ios中地图

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

#import <CoreLocation/CoreLocation.h>
@interface ViewController : UIViewController<CLLocationManagerDelegate,MKMapViewDelegate>
@property (retain, nonatomic) IBOutlet UITextField *latTxt;
@property (retain, nonatomic) IBOutlet UITextField *lonTxg;
@property (retain, nonatomic) IBOutlet UITextField *heightTxt;

@end

#import "ViewController.h"
#import "MapMark.h"

@interface ViewController ()

//定位管理
@property(nonatomic,retain)CLLocationManager *manager;
@property(nonatomic,retain)MKMapView *mapview;
@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];
self.manager=[[CLLocationManager alloc] init];
_manager.delegate=self;
_manager.desiredAccuracy=kCLLocationAccuracyBest;
_manager.distanceFilter=1000.0;
[_manager release];
self.mapview=[[MKMapView alloc] initWithFrame:CGRectMake(0, 210, 320, 200)];
_mapview.delegate=self;
_mapview.mapType=MKMapTypeStandard;
_mapview.zoomEnabled=YES;
_mapview.showsUserLocation=YES;//调用cclocaiton
[self.view addSubview:_mapview];
[_mapview release];
}

-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[_manager startUpdatingLocation];

}

-(void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[_manager stopUpdatingLocation];
}

#pragma mark -CLLocationManager delegate
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
NSLog(@"__%@",locations);
CLLocation  *lc= [locations lastObject];
self.latTxt.text=[NSString stringWithFormat:@"%3.5f",lc.coordinate.latitude];
self.lonTxg.text=[NSString stringWithFormat:@"%3.5f",lc.coordinate.longitude];
self.heightTxt.text=[NSString stringWithFormat:@"%3.5f",lc.altitude];

//设置显示区域
MKCoordinateRegion region=MKCoordinateRegionMake(lc.coordinate, MKCoordinateSpanMake(0.05, 0.005));
[_mapview setRegion:region animated:YES];
MapMark *mark=[[MapMark alloc] initwithCoordinate:lc.coordinate];
mark.title=@"小A";
mark.subtitle=@"20";

//    、、39.938, 116.416
CLLocationCoordinate2D l2d;
l2d.latitude=37.78594;
l2d.longitude=-122.40717;
MapMark *mark1=[[MapMark alloc] initwithCoordinate:l2d];
mark1.title=@"小b";
mark1.subtitle=@"20";
[_mapview addAnnotation:mark];//只是把坐标的资料，放入到集合中。
[_mapview addAnnotation:mark1];
}

#pragma mark -map delegate

//这个代理方法，会依照坐标资料的集合进行render
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{

NSLog(@"-->vieforannotation-->%@",annotation);
//判断是否刚添加的标注
if ([annotation isKindOfClass:[MapMark class]]) {

static NSString *bridgeAnnotation=@"annotation";
//从缓存中取值
MKPinAnnotationView *view=(MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:bridgeAnnotation];
if (view==nil) {
view=[[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:bridgeAnnotation] autorelease];
view.pinColor=MKPinAnnotationColorPurple;
view.animatesDrop=YES;
view.canShowCallout=YES;
UIButton *btn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame=CGRectMake(0, 0, 50, 50);
[btn setTitle:@"click" forState:UIControlStateNormal];
view.rightCalloutAccessoryView=btn;
}
view.annotation=annotation;//充缓存中取出来重新设置坐标信息
return view;

}
return nil;

}

//点击标记
-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
NSLog(@"-->%@",[view.annotation class]);
if ([view.annotation isMemberOfClass:[MapMark class]]) {
UIButton *btn=(UIButton *)[view rightCalloutAccessoryView];
NSLog(@"--->%@",btn);
}
}

#define MINIMUM_ZOOM_ARC 0.014 //approximately 1 miles (1 degree of arc ~= 69 miles)
#define ANNOTATION_REGION_PAD_FACTOR 1.15
#define MAX_DEGREES_ARC 360
//size the mapView region to fit its annotations
- (void)zoomMapViewToFitAnnotations:(MKMapView *)mapView animated:(BOOL)animated
{
NSArray *annotations = mapView.annotations;
int count = [mapView.annotations count];
if ( count == 0) { return; } //bail if no annotations

//convert NSArray of id <MKAnnotation> into an MKCoordinateRegion that can be used to set the map size
//can't use NSArray with MKMapPoint because MKMapPoint is not an id
MKMapPoint points[count]; //C array of MKMapPoint struct
for( int i=0; i<count; i++ ) //load points C array by converting coordinates to points
{
CLLocationCoordinate2D coordinate = [(id <MKAnnotation>)[annotations objectAtIndex:i] coordinate];
points[i] = MKMapPointForCoordinate(coordinate);
}
//create MKMapRect from array of MKMapPoint
MKMapRect mapRect = [[MKPolygon polygonWithPoints:points count:count] boundingMapRect];
//convert MKCoordinateRegion from MKMapRect
MKCoordinateRegion region = MKCoordinateRegionForMapRect(mapRect);

//add padding so pins aren't scrunched on the edges
region.span.latitudeDelta  *= ANNOTATION_REGION_PAD_FACTOR;
region.span.longitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
//but padding can't be bigger than the world
if( region.span.latitudeDelta > MAX_DEGREES_ARC ) { region.span.latitudeDelta  = MAX_DEGREES_ARC; }
if( region.span.longitudeDelta > MAX_DEGREES_ARC ){ region.span.longitudeDelta = MAX_DEGREES_ARC; }

//and don't zoom in stupid-close on small samples
if( region.span.latitudeDelta  < MINIMUM_ZOOM_ARC ) { region.span.latitudeDelta  = MINIMUM_ZOOM_ARC; }
if( region.span.longitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.longitudeDelta = MINIMUM_ZOOM_ARC; }
//and if there is a sample of 1 we want the max zoom-in instead of max zoom-out
if( count == 1 )
{
region.span.latitudeDelta = MINIMUM_ZOOM_ARC;
region.span.longitudeDelta = MINIMUM_ZOOM_ARC;
}
[mapView setRegion:region animated:animated];
}

- (void)viewWillAppear:(BOOL)animated
{
[self zoomMapViewToFitAnnotations:_mapview animated:animated];
//or maybe you would do the call above in the code path that sets the annotations array
}

- (void)dealloc {
[_latTxt release];
[_lonTxg release];
[_heightTxt release];
[super dealloc];
}
@end