iOS.定位服务与地图应用.02.地理信息反编码

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

@interface T20140621213001ViewController : UIViewController<CLLocationManagerDelegate>

//经度
@property (weak, nonatomic) IBOutlet UITextField *txtLng;
//纬度
@property (weak, nonatomic) IBOutlet UITextField *txtLat;
//高度
@property (weak, nonatomic) IBOutlet UITextField *txtAlt;

@property(nonatomic, strong) CLLocationManager *locationManager;

@property(nonatomic, strong)  CLLocation *currLocation;

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

- (IBAction)reverseGeocode:(id)sender;


@end

#import "T20140621213001ViewController.h"

@interface T20140621213001ViewController ()

@end

@implementation T20140621213001ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    //定位服务管理对象初始化
    _locationManager = [[CLLocationManager alloc] init];
    _locationManager.delegate = self;
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    _locationManager.distanceFilter = 1000.0f;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //开始定位
    [_locationManager startUpdatingLocation];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    //停止定位
    [_locationManager stopUpdatingLocation];
}

#pragma mark Core Location委托方法用于实现位置的更新
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    _currLocation = [locations lastObject];
    _txtLat.text = [NSString stringWithFormat:@"%3.5f",
                    _currLocation.coordinate.latitude];
    _txtLng.text = [NSString stringWithFormat:@"%3.5f",
                    _currLocation.coordinate.longitude];
    _txtAlt.text = [NSString stringWithFormat:@"%3.5f",
                    _currLocation.altitude];
    
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"error: %@",error);
}


- (IBAction)reverseGeocode:(id)sender {
    
    [self.txtLng resignFirstResponder];
    [self.txtLat resignFirstResponder];
    [self.txtAlt resignFirstResponder];
    
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    
    [geocoder reverseGeocodeLocation:_currLocation
                   completionHandler:^(NSArray *placemarks, NSError *error) {
                       
                       if ([placemarks count] > 0) {
                           
                           CLPlacemark *placemark = placemarks[0];
                           
                           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:@"%@ 
%@ 
%@",state, address,city];
                       }
                       
                   }];
}


@end