IOS开发-地图 (mapkit)实验

经过一个星期，翻阅各种资料。终于达到基本要求。 记录一下， 以后备用。

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

两点相差太远， 所以会这样。