OC----GPS Positioning

2. Create a new empty project first 2. Building a rootviewcontroller of succession and Uiviewcontroller
   

4. The code is as follows:
   

6. //set root view manager-  (BOOL) application: (uiapplication  *) Application didfinishlaunchingwithoptions: (nsdictionary *) launchoptions {     self.window = [[uiwindow alloc] initwithframe:[[uiscreen mainscreen]  bounds]];        rootviewcontroller *rvc = [[ rootviewcontroller alloc] init];    uinavigationcontroller *nav =  [[UINavigationController alloc] initWithRootViewController:rvc];     self.window.rootviewcontroller = nav;         self.window.backgroundcolor = [uicolor whitecolor];    [self.window  Makekeyandvisible];    return yes;} 

9. #import   "RootViewController.h" #import  <CoreLocation/CoreLocation.h> #define  path @ " Http://api.map.baidu.com/geocoder?output=json&location=%f,%f&key=dc40f705157725fc98f1fee6a15b6e60 "@ interface rootviewcontroller  () <CLLocationManagerDelegate>{    //lbs  Location management     cllocationmanager *_manager;} @property   (nonatomic,strong) cllocationmanager *manager; @end @implementation rootviewcontroller-   (void) viewdidload {    [super viewdidload];     self.navigationitem.leftbarbuttonitem = [[uibarbuttonitem alloc] initwithtitle:@ "Start positioning"  style:uibarbuttonitemstyleplain target:self action: @selector (beginelocation)];     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]  initwithtitle:@ "Stop positioning"  style:uibarbuttonitemstyleplain target:self action: @seLector (endlocation)];        //Create manager     [self  initlocationmanager];} /* kcllocationaccuracybestfornavigation //accuracy of  kcllocationaccuracybest;//when navigating with high accuracy   kcllocationaccuracynearesttenmeters; 10m in  kCLLocationAccuracyHundredMeters;100m  kcllocationaccuracykilometer;1000m kcllocationaccuracythreekilometers; 3000m */-  (void) initlocationmanager {    //Lazy Load     if  (!self.manager)  {         //instantiating a Management object          self.manager = [[cllocationmanager alloc] init];         //setting accuracy   accuracy the higher the power consumption         self.manager.desiredaccuracy =  kcllocationaccuracybestfornavigation;        //Precision Size  1m         self.manager.distancefilter = 1;                 /*          After iOS8   need to set up configuration file                    1. Adding   Privacy - Location Usage Description  in Info.plist  ,  nslocationalwaysusagedescription         2. In the Code   [_manager requestAlwaysAuthorization];          //ios8 unique, requesting user authorization to use geo-location information                   */        cgfloat version = [[[ uidevice currentdevice] systemversion] floatvalue];         //Judge version         if  (version >= 8.0)  {             //requesting user authorization to use geo-location information              //authorization the meaning of the authorization              [self.manager requestalwaysauthorization];        }         //if you want to   get location   then you need to set the proxy          self.manager.delegate = self;    }}-  (void) beginelocation  {    //Support for Location Services     if  ([cllocationmanager  Locationservicesenabled])  {        //start positioning          [self.manager startUpdatingLocation];    }else{          NSLog (@ "no GPs"),     }}//stop positioning-  (void) endlocation {    [ Self.manager stopupdatinglocation];} #pragma  mark - cllocationmanagerdelegate protocol//When positioning starts   position changes   will always call//will position the location   put  locations array//This array actually has only one element-  (void) Locationmanager: (cllocationmanager *) manager  Didupdatelocations: (nsarray *) Locations {    nslog (@ "anchor position");     if  (Locations.count) There is only one element in the  {        //array          CLLocation *location = [locations lastObject];         //cllocationcoordinate2d is a structure   internal storage is latitude and longitude          CLLocationCoordinate2D coordinate = location.coordinate;         nslog (@ "longitude:%f", coordinate.longitude);    &nbsP;    nslog (@ "latitude:%f", Coordinate.latitude);          #if  1        //'s official own geo-coding          CLGeocoder *geoCoder = [[CLGeocoder alloc] init];         //geo-coding    geo-coding   (converting latitude to true address location)          [geocoder reversegeocodelocation:location completionhandler:^ (NSArray * Placemarks, nserror *error)  {             //callback This block            //will be put in   after parsing well placemarks  Array (actually an element)             for  (Clplacemark *mark in placemarks)  {                  nslog (@ "name->%@", Mark.name);                 nslog (@ "country:%@", Mark.country);                 for  (nsstring *key in  Mark.addressdictionary)  {                     nslog (@ "%@", Mark.addressdictionary[key]);                 }             }        }];          #else         //Asynchronous Download data   use Baidu's geo-coding         dispatch_async (Dispatch_get_global_queue (DISPATCH_QUEUE_ priority_default, 0),  ^{            nsstring *url = [nsstring  stringwithformat:path,coordinate.latitude, coordinate.longitude];             nsdata *data = [nsdata datawithcontentsofurl:[nsurl  urlwithstring:url]];            //Download Complete              nsdictionary *dict = [ nsjsonserialization jsonobjectwithdata:data options:nsjsonreadingmutablecontainers error:nil];             NSDictionary *result =  dict[@ "Result"];            nslog (@ "addr:%@", result[@ "Formatted_address"]);                     }); #endif             }}/* {  "status": "OK",   "Result":{  "location":{  "LNG":113.675911,  "lat":34.772749 },  "formatted_address ":" Zhengzhou Jinshui District, Henan Province, eight 26th ", " Business ":" Sheng Gang, by eight, gold waterway ", " Addresscomponent ":{ " City ":" Zhengzhou ", " Direction ":" Near ", " Distance ":" ", " District ":" Jinshui ", " province ":" Henan Province ", " Street ":" By Eight ",   "Street_number": "Number 26th"  },  "Citycode":268 } } */-  (void) Locationmanager: ( cllocationmanager *) Manager didfailwitherror: (nserror *) error {     NSLog (@ "failed to locate");} -  (void) didreceivememorywarning {    [super didreceivememorywarning];     // dispose of any resources that can be recreated.} @end

OC----GPS positioning