iOS Development extension Chapter-corelocation geocoding

A simple explanation

Clgeocoder: Geo Encoder, where Geo is a shorthand for geographic English word geography.

1. Use Clgeocoder to complete the geocoding and anti-geocoding

　　geocoding : Obtain specific location information (such as latitude and longitude, full name of address, etc.) based on a given place name

anti-geocoding : Obtain specific location information based on a given latitude and longitude

(1) Geocoding methods

-(void) geocodeaddressstring: (NSString *) addressstring Completionhandler: (Clgeocodecompletionhandler) Completionhandler;

(2) Anti-geo-coding method

-(void) Reversegeocodelocation: (cllocation *) location Completionhandler: (Clgeocodecompletionhandler) Completionhandler;

2.CLGeocodeCompletionHandler

When Geo-geocoding is complete, the Clgeocodecompletionhandler is called

　　

This block passes 2 parameters

　　　　Error : There is a value when the encoding is wrong (for example, no specific information is encoded)

　　　　placemarks : It contains Clplacemark objects.

3.CLPlacemark

Description: Clplacemark literally means landmark, encapsulating detailed address location information

Geographical location @property (nonatomic, readonly) cllocation *location;

Regional @property (nonatomic, readonly) clregion *region;

Detailed address information @property (nonatomic, readonly) nsdictionary *addressdictionary;

Address name @property (nonatomic, readonly) NSString *name;

City @property (nonatomic, readonly) NSString *locality;

Second, the code example:

The interface in storyboard is as follows:

　　

Implementation code:

VIEWCONTROLLER.M file

1 //2 //YYVIEWCONTROLLER.M3 //geo-coding4 //5 //Created by Xiaozeng on 14-8-11.6 //Copyright (c) 2014 GitHub. All rights reserved.7 //8 9 #import "ViewController.h"Ten #import<CoreLocation/CoreLocation.h> One  A @interfaceViewcontroller () -@property (nonatomic,strong) Clgeocoder *Geocoder; - #pragmamark-geocoding the-(ibaction) GeoCode; -@property (Weak, nonatomic) Iboutlet Uitextfield *Addressfield; -@property (Weak, nonatomic) Iboutlet UILabel *Longitudelabel; -@property (Weak, nonatomic) Iboutlet UILabel *Latitudelabel; +@property (Weak, nonatomic) Iboutlet UILabel *Detailaddresslabel; -  + #pragmamark-Anti-geo-coding A  at-(ibaction) Reversegeocode; -@property (Weak, nonatomic) Iboutlet Uitextfield *Longitudefield; -@property (Weak, nonatomic) Iboutlet Uitextfield *Latitudefield; -@property (Weak, nonatomic) Iboutlet UILabel *Reverdedetailaddresslabel; - @end -  in @implementationYyviewcontroller -  to #pragmamark-Lazy Loading +-(Clgeocoder *) Geocoder - { the     if(_geocoder = =Nil) { *_geocoder =[[Clgeocoder alloc] init]; $     }Panax Notoginseng     return_geocoder; - } the- (void) Viewdidload + { A [Super Viewdidload]; the } + /** - * geo-coding: Geographical Names--latitude and longitude coordinates $  */ $-(ibaction) GeoCode { -     // 1. Get the address you entered -NSString *address =Self.addressField.text; the     if(Address.length = =0)return; -     Wuyi     // 2. Start geocoding the     // Description: Call the following method to start coding, regardless of whether the encoding succeeds or fails, calls the method in block -[Self.geocoder geocodeaddressstring:address completionhandler:^ (Nsarray *placemarks, NSError *error) { Wu         // If there is an error message, or if the number of place-name elements obtained in the array is 0, then the description is not found -         if(Error | | placemarks.count = =0) { Aboutself.detailaddresslabel.text=@"the address you entered was not found, possibly on the moon."; $}Else   //The coding was successful and the location information was found. -         { -             // Print to see all the location information found -                 /* A Name: Names + locality: City the Country: Country - postalCode: Zip code $                  */ the              for(Clplacemark *placemarkinchplacemarks) { theNSLog (@"name=%@ locality=%@ country=%@ postalcode=%@", Placemark.name, placemark.locality, Placemark.country, placemark.postalcode); the             } the              -             // Remove the first of the obtained geo-information array displayed on the interface inClplacemark *firstplacemark =[Placemarks firstobject]; the             // Detailed address name theSelf.detailAddressLabel.text =Firstplacemark.name; About             // Latitude theCllocationdegrees latitude =FirstPlacemark.location.coordinate.latitude; the             // Longitude theCllocationdegrees longitude =FirstPlacemark.location.coordinate.longitude; +Self.latitudeLabel.text = [NSString stringWithFormat:@"%.2f", latitude]; -Self.longitudeLabel.text = [NSString stringWithFormat:@"%.2f", longitude]; the         }Bayi     }]; the } the  - /** - * Anti-geocoding: Geographical Names by latitude and longitude coordinates the  */ the-(ibaction) Reversegeocode { the     // 1. Get the latitude and longitude of the input theNSString *longtitudetext =Self.longitudeField.text; -NSString *latitudetext =Self.latitudeField.text; the     if(Longtitudetext.length = =0|| Latitudetext.length = =0)return; the      theCllocationdegrees latitude =[Latitudetext Doublevalue];94Cllocationdegrees longitude =[Longtitudetext Doublevalue]; the      theCllocation *location =[[Cllocation alloc] Initwithlatitude:latitude longitude:longitude]; the     // 2. Anti-geo-coding98[Self.geocoder reversegeocodelocation:location completionhandler:^ (Nsarray *placemarks, NSError *error) { About         if(Error | | placemarks.count = =0) { -Self.reverdeDetailAddressLabel.text =@"the address you entered was not found, possibly on the moon.";101}Else//Coding Success102         {103             //Show the front landmark information104Clplacemark *firstplacemark =[Placemarks firstobject]; theSelf.reverdeDetailAddressLabel.text =Firstplacemark.name;106             //latitude and longitude degree107Cllocationdegrees latitude =FirstPlacemark.location.coordinate.latitude;108Cllocationdegrees longitude =FirstPlacemark.location.coordinate.longitude;109Self.latitudeField.text = [NSString stringWithFormat:@"%.2f", latitude]; theSelf.longitudeField.text = [NSString stringWithFormat:@"%.2f", longitude];111         } the     }];113 } the  the-(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *)Event the {117 [Self.view Endediting:yes];118 }119 @end

Implementation results:

(1) Geocoding: (geographical name, latitude and longitude coordinates)

　　

Print output:

　　

(2) Anti-geocoding: (Geographical names, longitude and latitude)

　　　

(3) Note: Adjust the keyboard

　　

Click the latitude and longitude TextField for input, the keyboard appears as follows

　　

(4) Note: All the results of the search are in China, because the Apple Map service provider in China is the gold map.

iOS Development extension Chapter-corelocation geocoding