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1、在mapView上绘制路线

#import "ViewController.h"
#import "Annotation.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController () <MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property (nonatomic, strong) CLGeocoder *geocoder;
@end

@implementation ViewController

- (CLGeocoder *)geocoder
{
    if (!_geocoder) {
        self.geocoder = [[CLGeocoder alloc] init];
    }
    return _geocoder;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    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
    Annotation *fromAnno = [[Annotation alloc] init];
    fromAnno.coordinate = fromPm.location.coordinate;
    fromAnno.title = fromPm.name;
    [self.mapView addAnnotation:fromAnno];
    
    Annotation *toAnno = [[Annotation 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%d条路线", 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

2、调用系统地图导航

#import "MJViewController.h"
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>

@interface MJViewController ()
@property (strong, nonatomic) CLGeocoder *geocoder;
@property (weak, nonatomic) IBOutlet UITextField *startField;
@property (weak, nonatomic) IBOutlet UITextField *endField;
- (IBAction)current;
- (IBAction)startNavigation;

@end

@implementation MJViewController
- (CLGeocoder *)geocoder
{
    if (_geocoder == nil) {
        self.geocoder = [[CLGeocoder alloc] init];
    }
    return _geocoder;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
}

- (IBAction)current {
    
}

- (IBAction)startNavigation {
    [self.geocoder geocodeAddressString:self.endField.text completionHandler:^(NSArray *placemarks, NSError *error) {
        if (error) return;
        
        CLPlacemark *placemark = [placemarks firstObject];
        
        MKMapItem *currentLocation = [MKMapItem mapItemForCurrentLocation];
        MKMapItem *toLocation = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithPlacemark:placemark]];
        
        NSMutableDictionary *options = [NSMutableDictionary dictionary];
        options[MKLaunchOptionsDirectionsModeKey] = MKLaunchOptionsDirectionsModeDriving;
        options[MKLaunchOptionsShowsTrafficKey] = @YES;
        [MKMapItem openMapsWithItems:@[currentLocation, toLocation] launchOptions:options];
    }];
}
@end