MKMapView绘制路线

#import "ViewController.h"#import <MapKit/MapKit.h>@interface ViewController ()<MKMapViewDelegate>@property (weak, nonatomic) IBOutlet MKMapView *mapView;@property (nonatomic, strong) CLGeocoder *geocoder;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    //初始化地理编码对象    self.geocoder = [CLGeocoder new];    //设置代理    self.mapView.delegate = self;}//添加遮盖物- (IBAction)addOverlay:(id)sender {    //1.给定起点和终点    NSString *startPoint = @"北京";    NSString *endPoint   = @"深圳";    //2.使用地理编码把名字转成经纬度值    [self.geocoder geocodeAddressString:startPoint completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {        //取地标数组最后一项(假定服务器返回一个)        CLPlacemark *startPlacemark = [placemarks lastObject];        //3.创建大头针对象，设置属性；添加        MKPointAnnotation *annotation = [MKPointAnnotation new];        annotation.coordinate = startPlacemark.location.coordinate;        annotation.title = @"起点";        [self.mapView addAnnotation:annotation];        //一定写在block内部        [self.geocoder geocodeAddressString:endPoint completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {            CLPlacemark *endPlacemark = [placemarks lastObject];            MKPointAnnotation *annotation = [MKPointAnnotation new];            annotation.coordinate = endPlacemark.location.coordinate;            annotation.title = @"终点";            [self.mapView addAnnotation:annotation];            [self startRoute:startPlacemark withPlacemark:endPlacemark];        }];    }];    //4.画线(添加overlay)}- (void)startRoute:(CLPlacemark *)startPlacemark withPlacemark:(CLPlacemark *)endPlacemark {    MKMapItem *sourceItem = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithPlacemark:startPlacemark]];    MKMapItem *targetItem = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithPlacemark:endPlacemark]];    //创建request对象    MKDirectionsRequest *request = [MKDirectionsRequest new];    //给request设置起点和终点    request.source = sourceItem;    request.destination = targetItem;    //创建MKDirections对象; 发送请求    MKDirections *directions = [[MKDirections alloc] initWithRequest:request];    [directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse * _Nullable response, NSError * _Nullable error) {        if (!error) {            //取出整体路线; 取出对应路线的所有steps；添加polyline            for (MKRoute *route in response.routes) {                NSLog(@"总路程:%f千米; 预计的总时间:%f小时",route.distance/1000, route.expectedTravelTime/3600);                //第一处可以添加几何线                //steps                for (MKRouteStep *step in route.steps) {                    NSLog(@"每个step描述:%@; step距离:%f", step.instructions, step.distance);                    //第二处可以添加几何线到地图视图上                    [self.mapView addOverlay:step.polyline];                }            }        }    }];}//设置线的颜色和粗细- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay {    MKPolylineRenderer *render = [[MKPolylineRenderer alloc] initWithOverlay:overlay];    render.lineWidth = 5.0;    render.strokeColor = [UIColor blueColor];    return render;}@end