Xcode中CLLocation的初步使用-地理编码

  1 #import "HMViewController.h"
  2 #import <CoreLocation/CoreLocation.h>
  3 
  4 @interface HMViewController ()
  5 @property (nonatomic, strong) CLGeocoder *geocoder;
  6 
  7 #pragma mark - 地理编码
  8 - (IBAction)geocode;
  9 @property (weak, nonatomic) IBOutlet UITextField *addressField;
 10 @property (weak, nonatomic) IBOutlet UILabel *longitudeLabel;
 11 @property (weak, nonatomic) IBOutlet UILabel *latitudeLabel;
 12 @property (weak, nonatomic) IBOutlet UILabel *detailAddressLabel;
 13 
 14 #pragma mark - 反地理编码
 15 - (IBAction)reverseGeocode;
 16 @property (weak, nonatomic) IBOutlet UITextField *longtitudeField;
 17 @property (weak, nonatomic) IBOutlet UITextField *latitudeField;
 18 @property (weak, nonatomic) IBOutlet UILabel *reverseDetailAddressLabel;
 19 @end
 20 
 21 @implementation HMViewController
 22 
 23 - (CLGeocoder *)geocoder
 24 {
 25     if (!_geocoder) {
 26         self.geocoder = [[CLGeocoder alloc] init];
 27     }
 28     return _geocoder;
 29 }
 30 
 31 - (void)viewDidLoad
 32 {
 33     [super viewDidLoad];
 34     
 35 }
 36 
 37 /**
 38  *  地理编码：地名 -> 经纬度
 39  */
 40 - (void)geocode
 41 {
 42     // 1.获得输入的地址
 43     NSString *address = self.addressField.text;
 44     if (address.length == 0) return;
 45     
 46     // 2.开始编码
 47     [self.geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {
 48         if (error || placemarks.count == 0) {
 49             self.detailAddressLabel.text = @"你输入的地址找不到，可能在火星上";
 50         } else { // 编码成功（找到了具体的位置信息）
 51             // 输出查询到的所有地标信息
 52             for (CLPlacemark *placemark in placemarks) {
 53                 NSLog(@"name=%@ locality=%@ country=%@ postalCode=%@", placemark.name, placemark.locality, placemark.country, placemark.postalCode);
 54             }
 55             
 56             // 显示最前面的地标信息
 57             CLPlacemark *firstPlacemark = [placemarks firstObject];
 58             self.detailAddressLabel.text = firstPlacemark.name;
 59             
 60             CLLocationDegrees latitude = firstPlacemark.location.coordinate.latitude;
 61             CLLocationDegrees longitude = firstPlacemark.location.coordinate.longitude;
 62             self.latitudeLabel.text = [NSString stringWithFormat:@"%.2f", latitude];
 63             self.longitudeLabel.text = [NSString stringWithFormat:@"%.2f", longitude];
 64         }
 65     }];
 66 }
 67 
 68 /**
 69  *  反地理编码：经纬度 -> 地名
 70  */
 71 - (void)reverseGeocode
 72 {
 73     NSString *longtitudeText = self.longtitudeField.text;
 74     NSString *latitudeText = self.latitudeField.text;
 75     if (longtitudeText.length == 0 || latitudeText.length == 0) return;
 76     
 77     CLLocationDegrees latitude = [latitudeText doubleValue];
 78     CLLocationDegrees longtitude = [longtitudeText doubleValue];
 79     
 80     // 开始反向编码
 81     CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longtitude];
 82     [self.geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {
 83         if (error || placemarks.count == 0) {
 84             self.reverseDetailAddressLabel.text = @"你输入的经纬度找不到，可能在火星上";
 85         } else { // 编码成功（找到了具体的位置信息）
 86             // 输出查询到的所有地标信息
 87             for (CLPlacemark *placemark in placemarks) {
 88                 NSLog(@"name=%@ locality=%@ country=%@ postalCode=%@", placemark.name, placemark.locality, placemark.country, placemark.postalCode);
 89             }
 90             
 91             // 显示最前面的地标信息
 92             CLPlacemark *firstPlacemark = [placemarks firstObject];
 93             self.reverseDetailAddressLabel.text = firstPlacemark.name;
 94             
 95             CLLocationDegrees latitude = firstPlacemark.location.coordinate.latitude;
 96             CLLocationDegrees longitude = firstPlacemark.location.coordinate.longitude;
 97             self.latitudeField.text = [NSString stringWithFormat:@"%.2f", latitude];
 98             self.longtitudeField.text = [NSString stringWithFormat:@"%.2f", longitude];
 99         }
100     }];
101 }
102 
103 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
104 {
105     [self.view endEditing:YES];
106 }
107 
108 @end