iOS定位--CoreLocation

#import <CoreLocation/CoreLocation.h>

<CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager *locMgr;

- (CLLocationManager *)locMgr

{

warning 定位服务不可用

if(![CLLocationManager locationServicesEnabled]) return nil;

if (!_locMgr) {

// 创建定位管理者

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

// 设置代理

self.locMgr.delegate = self;

}

return _locMgr;

}

- (void)viewDidLoad {

[super viewDidLoad];

// 开始定位用户的位置

[self.locMgr startUpdatingLocation];

}

#pragma mark - CLLocationManagerDelegate

/**

*  只要定位到用户的位置，就会调用（调用频率特别高）

*  @param locations : 装着CLLocation对象

*/

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

{

// 1.取出位置对象

CLLocation *loc = [locations firstObject];

// 2.取出经纬度

CLLocationCoordinate2D coordinate = loc.coordinate;

// 3.打印经纬度

NSLog(@"didUpdateLocations------%f %f", coordinate.latitude, coordinate.longitude);

// 停止定位(省电措施：只要不想用定位服务，就马上停止定位服务)

[manager stopUpdatingLocation];

}

/**

*  计算2个经纬度之间的直线距离

*/

- (void)countLineDistance

{

// 计算2个经纬度之间的直线距离

CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:40 longitude:116];

CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:41 longitude:116];

CLLocationDistance distance = [loc1 distanceFromLocation:loc2];

NSLog(@"%f", distance);

}