[ios] 아이폰 GPS 사용하기

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@interface LocationServiceViewController : UIViewController
    <CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;
    IBOutlet UILabel *latitude;
    IBOutlet UILabel *longitude;
    IBOutlet UILabel *Heading;
}

@property (nonatomic, retain) CLLocationManager *locationManager;
@property (nonatomic, retain) IBOutlet UILabel *latitude;
@property (nonatomic, retain) IBOutlet UILabel *longitude;
@property (nonatomic, retain) IBOutlet UILabel *Heading;

@end

#import "LocationServiceViewController.h"

@implementation LocationServiceViewController

@synthesize locationManager;
@synthesize latitude;
@synthesize longitude;
@synthesize Heading;

// Implement viewDidLoad to do additional setup after loading the view,
// typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.desiredAccuracy =
        kCLLocationAccuracyNearestTenMeters;

    self.locationManager.delegate = self;
    [self.locationManager startUpdatingLocation];
    [self.locationManager startUpdatingHeading];
    
    CLLocation *curPos = self.locationManager.location;

    // 위도
    NSNumber *nLatitude =
        [NSNumber numberWithDouble:curPos.coordinate.latitude];

    // 경도
    NSNumber *nLongitude =
        [NSNumber numberWithDouble:curPos.coordinate.longitude];
    
    NSString *sPosition1 =
        [NSString stringWithFormat:@"%.3f", [nLatitude doubleValue]];

    NSString *sPosition2 =
        [NSString stringWithFormat:@"%.3f", [nLongitude doubleValue]];

    //NSLog(@"%@",sPosition);
    [self.latitude setText:sPosition1];
    [self.longitude setText:sPosition2];
}

// 좌표 업데이트 델리게이트
-(void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
    fromLocation:(CLLocation *)oldLocation
{
    // GPS 좌표 업데이트 된 후 호출 됨
    
    // 위도
    NSNumber *nLatitude =
        [NSNumber numberWithDouble:newLocation.coordinate.latitude];

    // 경도
    NSNumber *nLongitude =
        [NSNumber numberWithDouble:newLocation.coordinate.longitude];
    
    NSString *sPosition1 =
        [NSString stringWithFormat:@"%.3f", [nLatitude doubleValue]];

    NSString *sPosition2 =
        [NSString stringWithFormat:@"%.3f", [nLongitude doubleValue]];
    //NSLog(@"%@",sPosition);
    [self.latitude setText:sPosition1];
    [self.longitude setText:sPosition2];
}

// 나침반 델리게이트
-(void)locationManager:(CLLocationManager *)manager
    didUpdateHeading:(CLHeading *)newHeading
{
    NSString *headingStr =
        [NSString stringWithFormat:@"%.4lf", newHeading.magneticHeading];

    //NSLog(@"%@",headingStr);
    [self.Heading setText:headingStr];
}

// GPS 오류 델리게이트
-(void)locationManager:(CLLocationManager *)manager
    didFailWithError:(NSError *)error
{
    // GPS 좌표 업데이트에 오류가 발생할 때 호출 됨
}

// Override to allow orientations
// other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:
    (UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    [self.locationManager stopUpdatingHeading];
    self.locationManager = nil;
}

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

@end