地图的覆盖层

头文件以及库类

具体的实现方法

@property (nonatomic, strong) MKMapView* mapView;

self.mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];

self.mapView.zoomEnabled = YES;

// 设置地图可滚动

self.mapView.scrollEnabled = YES;

// 设置地图不可旋转

self.mapView.rotateEnabled = NO;

// 设置地图显示用户位置

self.mapView.showsUserLocation = YES;

[self.view addSubview:self.mapView];

[self locateToLatitude:23.126272 longitude:113.395568];

// 创建一个手势处理器，用于检测、处理长按手势

UILongPressGestureRecognizer* gesture = [[UILongPressGestureRecognizer

alloc]initWithTarget:self action:@selector(longPress:)];

[self.mapView addGestureRecognizer:gesture];

self.mapView.delegate = self;

以下是自定义方法以及系统方法

- (void)locateToLatitude:(CGFloat)latitude longitude:(CGFloat)longitude{// 设置地图中心的经、纬度CLLocationCoordinate2D center = {latitude , longitude};// 设置地图显示的范围，MKCoordinateSpan span;// 地图显示范围越小，细节越清楚span.latitudeDelta = 0.01;span.longitudeDelta = 0.01;// 创建MKCoordinateRegion对象，该对象代表了地图的显示中心和显示范围。MKCoordinateRegion region = {center,span};// 设置当前地图的显示中心和显示范围[self.mapView setRegion:region animated:YES];}- (void) longPress:(UILongPressGestureRecognizer*)gesture{// 获取长按点的坐标CGPoint pos = [gesture locationInView:self.mapView];// 将长按点的坐标转换为经度、维度值CLLocationCoordinate2D coord = [self.mapView convertPoint:postoCoordinateFromView:self.mapView];// 创建MKCircle对象，该对象代表覆盖层    MKCircle* circle = [MKCircle circleWithCenterCoordinate:coord radius:100];    // 添加MKOverlay[self.mapView addOverlay:circle level:MKOverlayLevelAboveLabels];}// MKMapViewDelegate协议中的方法，该方法返回的MKOverlayRenderer负责绘制覆盖层控件- (MKOverlayRenderer *)mapView:(MKMapView *)mapViewrendererForOverlay:(id)overlay

{

MKCircle * circle = (MKCircle*)overlay;

// 创建一个MKCircleRenderer对象

MKCircleRenderer* render = [[MKCircleRenderer alloc] initWithCircle:circle];

// 设置MKCircleRenderer的透明度

render.alpha = 0.5;

// 设置MKCircleRenderer的填充颜色和边框颜色

render.fillColor = [UIColor blueColor];

render.strokeColor = [UIColor redColor];

return render;

}