objective c how to get placemarks of given coordin

问题:

I have a question related to reverse geo-coding.

In my app, I have some coordinates (not my current coordinates) and I want to convert them into placemarks. I've dug a lot of websites and codes but they are all about reverse geocoding of current location...

Is there any way to get placemarks of specified coordinates (which are not current location)?

And if there is, please help me with some code or references.

回答1:

You can achieve this in two ways:-

First way:- Get the info using google api

-(void)findAddresstoCorrespondinglocation
{
    NSString *str = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?latlng=%f,%f&sensor=false",myCoordInfo.latitude,myCoordInfo.longitude];
    NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:url] autorelease];
    [request setRequestMethod:@"GET"];
    [request setDelegate:self];
    [request setDidFinishSelector: @selector(mapAddressResponse:)];
    [request setDidFailSelector: @selector(mapAddressResponseFailed:)];
    [networkQueue addOperation: request];
    [networkQueue go];

}

in response you will get all information about the location coordinates you specified.

Second Approach:-

Implement reverse geocoding

a.)add mapkit framework

b.)Make instance of MKReverseGeocoder in .h file

MKReverseGeocoder *reverseGeocoder;

c.)in .m file

self.reverseGeocoder = [[MKReverseGeocoder alloc] initWithCoordinate:cordInfo];
    reverseGeocoder.delegate = self;
    [reverseGeocoder start];

Implement two delegate methods of MKReverseGeoCoder

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
    NSLog(@"MKReverseGeocoder has failed.");
}

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{
    MKPlacemark * myPlacemark = placemark;
    NSString *city = myPlacemark.thoroughfare;
    NSString *subThrough=myPlacemark.subThoroughfare;
    NSString *locality=myPlacemark.locality;
    NSString *subLocality=myPlacemark.subLocality;
    NSString *adminisArea=myPlacemark.administrativeArea;
    NSString *subAdminArea=myPlacemark.subAdministrativeArea;
    NSString *postalCode=myPlacemark.postalCode;
    NSString *country=myPlacemark.country;
    NSString *countryCode=myPlacemark.countryCode;
    NSLog(@"city%@",city);
    NSLog(@"subThrough%@",subThrough);
    NSLog(@"locality%@",locality);
    NSLog(@"subLocality%@",subLocality);
    NSLog(@"adminisArea%@",adminisArea);
    NSLog(@"subAdminArea%@",subAdminArea);
    NSLog(@"postalCode%@",postalCode);
    NSLog(@"country%@",country);
    NSLog(@"countryCode%@",countryCode);

    }