iOS Development extension Chapter-corelocation geocoding

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:

YYVIEWCONTROLLER.M file

  1//2//YYVIEWCONTROLLER.M 3//19-geocoding 4//5//Created by Apple on 14-8-11. 6//Copyright (c) 2014 Yangyong.  All rights reserved.  7//8 9 #import "YYViewController.h" #import <CoreLocation/CoreLocation.h> @interface Yyviewcontroller () @property (Nonatomic,strong) Clgeocoder *geocoder; #pragma mark-Geographical Code-(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; #pragma mark-anti-geocoding-(ibaction) Reversegeocode; @property (Weak, nonatomic) Iboutlet Uitextfield *longitudefield; @property (Weak, nonatomic) Iboutlet Uitextfield *latitudefield; @property (Weak, nonatomic) Iboutlet UILabel *reverdedetailaddresslabel; @end @implementation yyviewcontroller #pragma mark-lazy load-(Clgeocoder *) Geocoder (_geocoder==nil) {_geocode _geocoder=[[clgeocoder alloc]init]; " R -(void) viewdidload x [[Super Viewdidload]; 42} 43/** 44 * geocoding: Place-name/latitude-Longitude coordinates */-(ibaction) GE      Ocode {47//1. To obtain the input address nsstring *address=self.addressfield.text; if (address.length==0) return; 50 51//2. Start Geocoding 52//Description: Call the method below to start encoding, regardless of whether the encoding succeeds or fails, calls the methods in block [Self.geocoder geocodeaddressstring:address Comp letionhandler:^ (Nsarray *placemarks, Nserror *error) {54//If there is an error message, or if the number of place-name elements obtained in the array is 0, then the description does not find the IF (Erro R | |         placemarks.count==0) {[email protected] "The address you entered was not found, possibly on the moon";}else//encoding succeeded, found the specific location information 58 {59//print to see all location information found. */* The name: Loca  Lity: City Country: National PostalCode: ZIP/Postal Code * * (Clplacemark *pLacemark in Placemarks) {NSLog (@ "name=%@ locality=%@ country=%@ postalcode=%@", Placemark.name,placemar K.locality,placemark.country,placemark.postalcode); 68} 69 70//Remove the first display in the obtained geographic information array on the interface Clplacemark *firstplacemark=[place Marks Firstobject]; 72//Detailed address name Self.detailaddresslabel.text=firstplacemark.name; 74//Latitude cllocationdegrees latitude=firstplacemark.location.coordinate.latitude; 76//Longitude cllocationdegrees longitude=firstplacemark.location.coordinate.longitude; Self.latitudelabel.text=[nsstring stringwithformat:@ "%.2f", Latitude]; Self.longitudelabel.text=[nsstring stringwithformat:@ "%.2f", longitude]; 80} 81}]; 82} 83 84/** 85 * Anti-geocoding: latitude/Longitude coordinates, place name (Ibaction) reversegeocode {88//1. Get input latitude and longitude NSString *long Titudetext=self.longitudefield.text; NSString *latitudEtext=self.latitudefield.text; if (longtitudetext.length==0| | latitudetext.length==0) return; Cllocationdegrees Latitude=[latitudetext Doublevalue]; 94 cllocationdegrees Longitude=[longtitudetext Doublevalue]; Cllocation *location=[[cllocation Alloc]initwithlatitude:latitude Longitude:longitude]; 97//2. Anti-geocoding 98 [Self.geocoder reversegeocodelocation:location completionhandler:^ (Nsarray *placemarks, NSError *e Rror) {if (error| |             placemarks.count==0) {[email protected] "The address you entered was not found, possibly on the moon"; 101}else//Encoded successfully 102 {103 Show the front landmark information 104 Clplacemark *firstplacemark=[placemarks firstobject];105 Self.reverdedeta iladdresslabel.text=firstplacemark.name;106//latitude and longitude 107 cllocationdegrees Latitude=firstplacemark.loc             ation.coordinate.latitude;108 cllocationdegrees longitude=firstplacemark.location.coordinate.longitude;109 Self.latitudeField.text=[nsstring stringwithformat:@ "%.2f", latitude];110 self.longitudefield.text=[nsstring StringWithForma t:@ "%.2f", longitude];111}112}];113}114-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event1 {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