iOS.定位服务与地图应用.03.地理信息编码查询

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <AddressBook/AddressBook.h>
#import <AddressBookUI/AddressBookUI.h>

@interface T20140621221104ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UITextField *txtQueryKey;

@property (weak, nonatomic) IBOutlet UITextView *txtView;

- (IBAction)geocodeQuery:(id)sender;

@end

#import "T20140621221104ViewController.h"

@interface T20140621221104ViewController ()

@end

@implementation T20140621221104ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}- (IBAction)geocodeQuery:(id)sender {
    
    if (_txtQueryKey.text == nil || [_txtQueryKey.text length] == 0) {
        return;
    }
    
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder geocodeAddressString:_txtQueryKey.text completionHandler:^(NSArray *placemarks, NSError *error) {
        NSLog(@"查询记录数：%i",[placemarks count]);
        if ([placemarks count] > 0) {
            CLPlacemark* placemark = placemarks[0];
            
            CLLocationCoordinate2D coordinate = placemark.location.coordinate;
            NSString* strCoordinate  = [NSString stringWithFormat:@"经度:%3.5f 
纬度:%3.5f",coordinate.latitude, coordinate.longitude];
            
            NSDictionary *addressDictionary =  placemark.addressDictionary;
            
            NSString *address = [addressDictionary
                                 objectForKey:(NSString *)kABPersonAddressStreetKey];
            address = address == nil ? @"": address;
            
            NSString *state = [addressDictionary
                               objectForKey:(NSString *)kABPersonAddressStateKey];
            state = state == nil ? @"": state;
            
            NSString *city = [addressDictionary
                              objectForKey:(NSString *)kABPersonAddressCityKey];
            city = city == nil ? @"": city;
            
            _txtView.text = [NSString stringWithFormat:@"%@ 
 %@ 
%@ 
%@",strCoordinate,state, address,city];
            
            //关闭键盘
            [_txtQueryKey resignFirstResponder];
        }
    }];
    
}

@end