概念
- 地图：系统地图（MKMapView），高德地图（MAMapView）
- 坐标系：GPS坐标系（WGS84），火星坐标系（GCJ02）
- 定位：系统定位（CLLocationManager），
苹果系统地图在海外全球通用，为GPS坐标系。在国内使用的是高德数据，所以返回的经纬度是火星坐标系的。而CoreLocation返回的坐标是GPS坐标系（WGS84），所以需要把CoreLocation返回的坐标转换位火星坐标。
可以用下面的代码进行修正，调用transformFromWGSToGCJ。
import Foundation
import CoreLocation
class ZJ_MapKits{
//WGS-84：是国际标准，GPS坐标（Google Earth使用、或者GPS模块）
//GCJ-02：中国坐标偏移标准，Google Map、高德、腾讯使用
//BD-09： 百度坐标偏移标准，Baidu Map使用
let a = 6378245.0;
let ee = 0.00669342162296594323;
let pi = 3.14159265358979324;
let xPi = Double.pi * 3000.0 / 180.0;
//WGS-84 --> GCJ-02
func transformFromWGSToGCJ(wgsLoc:CLLocationCoordinate2D)->CLLocationCoordinate2D
{
var adjustLoc=CLLocationCoordinate2D();
if( isLocationOutOfChina(location: wgsLoc))
{
adjustLoc = wgsLoc;
}
else
{
var adjustLat = transformLatWithX(x: wgsLoc.longitude - 105.0 ,y:wgsLoc.latitude - 35.0);
var adjustLon = transformLonWithX(x: wgsLoc.longitude - 105.0 ,y:wgsLoc.latitude - 35.0);
let radLat = wgsLoc.latitude / 180.0 * pi;
var magic = sin(radLat);
magic = 1 - ee * magic * magic;
let sqrtMagic = sqrt(magic);
adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * cos(radLat) * pi);
adjustLoc.latitude = wgsLoc.latitude + adjustLat;
adjustLoc.longitude = wgsLoc.longitude + adjustLon;
}
return adjustLoc;
}
func transformLatWithX(x:Double,y:Double)->Double
{
var lat = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y ;
lat += 0.2 * sqrt(fabs(x));
lat += (20.0 * sin(6.0 * x * pi)) * 2.0 / 3.0;
lat += (20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;
lat += (20.0 * sin(y * pi)) * 2.0 / 3.0;
lat += (40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0;
lat += (160.0 * sin(y / 12.0 * pi)) * 2.0 / 3.0;
lat += (320 * sin(y * pi / 30.0)) * 2.0 / 3.0;
return lat;
}
func transformLonWithX(x:Double,y:Double)->Double
{
var lon = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y ;
lon += 0.1 * sqrt(fabs(x));
lon += (20.0 * sin(6.0 * x * pi)) * 2.0 / 3.0;
lon += (20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;
lon += (20.0 * sin(x * pi)) * 2.0 / 3.0;
lon += (40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0;
lon += (150.0 * sin(x / 12.0 * pi)) * 2.0 / 3.0;
lon += (300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0;
return lon;
}
//GCJ-02 --> BD-09
func transformFromGCJToBaidu(p:CLLocationCoordinate2D) -> CLLocationCoordinate2D
{
let z = sqrt(p.longitude * p.longitude + p.latitude * p.latitude) + 0.00002 * sqrt(p.latitude * pi);
let theta = atan2(p.latitude, p.longitude) + 0.000003 * cos(p.longitude * pi);
var geoPoint=CLLocationCoordinate2D();
geoPoint.latitude = (z * sin(theta) + 0.006);
geoPoint.longitude = (z * cos(theta) + 0.0065);
return geoPoint;
}
//BD-09 --> GCJ-02
func transformFromBaiduToGCJ(p:CLLocationCoordinate2D)-> CLLocationCoordinate2D
{
let x = p.longitude - 0.0065, y = p.latitude - 0.006;
let z = sqrt(x * x + y * y) - 0.00002 * sin(y * xPi);
let theta = atan2(y, x) - 0.000003 * cos(x * xPi);
var geoPoint = CLLocationCoordinate2D();
geoPoint.latitude = z * sin(theta);
geoPoint.longitude = z * cos(theta);
return geoPoint;
}
//GCJ-02 --> WGS-84
