ios系統經緯度轉百度經緯度及經緯度轉地址

標籤：ios 經緯度

       進行中的項目中有這樣的需求：定位獲得當前經緯度，再用百度Place API使用經緯度查詢周邊資訊。這裡不需要顯示地圖，只需要定位。看似思路很順暢，做起來卻不容易。

      iPhone的GPS定位(CLLocationManager)獲得的經緯座標是基於WGS-84座標系（世界標準），Google地圖使用的是GCJ-02座標系（中國特色的火星座標系），這就是為什麼獲得的經緯座標在google地圖上會發生位移。我項目需求是使用百度Place API，百度的經緯座標在GCJ-02的基礎上再做了次加密，就是DB-09座標系。就想使用百度地圖的IOS SDK，裡面的座標系統都是一致的而不用轉換，由於不想讓項目太大，所以沒有用百度的sdk，所以另闢蹊徑了。

       在網上搜尋一番，有現成百度的介面轉換座標，經實驗 從WGS-84到GCJ-02，再到DB-09，經兩次轉換後，順利獲得當前正確地理位置資訊和周邊資訊，當然這些資訊是來自百度的。

ZYLocationManager.h

#import <Foundation/Foundation.h>#import <CoreLocation/CoreLocation.h>#import "Singleton.h"typedef void(^locationBlock)(CLLocationCoordinate2D coor);typedef void(^addressBlock)(NSString *address);@interface ZYLocationManager : NSObjectsingleton_interface(ZYLocationManager)/** *  擷取糾偏後的經緯度(百度地圖經緯度) */- (void) getLocationCoordinate:(locationBlock) locaiontBlock;/** *  擷取糾偏後的經緯度(百度地圖經緯度)和地址 */- (void) getLocationCoordinate:(locationBlock) locaiontBlock address:(addressBlock) addressBlock;@end

ZYLocationManager.m

#import "ZYLocationManager.h"#import "AFNetworking.h"#define IOS_Version [[UIDevice currentDevice].systemVersion floatValue]@interface ZYLocationManager ()<CLLocationManagerDelegate>{// 儲存block    locationBlock _locationBlock;    addressBlock _addressBlock;}@property (nonatomic, strong) CLLocationManager *lm;@end@implementation ZYLocationManagersingleton_implementation(ZYLocationManager)/** *  懶載入 */- (CLLocationManager *)lm{    if (!_lm) {        _lm = [[CLLocationManager alloc] init];        _lm.delegate = self;        // 定位精準度        _lm.desiredAccuracy = kCLLocationAccuracyBest;        // 重新置放的距離        _lm.distanceFilter = 1000.0f;    }    return _lm;}/** *  類第一次使用的時候被調用 */+ (void)initialize{    ZYLocationManager *manager = [self sharedZYLocationManager];    // ios8後需要向使用者請求許可權    if (IOS_Version >= 8.0) {        [manager.lm requestWhenInUseAuthorization];        [manager.lm requestAlwaysAuthorization];    }    // 開始定位    [manager.lm startUpdatingLocation];}#pragma mark - CLLocationManager擷取經緯度的代理方法- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{    CLLocation *location = [locations lastObject];    CLLocationCoordinate2D coor = location.coordinate;//    NSLog(@"緯度：%.6f 經度%.6f", coor.latitude, coor.longitude);    NSString *x1 = [NSString stringWithFormat:@"%f", coor.longitude];    NSString *y1 = [NSString stringWithFormat:@"%f", coor.latitude];    // http://api.map.baidu.com/ag/coord/convert?from=0&to=2&x=113.377346&y=23.132648    __block NSDictionary *dict1 = @{@"from":@"0",                            @"to":@"2",                            @"x":x1,                            @"y":y1                            };    AFHTTPRequestOperationManager *roManager = [AFHTTPRequestOperationManager manager];    // 1、ios系統經緯度（國際標準）轉Google經緯度    [roManager GET:@"http://api.map.baidu.com/ag/coord/convert" parameters:dict1 success:^(AFHTTPRequestOperation *operation, id responseObject) {        __block NSString *resultX = [self base64Decode:responseObject[@"x"]];        __block NSString *resultY = [self base64Decode:responseObject[@"y"]];        dict1 = @{@"from":@"2",                  @"to":@"4",                  @"x":resultX,                  @"y":resultY                  };                // 2、Google經緯度轉百度經緯度        [roManager GET:@"http://api.map.baidu.com/ag/coord/convert" parameters:dict1 success:^(AFHTTPRequestOperation *operation, id responseObject) {            resultX = [self base64Decode:responseObject[@"x"]];            resultY = [self base64Decode:responseObject[@"y"]];            CLLocationCoordinate2D resultCoor = CLLocationCoordinate2DMake([resultY floatValue], [resultX floatValue]);            // 給block賦值            if (_locationBlock) {                _locationBlock(resultCoor);            }            [self getAddressWithCoordinate:resultCoor];        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {            NSLog(@"%@", error);        }];    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {        NSLog(@"%@", error);    }];        // 停止定位    [self.lm stopUpdatingLocation];}- (void)getLocationCoordinate:(locationBlock)locaiontBlock{    _locationBlock = locaiontBlock;}- (void)getLocationCoordinate:(locationBlock)locaiontBlock address:(addressBlock)addressBlock{    _locationBlock = locaiontBlock;    _addressBlock = addressBlock;}#pragma mark - base64解密- (NSString *)base64Decode:(NSString *)str{    // 1、加密字串轉位元據    NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];    // 2、位元據轉字串    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];}#pragma mark - 經緯度轉地址- (void)getAddressWithCoordinate:(CLLocationCoordinate2D)coor{    if (coor.latitude == 0 || coor.longitude == 0) return;        CLLocation *loca = [[CLLocation alloc] initWithLatitude:coor.latitude longitude:coor.longitude];    CLGeocoder *geocoder = [[CLGeocoder alloc] init];    [geocoder reverseGeocodeLocation:loca completionHandler:^(NSArray *placemarks, NSError *error) {        if (placemarks.count == 0 || error) return;                CLPlacemark *pm = [placemarks lastObject];        if (_addressBlock) {            _addressBlock(pm.thoroughfare);        }    }];}@end

IOS8後，請求定位需要請求許可權，代碼ZYLocationManager.m已經寫好了，不過還需要在info.plist中，添加兩個屬性NSLocationAlwaysUsageDescription和NSLocationWhenInUseUsageDescription，屬性值即是你需要提示給使用者的資訊，如所示：

        將ZYLocationManager.h和ZYLocationManager.m拖入項目中，即可直接調用ZYLocationManager.h定義的兩個方法，擷取到百度經緯度和地址。

ios系統經緯度轉百度經緯度及經緯度轉地址