimated animated: Bool) { let ThreatGridReference = outletMapView_PrimaryTargetLocationMap.centerCoordinate let mapLatitude = String(format:"%.13f",ThreatGridReference.latitude) let mapLongitude = String(format:"%.13f",ThreatGridReference.longitude) let latAndLong = "Lat: \(mapLatitude) \nLong: \(mapLongitude)" self.outletLabel_TargetGridReference.text = latAndLong tempThreatGridReference = ThreatGridReference tempThreatGridReferenceLat = mapLatitude tempThreatGridReferenceLon = mapLongitude } 这给了我在巴黎艾菲尔铁塔的纬度：
Lat: 48.8582487759147 Long: 2.2945180844931
我怎样才能将上述转换为以下DMS格式的Swift？
lat: 48° 51' 29.6956" N long: 2° 17' 40.2651" E
MapKit是否提供自动转换为UTM，UPS，MGRS等各种坐标系？
不幸的是，没有自动转换，但您可以轻松创build一个如下：
Swift 3或更高版本
func coordinateToDMS(latitude: Double, longitude: Double) -> (latitude: String, longitude: String) { let latDegrees = abs(Int(latitude)) let latMinutes = abs(Int((latitude * 3600).truncatingRemainder(dividingBy: 3600) / 60)) let latSeconds = Double(abs((latitude * 3600).truncatingRemainder(dividingBy: 3600).truncatingRemainder(dividingBy: 60))) let lonDegrees = abs(Int(longitude)) let lonMinutes = abs(Int((longitude * 3600).truncatingRemainder(dividingBy: 3600) / 60)) let lonSeconds = Double(abs((longitude * 3600).truncatingRemainder(dividingBy: 3600).truncatingRemainder(dividingBy: 60) )) return (String(format:"%d° %d' %.4f\" %@", latDegrees, latMinutes, latSeconds, latitude >= 0 ? "N" : "S"), String(format:"%d° %d' %.4f\" %@", lonDegrees, lonMinutes, lonSeconds, longitude >= 0 ? "E" : "W")) }
let dms = coordinateToDMS(latitude: 48.8582487759147, longitude: 2.2945180844931) print(dms.latitude) // "48° 51' 29.6956" N" print(dms.longitude) // "2° 17' 40.2651" E"
您还可以扩展CLLocationCoordinate2D以获取您的纬度/经度DMS描述：
import MapKit extension CLLocationCoordinate2D { var latitudeMinutes: Double { return (latitude * 3600).truncatingRemainder(dividingBy: 3600) / 60 } var latitudeSeconds: Double { return (latitude * 3600) .truncatingRemainder(dividingBy: 3600) .truncatingRemainder(dividingBy: 60) } var longitudeMinutes: Double { return (longitude * 3600).truncatingRemainder(dividingBy: 3600) / 60 } var longitudeSeconds: Double { return (longitude * 3600) .truncatingRemainder(dividingBy: 3600) .truncatingRemainder(dividingBy: 60) } var dms:(latitude: String, longitude: String) { return (String(format:"%d° %d' %.4f\" %@", Int(abs(latitude)), Int(abs(latitudeMinutes)), abs(latitudeSeconds), latitude >= 0 ? "N" : "S"), String(format:"%d° %d' %.4f\" %@", Int(abs(longitude)), Int(abs(longitudeMinutes)), abs(longitudeSeconds), longitude >= 0 ? "E" : "W")) } }
let coord = CLLocationCoordinate2D(latitude: 48.8582487759147, longitude: 2.2945180844931) coord.dms.latitude // "48° 51' 29.6956" N" coord.dms.longitude // "2° 17' 40.2651" E"
接受答案的第一部分有一个轻微的错字：
let latDegrees = abs(Int(lat))
将总是产生正的latDegrees ，因此返回部分latDegrees >= 0 ? "N" : "S" latDegrees >= 0 ? "N" : "S"无论input如何， latDegrees >= 0 ? "N" : "S"将始终产生N lat: Double符号。
只需要改变lat >= 0 ? "N" : "S") lat >= 0 ? "N" : "S")以及lon >= 0 ? "E" : "W") lon >= 0 ? "E" : "W")直接评估input值的符号。
我对这个代码进行了一些更新，以使它在Swift3中工作（主要是使用.truncatingRemainder(dividingBy: )而不是% ），并将其扩展为输出DMM，并包含将DMM和DMS转换为DD的function。
