iOS系统自带定位，用CLLocationManager就可以轻松的实现定位的操作，获得的是一组经纬度，当然，也可以根据给出的经纬度获取相应的省份、城市、街道等信息，下面就看一个根据经纬度获得城市的demo：
因为获取经纬度需要CLLocationManager类，而这个类包含在CoreLocation框架中，获取城市信息需要mapKit框架，所以需要首先在工程中导入这两个框架：
导入框架的步骤：选择1.target——2.Build Phases——3.Link Binary With Libraries ——4.点击“+”号：如图所示步骤：
点击加号之后在搜索框里输入相应的框架，即可搜索到，如图所示：
下面就该写代码了，首先在视图控制器中导入：
#import<CoreLocation/CoreLocation.h>#import<MapKit/MapKit.h>
两个头文件，然后.m中的具体代码如下：
#import"ANNViewController.h"@interfaceANNViewController()@property(strong,nonatomic)IBOutletUILabel*longitude;@property(strong,nonatomic)IBOutletUILabel*latitude;@property(strong,nonatomic)IBOutletUILabel*location;@property(strong,nonatomic)CLLocationManager*locationManager;@end@implementationANNViewController-(void)viewDidLoad{[superviewDidLoad];//Doanyadditionalsetupafterloadingtheview,typicallyfromanib.self.view.backgroundColor=[UIColorwhiteColor];//创建CLLocationManager对象self.locationManager=[[CLLocationManageralloc]init];//设置代理为自己self.locationManager.delegate=self;}-(IBAction)locationButton:(UIButton*)sender{[self.locationManagerstartUpdatingLocation];}-(void)locationManager:(CLLocationManager*)managerdidUpdateToLocation:(CLLocation*)newLocationfromLocation:(CLLocation*)oldLocation{//将经度显示到label上self.longitude.text=[NSStringstringWithFormat:@"%lf",newLocation.coordinate.longitude];//将纬度现实到label上self.latitude.text=[NSStringstringWithFormat:@"%lf",newLocation.coordinate.latitude];//获取当前所在的城市名CLGeocoder*geocoder=[[CLGeocoderalloc]init];//根据经纬度反向地理编译出地址信息[geocoderreverseGeocodeLocation:newLocationcompletionHandler:^(NSArray*array,NSError*error){if(array.count>0){CLPlacemark*placemark=[arrayobjectAtIndex:0];//将获得的所有信息显示到label上self.location.text=placemark.name;//获取城市NSString*city=placemark.locality;if(!city){//四大直辖市的城市信息无法通过locality获得，只能通过获取省份的方法来获得（如果city为空，则可知为直辖市）city=placemark.administrativeArea;}NSLog(@"city=%@",city);}elseif(error==nil&&[arraycount]==0){NSLog(@"Noresultswerereturned.");}elseif(error!=nil){NSLog(@"Anerroroccurred=%@",error);}}];//系统会一直更新数据，直到选择停止更新，因为我们只需要获得一次经纬度即可，所以获取之后就停止更新[managerstopUpdatingLocation];}
主要就是直辖市的城市获得需要拐个弯，iOS7添加了一个新的方法，代替了上面这个方法：
-(void)locationManager:(CLLocationManager*)managerdidUpdateLocations:(NSArray*)locations{NSLog(@"longitude=%f",((CLLocation*)[locationslastObject]).coordinate.longitude);NSLog(@"latitude=%f",((CLLocation*)[locationslastObject]).coordinate.latitude);[managerstopUpdatingLocation];}
后面的处理和上面的方法一样，大家可以看一下。
另外还有一些CLGeocoder的属性如下：
@property(nonatomic,readonly)NSDictionary*addressDictionary;//addressdictionaryproperties@property(nonatomic,readonly)NSString*name;//eg.AppleInc.@property(nonatomic,readonly)NSString*thoroughfare;//streetaddress,eg.1InfiniteLoop@property(nonatomic,readonly)NSString*subThoroughfare;//eg.1@property(nonatomic,readonly)NSString*locality;//city,eg.Cupertino@property(nonatomic,readonly)NSString*subLocality;//neighborhood,commonname,eg.MissionDistrict@property(nonatomic,readonly)NSString*administrativeArea;//state,eg.CA@property(nonatomic,readonly)NSString*subAdministrativeArea;//county,eg.SantaClara@property(nonatomic,readonly)NSString*postalCode;//zipcode,eg.95014@property(nonatomic,readonly)NSString*ISOcountryCode;//eg.US@property(nonatomic,readonly)NSString*country;//eg.UnitedStates@property(nonatomic,readonly)NSString*inlandWater;//eg.LakeTahoe@property(nonatomic,readonly)NSString*ocean;//eg.PacificOcean@property(nonatomic,readonly)NSArray*areasOfInterest;//eg.GoldenGatePark
完整的工程如下：
附件下载地址：/winann/TestLocation.git
