CoreLocation框架的使用

#import "HMViewController.h"

#import <CoreLocation/CoreLocation.h>

@interface HMViewController () <CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager *locMgr;

@end

@implementation HMViewController

- (CLLocationManager *)locMgr

{

    if (!_locMgr) {

        // 1.创建位置管理器（定位用户的位置）

        self.locMgr = [[CLLocationManager alloc] init];

        // 2.设置代理

        self.locMgr.delegate = self;

    }

    return _locMgr;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    if ([CLLocationManager locationServicesEnabled]) {

        // 开始定位用户的位置

        [self.locMgr startUpdatingLocation];

//        [self.locMgr startMonitoringForRegion:<#(CLRegion *)#>];

//        self.locMgr.purpose

//        self.locMgr.distanceFilter = kCLDistanceFilterNone;

//        self.locMgr.desiredAccuracy = kcllocationac

    } else { // 不能定位用户的位置

        // 1.告诉用户检查网络状况

        // 2.提醒用户打开定位开关

    }

    [self countDistance];

}

- (void)countDistance

{

    CLLocation *loc1 = [[CLLocation alloc] initWithLatitude: longitude:];

    CLLocation *loc2 = [[CLLocation alloc] initWithLatitude: longitude:];

    CLLocationDistance distance = [loc1 distanceFromLocation:loc2];

    NSLog(@"(%@)和(%@)的距离：%f", loc1, loc2, distance);

}

#pragma mark - CLLocationManagerDelegate

/**

 *  当定位到用户的位置时，就会调用（调用比较频繁）

 */

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations

{

    // 数组里面存放的是CLLocation对象， 一个CLLocation就代表一个位置

    CLLocation *loc = [locations lastObject];

    // 纬度：loc.coordinate.latitude

    // 经度：loc.coordinate.longitude

    NSLog(@"纬度=%f, 经度=%f", loc.coordinate.latitude, loc.coordinate.longitude);

    // 停止更新位置(不用定位服务，应当马上停止定位，非常耗电)

    [manager stopUpdatingLocation];

}

//- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region

//{

//

//}

//

//- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region

//{

//

//}

@end

#import "HMViewController.h"

#import <CoreLocation/CoreLocation.h>

@interface HMViewController ()

@property (nonatomic, strong) CLGeocoder *geocoder;

#pragma mark - 地理编码

- (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 - 反地理编码

- (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];

}

/**

 *  地理编码：地名 -> 经纬度

 */

- (void)geocode

{

    // 1.获得输入的地址

    NSString *address = self.addressField.text;

    if (address.length == ) return;

    // 2.开始编码

    [self.geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {

        if (error || placemarks.count == ) {

            self.detailAddressLabel.text = @"你输入的地址找不到，可能在火星上";

        } else { // 编码成功（找到了具体的位置信息）

            // 输出查询到的所有地标信息

            for (CLPlacemark *placemark in placemarks) {

                NSLog(@"name=%@ locality=%@ country=%@ postalCode=%@", placemark.name, placemark.locality, placemark.country, placemark.postalCode);

            }

            // 显示最前面的地标信息

            CLPlacemark *firstPlacemark = [placemarks firstObject];

            self.detailAddressLabel.text = firstPlacemark.name;

            CLLocationDegrees latitude = firstPlacemark.location.coordinate.latitude;

            CLLocationDegrees longitude = firstPlacemark.location.coordinate.longitude;

            self.latitudeLabel.text = [NSString stringWithFormat:@"%.2f", latitude];

            self.longitudeLabel.text = [NSString stringWithFormat:@"%.2f", longitude];

        }

    }];

}

/**

 *  反地理编码：经纬度 -> 地名

 */

- (void)reverseGeocode

{

    NSString *longtitudeText = self.longtitudeField.text;

    NSString *latitudeText = self.latitudeField.text;

    if (longtitudeText.length ==  || latitudeText.length == ) return;

    CLLocationDegrees latitude = [latitudeText doubleValue];

    CLLocationDegrees longtitude = [longtitudeText doubleValue];

    // 开始反向编码

    CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longtitude];

    [self.geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {

        if (error || placemarks.count == ) {

            self.reverseDetailAddressLabel.text = @"你输入的经纬度找不到，可能在火星上";

        } else { // 编码成功（找到了具体的位置信息）

            // 输出查询到的所有地标信息

            for (CLPlacemark *placemark in placemarks) {

                NSLog(@"name=%@ locality=%@ country=%@ postalCode=%@", placemark.name, placemark.locality, placemark.country, placemark.postalCode);

            }

            // 显示最前面的地标信息

            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