ios平台gps简单应用（获取经纬度、获取详细地址）

这个是不带view继承的使用方法，网上大部分都是在view的基础上使用。其实就是用NSObject代替相关view。

需要注意的是返回的placemark里有可能有null值的，使用之前要进行非空检测。

直接上代码：

//GpsInfo.h

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

//GpsInfo.mm

#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