地图导航划线

简单是ios地图划线事例 有上一篇关于地图的注释，着个应该很清楚了

////  ViewController.m//  2014_11_03_地图划线////  Created by Mac10.9 on 14-11-3.//  Copyright (c) 2014年 xiaoxiaobing. All rights reserved.//#import "ViewController.h"#import <MapKit/MapKit.h>#import <CoreLocation/CoreLocation.h>#import "XXBAnnotation.h"@interface ViewController ()<MKMapViewDelegate,CLLocationManagerDelegate]] >//为了开启定位服务员@property (nonatomic, strong) CLLocationManager *locMgr;@property (weak, nonatomic) IBOutlet MKMapView *mapView;@property (nonatomic, strong) CLGeocoder *geocoder;@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    [self setupCLLocationManager];    [self setupMapView];}/** *  懒加载 */- (CLLocationManager *)locMgr{#warning 定位服务不可用    if(![CLLocationManager locationServicesEnabled])    {        /**         只有系统的定位功能是关闭的时候才会调用这个方法         */        return nil;    }       if (!_locMgr)    {        // 创建定位管理者        self.locMgr = [[CLLocationManager alloc] init];        // 设置代理        self.locMgr.delegate = self;    }    return _locMgr;}- (void)setupCLLocationManager{    // 开始定位用户的位置    [self.locMgr startUpdatingLocation];    [self.locMgr requestAlwaysAuthorization];}- (CLGeocoder *)geocoder{    if (!_geocoder) {        self.geocoder = [[CLGeocoder alloc] init];    }    return _geocoder;}- (void)setupMapView{    self.mapView.delegate = self;       NSString *address1 = @"北京";    NSString *address2 = @"广州";       [self.geocoder geocodeAddressString:address1 completionHandler:^(NSArray *placemarks, NSError *error) {        if (error) return;               CLPlacemark *fromPm = [placemarks firstObject];               [self.geocoder geocodeAddressString:address2 completionHandler:^(NSArray *placemarks, NSError *error) {            if (error) return;                       CLPlacemark *toPm = [placemarks firstObject];                       [self addLineFrom:fromPm to:toPm];        }];    }];}/** *  添加导航的线路 * *  @param fromPm 起始位置 *  @param toPm   结束位置 */- (void)addLineFrom:(CLPlacemark *)fromPm to:(CLPlacemark *)toPm{    // 1.添加2个大头针    XXBAnnotation *fromAnno = [[XXBAnnotation alloc] init];    fromAnno.coordinate = fromPm.location.coordinate;    fromAnno.title = fromPm.name;    [self.mapView addAnnotation:fromAnno];       XXBAnnotation *toAnno = [[XXBAnnotation alloc] init];    toAnno.coordinate = toPm.location.coordinate;    toAnno.title = toPm.name;    [self.mapView addAnnotation:toAnno];       // 2.查找路线       // 方向请求    MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];    // 设置起点    MKPlacemark *sourcePm = [[MKPlacemark alloc] initWithPlacemark:fromPm];    request.source = [[MKMapItem alloc] initWithPlacemark:sourcePm];       // 设置终点    MKPlacemark *destinationPm = [[MKPlacemark alloc] initWithPlacemark:toPm];    request.destination = [[MKMapItem alloc] initWithPlacemark:destinationPm];       // 方向对象    MKDirections *directions = [[MKDirections alloc] initWithRequest:request];       // 计算路线    [directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {        NSLog(@"总共%lu条路线", (unsigned long)response.routes.count);               // 遍历所有的路线        for (MKRoute *route in response.routes) {            // 添加路线遮盖            [self.mapView addOverlay:route.polyline];        }    }];}#pragma mark - MKMapViewDelegate- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{    MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];    renderer.strokeColor = [UIColor redColor];    return renderer;}@end