位置与地图(三)给地图添加覆盖层

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.    self.mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];    self.mapView.mapType = MKMapTypeStandard;    self.mapView.scrollEnabled = YES;    //  设置地图不可旋转    self.mapView.rotateEnabled = NO;    self.mapView.zoomEnabled = YES;    self.mapView.showsUserLocation = YES;        //  设置地图中心的经纬度    CLLocationCoordinate2D center = {39.910650,116.47030};    //  设置地图显示的范围,数值越小细节越清楚    MKCoordinateSpan span = {0.01,0.01};    //  二者合一设置显示区域    MKCoordinateRegion region = {center,span};    [self.mapView setRegion:region animated:YES];    [self.view addSubview:self.mapView];        UILongPressGestureRecognizer *longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];    [self.mapView addGestureRecognizer:longGesture];        //  设置代理    self.mapView.delegate = self;    }- (void)longPress:(UILongPressGestureRecognizer *)longGesture{        //  获取长按点得坐标    CGPoint postion = [longGesture locationInView:self.mapView];    //  将长按点坐标转换为经纬度    CLLocationCoordinate2D coord2D = [self.mapView convertPoint:postion toCoordinateFromView:self.mapView];    //  创建一个圆形覆盖层对象    MKCircle *circle = [MKCircle circleWithCenterCoordinate:coord2D radius:100];    //  将单个的覆盖层添加到指定的层级    [self.mapView addOverlay:circle level:MKOverlayLevelAboveLabels];    }//  该方法返回的MKOverlayRenderer负责绘制覆盖层控件- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{    MKCircle *circle = (MKCircle *)overlay;    // iOS7之后,推荐使用MKXxxRenderer来负责渲染覆盖层控件    MKCircleRenderer *circleRend = [[MKCircleRenderer alloc] initWithCircle:circle];    circleRend.alpha = 0.3;    //  填充颜色    circleRend.fillColor = [UIColor blueColor];    //  边框颜色    circleRend.strokeColor = [UIColor redColor];        return circleRend;}/*********iOS7新增的MKTileOverlay覆盖层*******************************************- (void)longPress:(UILongPressGestureRecognizer *)longGesture{        //  指定本地图片覆盖    NSURL *url = [[NSBundle mainBundle] URLForResource:@"hmt" withExtension:@"png"];    MKTileOverlay *tileOverlay = [[MKTileOverlay alloc] initWithURLTemplate:[url description]];    [self.mapView addOverlay:tileOverlay];    }//  该方法返回的MKOverlayRenderer负责绘制覆盖层控件- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{        MKTileOverlayRenderer *tileRender = [[MKTileOverlayRenderer alloc] initWithOverlay:(MKTileOverlay *)overlay];    tileRender.alpha = 0.2;    return circleRend;}*/