#import "DXWViewController.h" #import "Place.h" @interface DXWViewController ()  @end  @implementation DXWViewController  - (void)viewDidLoad {     [super viewDidLoad];     self.manager  = [[CLLocationManager alloc] init];     self.manager.delegate = self;     //精度     self.manager.desiredAccuracy = kCLLocationAccuracyBest;     [self.manager startUpdatingLocation]; 	self.mapview.showsUserLocation = YES; }   -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {     self.location = [locations objectAtIndex:0];     [self.labels[0] setText:[NSString stringWithFormat:@"%f\u00B0",self.location.coordinate.longitude]];     [self.labels[1] setText:[NSString stringWithFormat:@"%f\u00B0",self.location.coordinate.longitude]];     [self.labels[2] setText:[NSString stringWithFormat:@"%gm",self.location.horizontalAccuracy]];     [self.labels[3] setText:[NSString stringWithFormat:@"%gm",self.location.altitude]];     [self.labels[4] setText:[NSString stringWithFormat:@"%gm",self.location.verticalAccuracy]];          Place *place = [[Place alloc] init];     place.coordinate = self.location.coordinate;     place.title = @"Title";     place.subtitle = @"subTitle";          [self.mapview addAnnotation:place];     //設置精度范圍     MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(place.coordinate, 1000, 1000);     [self.mapview setRegion:region animated:YES]; } - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning]; }  - (void)dealloc {     [_mapview release];     [_labels release];     [super dealloc]; } @end

3.創建大頭針的類：

#import <Foundation/Foundation.h> #import <MapKit/MapKit.h> @interface Place : NSObject<MKAnnotation>  @property(copy,nonatomic)NSString *title; @property(copy,nonatomic)NSString *subtitle; @property(assign,nonatomic)CLLocationCoordinate2D coordinate;  @end