第一步，新建一个singleView的空白工程,如果新建，这里不做赘述了。
第二步：因为地图开发相关的framework：MapKit.framework、CoreLocation.framework， 至于如何添加，一般的ios相关博客都是有介绍。
在主界面的控制器 ViewController.h 文件中，我们啥也不做，.m文件中，我们需声明一个 CLLocationManager* locationManager的属性，我们让其实现CLLocationManagerDelegate的协议，并覆写其更新位置的方法，如下
1 #import "ViewController.h"
2 #import <CoreLocation/CoreLocation.h>
3 @interface ViewController ()<CLLocationManagerDelegate>{
4
5 }
6
7 @property (nonatomic,retain)CLLocationManager* locationManager;
8
9 @end
10
11 @implementation ViewController
12
13 -(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
14
15 {
16 if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
17 NSLog(@"nibName: %@ bundle: %@",nibBundleOrNil,nibBundleOrNil);
18 _locationManager = [[CLLocationManager alloc] init];
19
20 }
21
22 return self;
23 }
24
25 - (void)dealloc
26 {
27 self.locationManager = nil;
28 [super dealloc];
}
29 - (void)viewDidLoad
30 {
31 [super viewDidLoad];
32 Do any additional setup after loading the view, typically from a nib.
33 delegate
34 self.locationManager.delegate = self;
35 The desired location accuracy.
36 self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
37 Specifies the minimum update distance in meters.
38
39 self.locationManager.distanceFilter = kCLDistanceFilterNone;
40
41 self.locationManager.purpose = @"To provide functionality based on user's current location.";
42
43 [self.locationManager startUpdatingLocation];
44 }
45
46 - (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
47 NSLog(@"didChangeAuthorizationStatus---%u",status);
48 }
49
50 - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
51 NSLog(@"didChangeAuthorizationStatus----%@",error);
52 }
53
54 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
55 UIAlertView* av = [[UIAlertView alloc] initWithTitle:@"update" message:[NSString stringWithFormat:@"didUpdateToLocation: newLocation: %@ old:%@",newLocation,oldLocation] delegate:nil cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil nil];
56 [av show];
57 [av release];
}