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   正在進(jìn)行的項(xiàng)目中有這樣的需求：定位獲得當(dāng)前經(jīng)緯度，再用百度Place API使用經(jīng)緯度查詢周邊信息。這里不需要顯示地圖，只需要定位跌穗。看似思路很順暢虏辫，做起來(lái)卻不容易蚌吸。
  iPhone的GPS定位(CLLocationManager)獲得的經(jīng)緯坐標(biāo)是基于WGS-84坐標(biāo)系（世界標(biāo)準(zhǔn)），Google地圖使用的是GCJ-02坐標(biāo)系（中國(guó)特色的火星坐標(biāo)系）砌庄，這就是為什么獲得的經(jīng)緯坐標(biāo)在google地圖上會(huì)發(fā)生偏移羹唠。我項(xiàng)目需求是使用百度Place API，百度的經(jīng)緯坐標(biāo)在GCJ-02的基礎(chǔ)上再做了次加密娄昆，就是DB-09坐標(biāo)系佩微。就想使用百度地圖的[iOS](http://lib.csdn.net/base/ios) SDK，里面的坐標(biāo)系統(tǒng)都是一致的而不用轉(zhuǎn)換萌焰，由于不想讓項(xiàng)目太大哺眯，所以沒(méi)有用百度的sdk，所以另辟蹊徑了扒俯。
   在網(wǎng)上搜索一番奶卓，有現(xiàn)成百度的接口轉(zhuǎn)換坐標(biāo)，經(jīng)試驗(yàn) 從WGS-84到GCJ-02撼玄，再到DB-09夺姑，經(jīng)兩次轉(zhuǎn)換后，順利獲得當(dāng)前正確地理位置信息和周邊信息掌猛，當(dāng)然這些信息是來(lái)自百度的盏浙。

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)

/**

• 獲取糾偏后的經(jīng)緯度(百度地圖經(jīng)緯度)
  */

• (void) getLocationCoordinate:(locationBlock) locaiontBlock;

/**

• 獲取糾偏后的經(jīng)緯度(百度地圖經(jīng)緯度)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)

/**

• 懶加載
  */

• (CLLocationManager *)lm
  {
  if (!_lm) {
  _lm = [[CLLocationManager alloc] init];
  _lm.delegate = self;
  // 定位精準(zhǔn)度
  _lm.desiredAccuracy = kCLLocationAccuracyBest;
  // 重新定位的距離
  _lm.distanceFilter = 1000.0f;
  }
  return _lm;
  }

/**

• 類第一次使用的時(shí)候被調(diào)用
  */

• (void)initialize
  {
  ZYLocationManager *manager = [self sharedZYLocationManager];
  // ios8后需要向用戶請(qǐng)求權(quán)限
  if (IOS_Version >= 8.0) {
  [manager.lm requestWhenInUseAuthorization];
  [manager.lm requestAlwaysAuthorization];
  }
  // 開始定位
  [manager.lm startUpdatingLocation];
  }

pragma mark - CLLocationManager獲取經(jīng)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(jīng)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(tǒng)經(jīng)緯度（國(guó)際標(biāo)準(zhǔn)）轉(zhuǎn)谷歌經(jīng)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荔茬、谷歌經(jīng)緯度轉(zhuǎn)百度經(jīng)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废膘、加密字符串轉(zhuǎn)二進(jìn)制數(shù)據(jù)
  NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
  // 2、二進(jìn)制數(shù)據(jù)轉(zhuǎn)字符串
  return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  }

pragma mark - 經(jīng)緯度轉(zhuǎn)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

將ZYLocationManager.h和ZYLocationManager.m拖入項(xiàng)目中十偶，即可直接調(diào)用ZYLocationManager.h定義的兩個(gè)方法菩鲜，獲取到百度經(jīng)緯度和地址。

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