func transformFromGCJToWGS(p:CLLocationCoordinate2D) -> CLLocationCoordinate2D
{
let threshold = 0.00001;
// The boundary
var minLat = p.latitude - 0.5;
var maxLat = p.latitude + 0.5;
var minLng = p.longitude - 0.5;
var maxLng = p.longitude + 0.5;
var delta = 1.0;
let maxIteration = 30;
// Binary search
while(true)
{
let leftBottom = transformFromWGSToGCJ(wgsLoc: CLLocationCoordinate2D(latitude: minLat,longitude: minLng));
let rightBottom = transformFromWGSToGCJ(wgsLoc: CLLocationCoordinate2D(latitude : minLat,longitude : maxLng));
let leftUp = transformFromWGSToGCJ(wgsLoc: CLLocationCoordinate2D(latitude : maxLat,longitude : minLng));
let midPoint = transformFromWGSToGCJ(wgsLoc: CLLocationCoordinate2D(latitude : ((minLat + maxLat) / 2),longitude : ((minLng + maxLng) / 2)));
delta = fabs(midPoint.latitude - p.latitude) + fabs(midPoint.longitude - p.longitude);
if(maxIteration <= 1 || delta <= threshold)
{
return CLLocationCoordinate2D(latitude: (minLat + maxLat) / 2, longitude: (minLng + maxLng) / 2);
}
if(isContains(point: p, p1: leftBottom, p2: midPoint))
{
maxLat = (minLat + maxLat) / 2;
maxLng = (minLng + maxLng) / 2;
}
else if(isContains(point: p, p1: rightBottom, p2: midPoint))
{
maxLat = (minLat + maxLat) / 2;
minLng = (minLng + maxLng) / 2;
}
else if(isContains(point: p, p1: leftUp, p2: midPoint))
{
minLat = (minLat + maxLat) / 2;
maxLng = (minLng + maxLng) / 2;
}
else
{
minLat = (minLat + maxLat) / 2;
minLng = (minLng + maxLng) / 2;
}
}
}
//WGS-84 --> BD-09
func transformFromWGSToBaidu(p:CLLocationCoordinate2D) -> CLLocationCoordinate2D
{
let gcj = transformFromWGSToGCJ(wgsLoc: p);
let bd = transformFromGCJToBaidu(p: gcj)
return bd;
}
//BD-09 --> WGS-84
func transformFromBaiduToWGS(p:CLLocationCoordinate2D) -> CLLocationCoordinate2D
{
let gcj = transformFromBaiduToGCJ(p: p)
let wgs = transformFromGCJToWGS(p: gcj)
return wgs;
}
//判断点是否在p1和p2之间
//point: 点
//p1: 左上角
//p2: 右下角
func isContains(point:CLLocationCoordinate2D , p1:CLLocationCoordinate2D, p2:CLLocationCoordinate2D)->Bool
{
return (point.latitude >= min(p1.latitude, p2.latitude) && point.latitude <= max(p1.latitude, p2.latitude)) && (point.longitude >= min(p1.longitude,p2.longitude) && point.longitude <= max(p1.longitude, p2.longitude));
}
//是否在中国以外
func isLocationOutOfChina(location:CLLocationCoordinate2D) -> Bool
{
if (location.longitude < 72.004 || location.longitude > 137.8347 || location.latitude < 0.8293 || location.latitude > 55.8271){
return true;
}else{
return false;
}
}
///获取两点之间的距离
static func distanceByPoint(lat1:Double,lat2 :Double,lng1 :Double,lng2:Double)->Double{
let dd = Double.pi/180;
let x1=lat1*dd;
let x2=lat2*dd;
let y1=lng1*dd;
let y2=lng2*dd;
let R = 6371004;
let temp = 2 - 2 * cos(x1) * cos(x2) * cos(y1-y2) - 2 * sin(x1) * sin(x2);
let distance = Double(2) * Double(R) * asin(sqrt(temp)/2);
//返回 m
return distance;
}
///获取两点之间的距离
static func distanceByPoint(point1:CLLocationCoordinate2D,point2:CLLocationCoordinate2D)->Double{
return distanceByPoint(lat1: point1.latitude, lat2: point2.latitude, lng1: point1.longitude, lng2: point2.longitude);
}
}