CLGeocoder基本使用

////  02-地理編碼
//
//  Created by apple on 14-8-7.
//  Copyright (c) 2014年 CoderJee. All rights reserved.
//

#import "HMViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface HMViewController ()
@property (nonatomic, strong) CLGeocoder *geocoder;

#pragma mark - 地理編碼
- (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 - 反地理編碼
- (IBAction)reverseGeocode;
@property (weak, nonatomic) IBOutlet UITextField *longtitudeField;
@property (weak, nonatomic) IBOutlet UITextField *latitudeField;
@property (weak, nonatomic) IBOutlet UILabel *reverseDetailAddressLabel;
@end

@implementation HMViewController

- (CLGeocoder *)geocoder
{
    if (!_geocoder) {
        self.geocoder = [[CLGeocoder alloc] init];
    }
    return _geocoder;

}

 - (void)viewDidLoad
{
    [super viewDidLoad];
    
}

/**
 *  地理編碼：地名 -> 經緯度
 */
- (void)geocode
{
    // 1.得到輸入的地址xx
    NSString *address = self.addressField.text;
    if (address.length == 0) return;
    
    // 2.開始編碼
    [self.geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {
        if (error || placemarks.count == 0) {
            self.detailAddressLabel.text = @"你輸入的地址找不到，可能在火星上";
        } else { // 編碼成功（找到了具體的位置信息）
            // 輸出查詢到的全部地標信息
            for (CLPlacemark *placemark in placemarks) {
                // 名字, 城市，國家，郵政編碼
                NSLog(@"name=%@ locality=%@ country=%@ postalCode=%@", placemark.name, placemark.locality, placemark.country, placemark.postalCode);
            }
            
            // 顯示最前面的地標信息
            CLPlacemark *firstPlacemark = [placemarks firstObject];
            self.detailAddressLabel.text = firstPlacemark.name;
            // 緯度
            CLLocationDegrees latitude = firstPlacemark.location.coordinate.latitude;
            // 經度
            CLLocationDegrees longitude = firstPlacemark.location.coordinate.longitude;
            self.latitudeLabel.text = [NSString stringWithFormat:@"%.2f", latitude];
            self.longitudeLabel.text = [NSString stringWithFormat:@"%.2f", longitude];
        }
    }];
}

/**
 *  反地理編碼：經緯度 -> 地名
 */
- (void)reverseGeocode
{
    NSString *longtitudeText = self.longtitudeField.text;
    NSString *latitudeText = self.latitudeField.text;
    if (longtitudeText.length == 0 || latitudeText.length == 0) return;
    
    CLLocationDegrees latitude = [latitudeText doubleValue];
    CLLocationDegrees longtitude = [longtitudeText doubleValue];
    
    // 開始反向編碼
    CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longtitude];
    [self.geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {
        if (error || placemarks.count == 0) {
            self.reverseDetailAddressLabel.text = @"你輸入的經緯度找不到，可能在火星上";
        } else { // 編碼成功（找到了具體的位置信息）
            // 輸出查詢到的全部地標信息
            for (CLPlacemark *placemark in placemarks) {
                NSLog(@"name=%@ locality=%@ country=%@ postalCode=%@", placemark.name, placemark.locality, placemark.country, placemark.postalCode);
            }
            
            // 顯示最前面的地標信息
            CLPlacemark *firstPlacemark = [placemarks firstObject];
            self.reverseDetailAddressLabel.text = firstPlacemark.name;
            
            CLLocationDegrees latitude = firstPlacemark.location.coordinate.latitude;
            CLLocationDegrees longitude = firstPlacemark.location.coordinate.longitude;
            self.latitudeField.text = [NSString stringWithFormat:@"%.2f", latitude];
            self.longtitudeField.text = [NSString stringWithFormat:@"%.2f", longitude];
        }
    }];

}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.view endEditing:YES];
}

@end