iOS.定位服务与地图应用.01.定位服务编程

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

@interface T20140621195534ViewController : UIViewController<CLLocationManagerDelegate>

//经度
@property (weak, nonatomic) IBOutlet UITextField *txtLng;
//纬度
@property (weak, nonatomic) IBOutlet UITextField *txtLat;
//高度
@property (weak, nonatomic) IBOutlet UITextField *txtAlt;

@property(nonatomic, strong) CLLocationManager *locationManager;

@end

#import "T20140621195534ViewController.h"

@interface T20140621195534ViewController ()

@end

@implementation T20140621195534ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    //定位服务管理对象初始化
    _locationManager = [[CLLocationManager alloc] init];
    _locationManager.delegate = self;
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    _locationManager.distanceFilter = 1000.0f;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //开始定位
    [_locationManager startUpdatingLocation];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    //停止定位
    [_locationManager stopUpdatingLocation];
}
#pragma mark Core Location委托方法用于实现位置的更新
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation *currLocation = [locations lastObject];
    _txtLat.text = [NSString stringWithFormat:@"%3.5f",
                    currLocation.coordinate.latitude];
    _txtLng.text = [NSString stringWithFormat:@"%3.5f",
                    currLocation.coordinate.longitude];
    _txtAlt.text = [NSString stringWithFormat:@"%3.5f",
                    currLocation.altitude];
    
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"error: %@",error);
}
@end