在iOS开发中自动获取当前的位置(GPS定位）

在iOS开发中自动获取当前的位置(GPS定位)

代码的下载连接http://download.csdn.net/detail/jingjingxujiayou/7154113

开发环境 xcode5.0

首先我们要引入这个框架CoreLocation.framework
将这个库引进来#import <CoreLocation/CoreLocation.h>
还有他的代理方法 CLLocationManagerDelegate

GPSViewController.h
注意这里的CLLocationManager* locationmanager要设置成全局变量，要不然得不到你想要的结果哦！具体为什么，我现在还不清楚

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
@interface GPSViewController : UIViewController<CLLocationManagerDelegate>

@property(nonatomic,retain) CLLocationManager* locationmanager;
@end

GPSViewController.m

#import "GPSViewController.h"

@interface GPSViewController ()

@end

@implementation GPSViewController

@synthesize locationmanager;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
locationmanager = [[CLLocationManager alloc]init];

//设置精度
/*
kCLLocationAccuracyBest
kCLLocationAccuracyNearestTenMeters
kCLLocationAccuracyHundredMeters
kCLLocationAccuracyHundredMeters
kCLLocationAccuracyKilometer
kCLLocationAccuracyThreeKilometers
*/
//设置定位的精度
[locationmanager setDesiredAccuracy:kCLLocationAccuracyBest];
//实现协议
locationmanager.delegate = self;
NSLog(@"开始定位");
//开始定位
[locationmanager startUpdatingLocation];

}
#pragma mark locationManager delegate

- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
NSLog(@"hello");
//打印出精度和纬度
CLLocationCoordinate2D coordinate = newLocation.coordinate;
NSLog(@"输出当前的精度和纬度");
NSLog(@"精度：%f 纬度：%f",coordinate.latitude,coordinate.longitude);
//停止定位
[locationmanager stopUpdatingLocation];
//计算两个位置的距离
float distance = [newLocation distanceFromLocation:oldLocation];

NSLog(@" 距离 %f",distance);
}

@end