#import "ViewController.h"#import 
     
      #import 
      
       @interface ViewController ()
       
        @property(nonatomic ,strong)MKMapView * map;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    MKMapView * map = [[MKMapView alloc]initWithFrame:self.view.bounds];      self.map = map;        self.map.delegate = self;        [self.view addSubview:map];                CLGeocoder * geoCode = [[CLGeocoder alloc]init];        [geoCode geocodeAddressString:@"北京" completionHandler:^(NSArray
        
          * _Nullable placemarks, NSError * _Nullable error) {                //通过coreLocation 的CLPlacemark 获取地面 装换为MKPlacemark                MKPlacemark * place1 = [[MKPlacemark alloc]initWithPlacemark:[placemarks firstObject]];                    [geoCode geocodeAddressString:@"武汉" completionHandler:^(NSArray
         
           * _Nullable placemarks, NSError * _Nullable error) {                        MKPlacemark * place2 = [[MKPlacemark alloc]initWithPlacemark:[placemarks firstObject]];                        //创建方向请求            MKDirectionsRequest * request = [[MKDirectionsRequest alloc]init];                        request.source = [[MKMapItem alloc]initWithPlacemark:place1];                        request.destination = [[MKMapItem alloc]initWithPlacemark:place2];                        //创建方向对象            MKDirections * direction = [[MKDirections alloc]initWithRequest:request];                        //计算方向 添加蒙版 也就是划线             [direction calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse * _Nullable response, NSError * _Nullable error) {                                  for (MKRoute * route in response.routes) {                                          [self.map addOverlay:route.polyline];                          }                                               }];                                  }];    }];}//当添加折线时,调用 , 返回一个折线渲染器-(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id
          
           )overlay{ MKPolylineRenderer * polylineRenderer = [[MKPolylineRenderer alloc]initWithPolyline:overlay]; polylineRenderer.lineWidth = 2; polylineRenderer.strokeColor = [UIColor orangeColor]; return polylineRenderer; }