1、添加地图

1.1 新一个Single View app ，选择默认项，创建后，在ViewController.h

#import <UIKit/UIKit.h>#import <MapKit/MapKit.h>#import <CoreLocation/CoreLocation.h>@interface ViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate> {    MKMapView *map;    CLLocationManager *locationManager;}@end

1.2在ViewController.m中添加

- (void)viewDidLoad{    map = [[MKMapView alloc] initWithFrame:[self.view bounds]];    map.showsUserLocation = YES;    map.mapType = MKMapTypeSatellite;    [self.view addSubview:map];    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}

运行：

OMG,看到的是世界地图。怎么定位到指定的位置呢？比如定位回来伟大的祖国首都？

这里map.mapType =MKMapTypeSatellite;我用到是卫星地图，可以使用标准的地图，

map.mapType =MKMapTypeStandard;

注意，如果此时你编译有错误，请拉到博客最后查看：5、遇到的问题

2、定位到指定经纬度

CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);        float zoomLevel = 0.02;    MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));    [map setRegion:[map regionThatFits:region] animated:YES];

这样，就我们就定位的了故宫了。

3、添加标注大头针

3.1 新建一个标注类：CustomAnnotation

按Command+N，继承NSObject。在CustomAnnotation.h 和CustomAnnotation.m文件添加如下代码：

#import <Foundation/Foundation.h>#import <MapKit/MapKit.h>@interface CustomAnnotation : NSObject <MKAnnotation>{    CLLocationCoordinate2D coordinate;    NSString *title;    NSString *subtitle;}-(id) initWithCoordinate:(CLLocationCoordinate2D) coords;@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;@property (nonatomic, retain) NSString *title;@property (nonatomic, retain) NSString *subtitle;@end

3.1 使用大头针，

新建个方法添加大头针的

-(void)createAnnotationWithCoords:(CLLocationCoordinate2D) coords {    CustomAnnotation *annotation = [[CustomAnnotation alloc] initWithCoordinate:                                     coords];    annotation.title = @"标题";    annotation.subtitle = @"子标题";    [map addAnnotation:annotation];}

调用

CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);        float zoomLevel = 0.02;    MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));    [map setRegion:[map regionThatFits:region] animated:YES];        [self createAnnotationWithCoords:coords];

这样我们就把大头针定位在故宫了

4、定位到当前位置并获取当前经纬度

前面我们已经添加了locationManager，现在在DidViewLoad里直接调用

locationManager = [[CLLocationManager alloc] init];    locationManager.delegate = self;    [locationManager startUpdatingLocation];

实现协议方法收到定位成功后的经纬度

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {    [locationManager stopUpdatingLocation];        NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];    NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];    NSLog(@"Lat: %@  Lng: %@", strLat, strLng);}- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {    NSLog(@"locError:%@", error);}

运行，允许获取当前位置，打印log

2012-06-28 23:58:32.237 MapDemo[8202:11603] Lat: 39.9011  Lng: 116.3000

如果不允许：打印出错误日志

2012-06-28 23:25:03.109 MapDemo[7531:11603] locError:Error Domain=kCLErrorDomain Code=1 "The operation couldn’t be completed. (kCLErrorDomain error 1.)"

定位后，移动到当前位置：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {    [locationManager stopUpdatingLocation];        NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];    NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];    NSLog(@"Lat: %@  Lng: %@", strLat, strLng);        CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(newLocation.coordinate.latitude,newLocation.coordinate.longitude);    float zoomLevel = 0.02;    MKCoordinateRegion region = MKCoordinateRegionMake(coords,MKCoordinateSpanMake(zoomLevel, zoomLevel));    [map setRegion:[map regionThatFits:region] animated:YES];}