ios系统经纬度转百度经纬度及经纬度转地址

版权声明:本文为博主原创文章,未经博主允许不得转载。

   正在进行的项目中有这样的需求:定位获得当前经纬度,再用百度Place API使用经纬度查询周边信息。这里不需要显示地图,只需要定位。看似思路很顺畅,做起来却不容易。
  iPhone的GPS定位(CLLocationManager)获得的经纬坐标是基于WGS-84坐标系(世界标准),Google地图使用的是GCJ-02坐标系(中国特色的火星坐标系),这就是为什么获得的经纬坐标在google地图上会发生偏移。我项目需求是使用百度Place API,百度的经纬坐标在GCJ-02的基础上再做了次加密,就是DB-09坐标系。就想使用百度地图的[iOS](http://lib.csdn.net/base/ios) SDK,里面的坐标系统都是一致的而不用转换,由于不想让项目太大,所以没有用百度的sdk,所以另辟蹊径了。
   在网上搜索一番,有现成百度的接口转换坐标,经试验 从WGS-84到GCJ-02,再到DB-09,经两次转换后,顺利获得当前正确地理位置信息和周边信息,当然这些信息是来自百度的。

ZYLocationManager.h

[objc] view plain copy

import <Foundation/Foundation.h>

import <CoreLocation/CoreLocation.h>

import "Singleton.h"

typedef void(^locationBlock)(CLLocationCoordinate2D coor);
typedef void(^addressBlock)(NSString *address);

@interface ZYLocationManager : NSObject
singleton_interface(ZYLocationManager)

/**

  • 获取纠偏后的经纬度(百度地图经纬度)
    */
  • (void) getLocationCoordinate:(locationBlock) locaiontBlock;

/**

  • 获取纠偏后的经纬度(百度地图经纬度)和地址
    */
  • (void) getLocationCoordinate:(locationBlock) locaiontBlock address:(addressBlock) addressBlock;

@end

ZYLocationManager.m

[objc] view plain copy

import "ZYLocationManager.h"

import "AFNetworking.h"

define IOS_Version [[UIDevice currentDevice].systemVersion floatValue]

@interface ZYLocationManager ()<CLLocationManagerDelegate>{
// 保存block
locationBlock _locationBlock;
addressBlock _addressBlock;
}

@property (nonatomic, strong) CLLocationManager *lm;

@end

@implementation ZYLocationManager
singleton_implementation(ZYLocationManager)

/**

  • 懒加载
    */
  • (CLLocationManager *)lm
    {
    if (!_lm) {
    _lm = [[CLLocationManager alloc] init];
    _lm.delegate = self;
    // 定位精准度
    _lm.desiredAccuracy = kCLLocationAccuracyBest;
    // 重新定位的距离
    _lm.distanceFilter = 1000.0f;
    }
    return _lm;
    }

/**

  • 类第一次使用的时候被调用
    */
  • (void)initialize
    {
    ZYLocationManager *manager = [self sharedZYLocationManager];
    // ios8后需要向用户请求权限
    if (IOS_Version >= 8.0) {
    [manager.lm requestWhenInUseAuthorization];
    [manager.lm requestAlwaysAuthorization];
    }
    // 开始定位
    [manager.lm startUpdatingLocation];
    }

pragma mark - CLLocationManager获取经纬度的代理方法

  • (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
    {
    CLLocation *location = [locations lastObject];
    CLLocationCoordinate2D coor = location.coordinate;
    // NSLog(@"纬度:%.6f 经度%.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系统经纬度(国际标准)转谷歌经纬度
    [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、谷歌经纬度转百度经纬度  
      [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]);  
          // 给block赋值  
          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、加密字符串转二进制数据
    NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    // 2、二进制数据转字符串
    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    }

pragma mark - 经纬度转地址

  • (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后,请求定位需要请求权限,代码ZYLocationManager.m已经写好了,不过还需要在info.plist中,添加两个属性NSLocationAlwaysUsageDescription和NSLocationWhenInUseUsageDescription,属性值即是你需要提示给用户的信息,如下图所示:

将ZYLocationManager.h和ZYLocationManager.m拖入项目中,即可直接调用ZYLocationManager.h定义的两个方法,获取到百度经纬度和地址。

原文出处: http://blog.csdn.net/u013454067/article/details/45131387

推荐阅读更多精彩内容