[IOS地图开发系类]2、位置解码CLGeocoder

接第一步的操作，获取到地址信息经纬度后，我们可以对其进行解码，解码采用的CLGeocoder这个类，使用方式如下：

1、在ViewControlelr.m文件中声明一个CLGeocoder的属性，给页面加一个button，然后在处理方法中，对上一篇获取的地址坐标进行解码，

code如下

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
@interface ViewController ()<CLLocationManagerDelegate,MKMapViewDelegate>{
}
@property (nonatomic,retain)CLLocationManager* locationManager;
@property (nonatomic,retain)CLLocation* location;
@property (nonatomic, retain) CLGeocoder *myGeocoder;
@end

@implementation ViewController

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        _locationManager = [[CLLocationManager alloc] init];
    }
    return  self;
}
- (void)dealloc
{
    self.locationManager = nil;
    self.location = nil;
    self.myGeocoder = nil;
    [super dealloc];
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //delegate
    self.locationManager.delegate = self;
    //The desired location accuracy.
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    //Specifies the minimum update distance in meters.
    self.locationManager.distanceFilter = kCLDistanceFilterNone;
    self.locationManager.purpose =
    @"To provide functionality based on user's current location.";
    [self.locationManager startUpdatingLocation];

   UIButton *addBt = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    addBt.frame = CGRectMake(, , , );
    [addBt setTitle:@"locationMe" forState:UIControlStateNormal];

    [addBt addTarget:self action:@selector(handleLocationMe:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:addBt];

     self.myGeocoder = [[CLGeocoder alloc] init];
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    NSLog(@"didChangeAuthorizationStatus---%u",status);
}

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

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{

    UIAlertView* av = [[UIAlertView alloc] initWithTitle:@"update" message:[NSString stringWithFormat:@"didUpdateToLocation:  newLocation: %@  old:%@",newLocation,oldLocation] delegate:nil cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];
    [av show];
    [av release];

    self.location = newLocation;

   NSLog(@"didUpdateToLocation:  newLocation: %@",newLocation);
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)handleLocationMe:(id)sender
{

    [self.myGeocoder
     reverseGeocodeLocation:self.location completionHandler:^(NSArray *placemarks, NSError *error) {
         if (error == nil &&[placemarks count] > ){
             CLPlacemark *placemark = [placemarks objectAtIndex:];
             /* We received the results */
             NSLog(@"Country = %@", placemark.country);
             NSLog(@"Postal Code = %@", placemark.postalCode);
             NSLog(@"Locality = %@", placemark.locality);
             NSLog(@"dic = %@", placemark.addressDictionary );
             NSLog(@"dic FormattedAddressLines= %@", [placemark.addressDictionary objectForKey:@"FormattedAddressLines"]);
             NSLog(@"dic Name = %@", [placemark.addressDictionary objectForKey:@"Name"]);
             NSLog(@"dic State = %@", [placemark.addressDictionary objectForKey:@"State"]);
             NSLog(@"dic Street = %@", [placemark.addressDictionary objectForKey:@"Street"]);
             NSLog(@"dic SubLocality= %@", [placemark.addressDictionary objectForKey:@"SubLocality"]);
             NSLog(@"dic SubThoroughfare= %@", [placemark.addressDictionary objectForKey:@"SubThoroughfare"]);
             NSLog(@"dic Thoroughfare = %@", [placemark.addressDictionary objectForKey:@"Thoroughfare"]);

         }
         else if (error == nil &&
                  [placemarks count] == ){
             NSLog(@"No results were returned.");
         }
         else if (error != nil){
             NSLog(@"An error occurred = %@", error);
         }
     }];
}
@end

输出如下:

　　

-- ::16.578 LBS_001_CLLocationManager[:] didChangeAuthorizationStatus---
-- ::17.288 LBS_001_CLLocationManager[:] didUpdateToLocation:  newLocation: <+39.93751238,+116.34143052> +/- 65.00m (speed -1.00 mps / course -1.00) @ -- 中国标准时间下午8时47分16秒
-- ::17.300 LBS_001_CLLocationManager[:] didUpdateToLocation:  newLocation: <+39.93751238,+116.34143052> +/- 65.00m (speed -1.00 mps / course -1.00) @ -- 中国标准时间下午8时47分16秒
-- ::17.351 LBS_001_CLLocationManager[:] didUpdateToLocation:  newLocation: <+39.93770077,+116.34199932> +/- 70.88m (speed -1.00 mps / course -1.00) @ -- 中国标准时间下午8时47分16秒
-- ::17.392 LBS_001_CLLocationManager[:] didUpdateToLocation:  newLocation: <+39.93767287,+116.34189085> +/- 65.00m (speed -1.00 mps / course -1.00) @ -- 中国标准时间下午8时47分17秒
-- ::51.976 LBS_001_CLLocationManager[:] Country = 中国
-- ::51.977 LBS_001_CLLocationManager[:] Postal Code = (null)
-- ::51.979 LBS_001_CLLocationManager[:] Locality = (null)
-- ::51.980 LBS_001_CLLocationManager[:] dic = {
    Country = "\U4e2d\U56fd";
    CountryCode = CN;
    FormattedAddressLines =     (
        "\U4e2d\U56fd\U5317\U4eac\U5e02\U897f\U57ce\U533a\U5c55\U89c8\U8def\U8857\U9053\U897f\U76f4\U95e8\U5916\U5927\U8857132\U53f7"
    );
    Name = "\U4e2d\U56fd\U5317\U4eac\U5e02\U897f\U57ce\U533a\U5c55\U89c8\U8def\U8857\U9053\U897f\U76f4\U95e8\U5916\U5927\U8857132\U53f7";
    State = "\U5317\U4eac\U5e02";
    Street = "\U897f\U76f4\U95e8\U5916\U5927\U8857 132\U53f7";
    SubLocality = "\U897f\U57ce\U533a";
    SubThoroughfare = "132\U53f7";
    Thoroughfare = "\U897f\U76f4\U95e8\U5916\U5927\U8857";
}
-- ::51.982 LBS_001_CLLocationManager[:] dic FormattedAddressLines= (
    "\U4e2d\U56fd\U5317\U4eac\U5e02\U897f\U57ce\U533a\U5c55\U89c8\U8def\U8857\U9053\U897f\U76f4\U95e8\U5916\U5927\U8857132\U53f7"
)
-- ::51.983 LBS_001_CLLocationManager[:] dic Name = 中国北京市西城区展览路街道西直门外大街132号
-- ::51.985 LBS_001_CLLocationManager[:] dic State = 北京市
-- ::51.986 LBS_001_CLLocationManager[:] dic Street = 西直门外大街 132号
-- ::51.987 LBS_001_CLLocationManager[:] dic SubLocality= 西城区
-- ::51.988 LBS_001_CLLocationManager[:] dic SubThoroughfare= 132号
-- ::51.989 LBS_001_CLLocationManager[:] dic Thoroughfare = 西直门外大街