extension CLLocationCoordinate2D { var latitudeMinutes: Double { return (latitude * 3600).truncatingRemainder(dividingBy: 3600) / 60 } var latitudeSeconds: Double { return ((latitude * 3600).truncatingRemainder(dividingBy: 3600)).truncatingRemainder(dividingBy: 60) } var longitudeMinutes: Double { return (longitude * 3600).truncatingRemainder(dividingBy: 3600) / 60 } var longitudeSeconds: Double { return ((longitude * 3600).truncatingRemainder(dividingBy: 3600)).truncatingRemainder(dividingBy: 60) } var dms:(latitude: String, longitude: String) { return (String(format:"%d°%d'%.1f\"%@", Int(abs(latitude)), Int(abs(latitudeMinutes)), abs(latitudeSeconds), latitude >= 0 ? "N" : "S"), String(format:"%d°%d'%.1f\"%@", Int(abs(longitude)), Int(abs(longitudeMinutes)), abs(longitudeSeconds), longitude >= 0 ? "E" : "W")) } var dmm: (latitude: String, longitude: String) { return (String(format:"%d°%.4f'%@", Int(abs(latitude)), abs(latitudeMinutes), latitude >= 0 ? "N" : "S"), String(format:"%d°%.4f'%@", Int(abs(longitude)), abs(longitudeMinutes), longitude >= 0 ? "E" : "W")) } } var coord = CLLocationCoordinate2D(latitude: 41.40338, longitude: 2.17403) coord.latitude // 41.40338 coord.longitude // 2.17403 coord.latitudeMinutes // 24.20280000000009 coord.latitudeSeconds // 12.16800000000512 coord.longitudeMinutes // 10.44180000000001 coord.longitudeSeconds // 26.50800000000072 coord.dms.latitude // "41°24'12.2"N" coord.dms.longitude // "2°10'26.5"E" coord.dmm.latitude // "41°24.2028'N" coord.dmm.longitude // "2°10.4418'E"
这些转换function还允许input而不指示主要方向，而只是提供正面或负面：
func DMStoDD(latDeg: Double, latMin: Double, latSec: Double, latDir: String?, longDeg: Double, longMin: Double, longSec: Double, longDir: String?) -> CLLocationCoordinate2D { var latitude = CLLocationDegrees() if latDeg > 0 { latitude = CLLocationDegrees(latDeg + ((latMin*60)/3600) + (latSec/3600)) if latDir == "S" {latitude *= -1} } else{ latitude = CLLocationDegrees((latDeg * -1) + ((latMin*60)/3600) + (latSec/3600)) latitude *= -1 } var longitude = CLLocationDegrees() if longDeg > 0 { longitude = CLLocationDegrees(longDeg + ((longMin*60)/3600) + (longSec/3600)) if longDir == "W" {longitude *= -1} } else{ longitude = CLLocationDegrees((longDeg * -1) + ((longMin*60)/3600) + (longSec/3600)) longitude *= -1 } return CLLocationCoordinate2D(latitude: latitude, longitude: longitude) } coord = DMStoDD(latDeg: 41, latMin: 24, latSec: 12.2, latDir: "", longDeg: 2, longMin: 10, longSec: 26.5, longDir: "") coord.latitude // 41.40338888888889 coord.longitude // 2.174027777777777
和DMM到DD
func DMMtoDD(latDeg: Double, latMin: Double, latDir: String?, longDeg: Double, longMin: Double, longDir: String?) -> CLLocationCoordinate2D { var latitude = CLLocationDegrees() if latDeg > 0 { latitude = CLLocationDegrees(latDeg + ((latMin*60)/3600)) if latDir == "S" {latitude *= -1} } else{ latitude = CLLocationDegrees((latDeg * -1) + ((latMin*60)/3600)) latitude *= -1 } var longitude = CLLocationDegrees() if longDeg > 0 { longitude = CLLocationDegrees(longDeg + ((longMin*60)/3600)) if longDir == "W" {longitude *= -1} } else{ longitude = CLLocationDegrees((longDeg * -1) + ((longMin*60)/3600)) longitude *= -1 } return CLLocationCoordinate2D(latitude: latitude, longitude: longitude) } coord = DMMtoDD(latDeg: 41, latMin: 24.2028, latDir: "N", longDeg: 2, longMin: 10.4418, longDir: "E") coord.latitude // 41.40338 coord.longitude // 41.40338