iOS 实时定位功能

<pre name="code" class="objc">using namespace std;  #import <CoreLocation/CoreLocation.h>  #import <MapKit/MapKit.h>    @class CLLocationManager;  @class MKReverseGeocoder;  @interface GpsInfo: NSObject<MKReverseGeocoderDelegate, CLLocationManagerDelegate> {    @private      CLLocationManager* locationMgr;      MKReverseGeocoder* reverseGeocoder;// iso 5.0以下SDK版本使用      //CLGeocoder* clGeocoder;// iso 5.0及5.0以上SDK版本使用  }    @property (nonatomic, retain) CLLocationManager* locationMgr;  @property (nonatomic, retain) MKReverseGeocoder* reverseGeocoder;  //@property (nonatomic, retain) CLGeocoder* clGeocoder;// iso 5.0及5.0以上SDK版本使用      // location detect  - (void)UpdateLocationLatLng;    @end  

<pre name="code" class="objc">#import "GpsInfo.h"  using namespace std;// this line is to fix "isinf" was not declared in this scop problem  #import <MapKit/MapKit.h>  #import <CoreLocation/CoreLocation.h>  #import "Util.h"  @implementation GpsInfo      @synthesize locationMgr;  @synthesize reverseGeocoder;  //@synthesize clGeocoder;    - (id)init  {      self = [super init];      if (self) {      locationMgr = nil;          reverseGeocoder = nil;          [self UpdateLocationLatLng];      }      return self;  }    - (void)dealloc {      [locationMgr release];      locationMgr = nil;      [reverseGeocoder release]      reverseGeocoder = nil;      //[clGeocoder release];      //clGeocoder = nil;      [super dealloc];  }    -(void)UpdateLocationLatLng  {      if (locationMgr == nil)      {          locationMgr = [[CLLocationManager alloc] init];          locationMgr.delegate = self;          locationMgr.desiredAccuracy = kCLLocationAccuracyBest;      }            [locationMgr startUpdatingLocation];  }    #pragma mark - get Placemark  // iso 5.0以下SDK使用  - (void)startedReverseGeoderWithLatitude: (double)latitude longitude: (double)longitude {      CLLocationCoordinate2D coordinate2D;      coordinate2D.latitude = latitude;      coordinate2D.longitude = longitude;            if (reverseGeocoder == nil)      {          reverseGeocoder = [MKReverseGeocoder alloc];      }      reverseGeocoder = [reverseGeocoder initWithCoordinate:coordinate2D];                  reverseGeocoder.delegate = self;      [reverseGeocoder start];  }    - (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error  {      NSLog(@"Geocoder error!");  }    - (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark  {      NSLog(@"GPS Info: country:%@, locality:%@, subLocality:%@, thoroughfare:%@, subThoroughfare:%@",            placemark.country, placemark.locality, placemark.subLocality, placemark.thoroughfare, placemark.subThoroughfare);            if (m_gpsInfoLocal != nil)      {          if (placemark.country != nil)              {};          else              {};          if (placemark.locality != nil)              {};          else              {};          if (placemark.subLocality != nil)              {};          else              {};          if (placemark.thoroughfare != nil)              {};          else              {};          if (placemark.subThoroughfare != nil)              {};          else              {};      }  }  /*   ! This project use DeploymentTarget for 4.3  // iso 5.0及5.0以上SDK版本使用  - (void)locationAddressWithCLLocation:(CLLocation*)locationGps  {      if (self.clGeocoder == nil)      self.clGeocoder = [[CLGeocoder alloc] init];            [self.clGeocoder reverseGeocodeLocation:locationGps completionHandler:^(NSArray* placemarks, NSError* error)      {          MKPlacemark* placemark = [placemarks objectAtIndex:0];      }];  }  */  #pragma mark - location Delegate  - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error  {      NSLog(@"Location error!");  }    // iso 5.0及5.0以下SDK使用  -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation  {      if (!newLocation) {          [self locationManager:manager didFailWithError:NULL];          return;      }      /*       ! signbit 需要引入库framework libSystem.B.dylib，暂时注掉。      // horizontalAccuracy，用来得到水平上的精确度，它的大小就是定位精度的半径，单位为米。如果值为－1，则说明此定位不可信。      if (signbit(newLocation.horizontalAccuracy)) {          [self locationManager:manager didFailWithError:NULL];          return;      }       */            [manager stopUpdatingLocation];// 用完就停，减少耗电            NSLog(@"current location: %f, %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);                // 解析坐标获得城市信息      /*这个项目使用4.3的SDK      if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 5.0) {          [self locationAddressWithCLLocation:newLocation];      } else {          [self startedReverseGeoderWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude];      }       */      [self startedReverseGeoderWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude];  }      @end