Oc 地图覆盖层

屏幕快照 2017-08-05 08.05.00.png

实现代码

#import 
#import "FKViewController.h"

@interface FKViewController () 
@property (nonatomic, strong) MKMapView* mapView;
@end
@implementation FKViewController
- (void)viewDidLoad
{
    [super viewDidLoad];
    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;
}
- (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:pos
        toCoordinateFromView: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 *)mapView
    rendererForOverlay:(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;
}
@end