IOS 地图控件 ： mapkit

第一步

显示地图

- (void)viewDidLoad
{  self.mapView=[[[MKMapView alloc] initWithFrame:self.view.bounds] autorelease];mapView.delegate=self;mapView.autoresizingMask= (UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);[self.view addSubview:mapView];[self.mapView setZoomEnabled:YES];[self.mapView setScrollEnabled:YES];   [super viewDidLoad];// Do any additional setup after loading the view from its nib.
} 

也可以直接托控件。 直接运行，OK . 没问题。

第二步：

启动定位服务，标注自己当前位置

  if (lm) {lm.delegate=nil;[lm release];lm=nil;} lm=[[CLLocationManager alloc] init];  lm.delegate=self;lm.desiredAccuracy= kCLLocationAccuracyNearestTenMeters;lm.distanceFilter =1000.0f; [lm startUpdatingLocation];

如果定位成功 ：

-(void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{if (!newLocation) {[self locationManager:manager didFailWithError:(NSError *)NULL]; } if (signbit(newLocation.horizontalAccuracy)) {[self locationManager:manager didFailWithError:(NSError *)NULL];  return;} [manager stopUpdatingLocation]; CLLocationCoordinate2D _coordination = [newLocation coordinate]; now_lat = _coordination.latitude;now_lng =_coordination.longitude; mapView.showsUserLocation =YES;[lm stopUpdatingLocation]; /// [NSThread detachNewThreadSelector:@selector(getNear) toTarget:self withObject:nil];}

这样便可以定自己当前位置。

/***

线程是根据当前经纬度 从网络上获取附近 。

返回JSON 字符串， 然后解析json 。

得到每个对象经纬度

**/

第三步：

在地图上画圈

首先在 头文件定义 ：

 @property(nonatomic,retain)MKCircle *circle;

圈的颜色，属性

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay
{ MKOverlayView *view=nil;if ([overlay isKindOfClass:[MKCircle class]]) {MKCircleView *cirView =[[MKCircleView alloc] initWithCircle:overlay]; cirView.fillColor=[UIColor redColor]; cirView.strokeColor=[UIColor redColor]; cirView.alpha=0.1;cirView.lineWidth=4.0;view=[cirView autorelease];} return view;
}

第四步：

显示自己位置和为地图添加标注

@interface POI : NSObject<MKAnnotation>
{CLLocationCoordinate2D coordinate;NSString *subtitle;NSString *title; NSString *cofeId ; NSString *doroname;
}@property (nonatomic,readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic,copy) NSString *subtitle;
@property (nonatomic,copy) NSString *title;
@property (nonatomic,copy) NSString *xId ;
@property (nonatomic,copy) NSString *name; ;  -(id) initWithCoords:(CLLocationCoordinate2D) coords;

@implementation POI@synthesize coordinate,subtitle,title;
@synthesize xId;
@synthesize doroname;- (id) initWithCoords:(CLLocationCoordinate2D) coords{self = [super init];if (self) {coordinate = coords; }return self;}- (void) dealloc{[title release];[subtitle release]; [xId release]; [doroname release];[super dealloc];
}@end

这个网上很多， 可以根据需求自己适当修改 。

     doors=[jsonDic objectForKey:@"roomshops"];    for (NSDictionary *dic in doors) { CLLocationCoordinate2D  p1;   p1.latitude= [[dic objectForKey:@"roomLng"] doubleValue]; p1.longitude=[[dic objectForKey:@"roomLat"] doubleValue];POI *poi = [[[POI alloc] initWithCoords:p1] autorelease];  poi.title=[dic objectForKey:@"roomName"];poi.subtitle=[dic objectForKey:@"roomAddress"];  poi.xId= [dic objectForKey:@"roomid"]; poi.doroname=[dic objectForKey:@"room"];[mapView addAnnotation:poi];}

解析json。

这里要说明以下， google地图先纬度，再经度。 而一般我们都是先经度，再纬度。

地图标注 ：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation { /// 判断是否是自己if ([annotation isKindOfClass:[POI class]]) {MKAnnotationView *view = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:[annotation title] ]; if (view==nil) {view= [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:[annotation title]] autorelease]; } else{view.annotation=annotation;} POI *pview= annotation;  if ([pview.doroname isEqual:@"你大爷"]) {[view setImage:[UIImage imageNamed:@"poi.png"]]; view.canShowCallout=YES; UIButton *btn = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];view.rightCalloutAccessoryView=btn;}  else{[view setImage:[UIImage imageNamed:@"大小_选中.png"]]; view.canShowCallout=YES; UIButton *btn = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];view.rightCalloutAccessoryView=btn;}return  view;} else{ POI *Mapannotation = annotation; Mapannotation.title=@"当前位置"; return nil;  }}

截图说明，因为我圈是加在中间的， 所以会这样。