iOS development: Get City, province and other information through latitude and longitude

iOS system with the positioning, with Cllocationmanager can easily achieve the positioning of the operation, obtained is a set of latitude and longitude, of course, you can also obtain the corresponding provinces, cities, streets and other information according to the latitude and longitude, the following look at a city according to latitude and longitude of the demo:

Because the Cllocationmanager class is required to obtain the latitude and longitude, and this class is contained in the Corelocation framework, obtaining the city information requires a Mapkit framework, so you need to first import the two frameworks into the project:

To import a frame: Select 1.target--2.build phases--3.link Binary with libraries--4. Click on the "+" sign: Step:
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After clicking the plus sign, enter the appropriate frame in the search box to search:

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The following is the code to write, first in the View controller import:

#import <CoreLocation/CoreLocation.h> #import <MapKit/MapKit.h>

Two header files, and then the specific code in. m is as follows:

#import   "ANNViewController.h" @interface  ANNViewController  () @property   (strong,  nonatomic)  IBOutlet UILabel *longitude; @property   (strong, nonatomic)  iboutlet  UILabel *latitude; @property   (strong, nonatomic)  iboutlet uilabel *location ; @property   (strong, nonatomic)  CLLocationManager *locationManager; @end @implementation  ANNViewController-  (void) viewdidload{    [super viewdidload];// do  any additional setup after loading the view, typically from  a nib.    self.view.backgroundColor = [UIColor whiteColor];         //Creating Cllocationmanager Objects      self.locationmanager = [[cllocationmanager alloc] init];    //set proxy for yourself     self.locationmanager.delegate = self;    }-  (ibaction) Locationbutton: (uibutton *) sender {     [self.locationmanager startupdatinglocation];} -  (void) Locationmanager: (cllocationmanager *) Managerdidupdatetolocation: (cllocation *) Newlocation   fromlocation: (cllocation *) oldlocation{         //display longitude on label     self.longitude.text = [NSString  stringwithformat:@ "%lf",  newlocation.coordinate.longitude];    //latitude reality to label      self.latitude.text = [nsstring stringwithformat:@ "%LF",  newlocation.coordinate.latitude];        //  Get your current city name      CLGeocoder *geocoder = [[CLGeocoder alloc] init];     //the address information according to the latitude and longitude of the reverse geo-compilation     [geocoder reversegeocodelocation:newlocation completionhandler:^ (Nsarray *array, nserror *error)      {          if  (array.count > 0)           {              clplacemark *placemark = [array objectatindex:0];                            //all the information you get is displayed on the label               self.location.text = placemark.name;              //get the city              nsstring  *city = placemark.locality;              if  (!ciTY)  {                 The city information of  //Four municipalities cannot be obtained by locality, but only by obtaining the province's method (if it is empty, it is known as the municipality)                   city = placemark.administrativeArea;              }              nslog (@ "city = %@",  city);                        }         else if  (error == nil  && [array count] == 0)          {              nslog (@ "No results  were returned. ");   &nbSp;      }         else if   (Error != nil)          {              nslog (@ "an error occurred = %@",  error);         }     }];  The        //system will keep updating the data until you choose to stop the update, because we just need to get a latitude and longitude, so get it and stop the update      [manager stopupdatinglocation];}

The main city of municipalities to obtain the need to turn a corner, IOS7 added a new method, instead of the above method:

-(void) Locationmanager: (Cllocationmanager *) Manager didupdatelocations: (Nsarray *) locations{NSLog (@ "longitude =%f"    , ((Cllocation *) [Locationslastobject]). Coordinate.longitude);        NSLog (@ "latitude =%f", ((Cllocation *) [Locations Lastobject]). Coordinate.latitude); [Manager stopupdatinglocation];}

After the treatment and the above method, we can look at.

There are also some Clgeocoder properties as follows:

@property   (nonatomic, readonly)  NSDictionary *addressDictionary;// address  dictionary properties@property  (nonatomic, readonly)  nsstring *name; // eg.  apple inc. @property   (nonatomic, readonly)  NSString *thoroughfare; //  street address, eg. 1 infinite loop@property  (nonatomic, readonly)   nsstring *subthoroughfare; // eg. 1@property  (nonatomic, readonly)  NSString  *locality; // city, eg. Cupertino@property  (nonatomic, readonly)   nsstring *sublocality; // neighborhood, common name, eg. mission  district@property  (nonatomic, readonly)  nsstring *administrativearea; // state,  eg. CA@property  (nonatomic, readonly)  nsstring *subadministrativearea; //  county, eg. santa clara@property  (nonatomic, readonly)  nsstring *postalcode; // zip  code, eg. 95014@property  (nonatomic, readonly)  NSString *ISOcountryCode;  // eg. US@property  (nonatomic, readonly)  NSString *country; //  eg. united states@property  (nonatomic, readonly)  nsstring *inlandwater; //  eg. Lake Tahoe@property  (nonatomic, readonly)  nsstring *ocean; //  eg. Pacific Ocean@property  (nonatomic, readonly)  NSArray *areasOfInterest;  // eg. golden gate park

The complete project is as follows:

Accessories: Https://github.com/winann/TestLocation.git

This article is from the "A Mao" blog, please be sure to keep this source http://winann.blog.51cto.com/4424329/1532528