要通過(guò)蘋(píng)果的服務(wù)器獲得導(dǎo)航數(shù)據(jù)，利用系統(tǒng)自帶的類(lèi)即可實(shí)現(xiàn)，先創(chuàng)建MKDirectionsRequest，然后利用request創(chuàng)建MKDirections，最后調(diào)用MKDirection對(duì)象的calculateDirectionsWithCompletionHandler:方法，該方法通過(guò)一個(gè)結(jié)構(gòu)體回調(diào)，來(lái)獲取導(dǎo)航信息。

結(jié)構(gòu)體傳入的參數(shù)是MKDirectionsResponse對(duì)象，其中routes包含的是路徑，一般只有一條，就是從起點(diǎn)通往終點(diǎn)的路線(xiàn)，在route里還包含step，每個(gè)step是路徑中的一小部分，利用for-in進(jìn)行遍歷即可。

需要注意的是，request在請(qǐng)求之前需要傳入起點(diǎn)和終點(diǎn)，屬性名為source和destination，接收MKMapItem對(duì)象，要得到MKMapItem，應(yīng)該先得到MKPlacemark，要得到MKPlacemark，首先應(yīng)當(dāng)利用地理編碼得到CLPlacemark，然后利用CLPlacemark初始化MKPlacemark。這個(gè)在上一節(jié)有講，這里不再贅述。

- (void)startNavigation{MKPlacemark *startMrk = [[MKPlacemark alloc] initWithPlacemark:_startMrk];MKPlacemark *endMrk = [[MKPlacemark alloc] initWithPlacemark:_endMrk];MKMapItem *startItem = [[MKMapItem alloc] initWithPlacemark:startMrk];MKMapItem *endItem = [[MKMapItem alloc] initWithPlacemark:endMrk];MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];request.source = startItem;request.destination = endItem;MKDirections *directions = [[MKDirections alloc] initWithRequest:request];[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {if(error){return;}for (MKRoute *route in response.routes) {NSLog(@"%@ %fkm %fh",route.name,route.distance / 1000,route.expectedTravelTime / 3600);// 繪制路線(xiàn)，通過(guò)向地圖上添加遮蓋（蒙板）// 系統(tǒng)開(kāi)始繪制路徑時(shí)，會(huì)詢(xún)問(wèn)路徑的屬性，寬度、顏色等。[_mapView addOverlay:route.polyline];for (MKRouteStep *step in route.steps) {NSLog(@"%@ %f",step.instructions,step.distance);}}}];} 觀察上面的代碼，對(duì)于路徑，可以通過(guò)mapView的addOverlay:方法傳入一個(gè)MKPolyline對(duì)象即可實(shí)現(xiàn)向地圖上添加路徑。

需要注意的是，繪制路徑之前系統(tǒng)會(huì)調(diào)用mapView的代理方法，詢(xún)問(wèn)路徑繪制的細(xì)節(jié)，如果不實(shí)現(xiàn)這個(gè)方法，無(wú)法繪制路徑，首先讓控制器成為mapView的代理，然后實(shí)現(xiàn)下面的方法，設(shè)置路徑樣式。

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{MKPolylineRenderer *pathRender = [[MKPolylineRenderer alloc] initWithOverlay:overlay];pathRender.lineWidth = 6;pathRender.lineJoin = kCGLineJoinRound;pathRender.strokeColor = [UIColor redColor];return pathRender;}

一般要在起點(diǎn)和終點(diǎn)放置大頭針，只需要定義模型遵循MKAnnotation協(xié)議，然后創(chuàng)建模型，調(diào)用mapView的addAnnotation:方法即可放置大頭針，樣式為默認(rèn)。這個(gè)方法應(yīng)該在地理編碼獲取到終點(diǎn)回調(diào)時(shí)添加，下面是完整的代碼。

// // ViewController.m // 通過(guò)蘋(píng)果服務(wù)器獲取導(dǎo)航信息 // // Created by 11 on 7/22/15. // Copyright (c) 2015 soulghost. All rights reserved. //#import "ViewController.h" #import <MapKit/MapKit.h> #import "MyAnnotation.h"@interface ViewController () <MKMapViewDelegate> @property (weak, nonatomic) IBOutlet UITextField *startView; @property (weak, nonatomic) IBOutlet UITextField *endView; @property (strong, nonatomic) CLGeocoder *gcoder; @property (strong, nonatomic) CLPlacemark *startMrk,*endMrk; @property (weak, nonatomic) IBOutlet MKMapView *mapView;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];_gcoder = [[CLGeocoder alloc] init];_mapView.delegate = self;}- (IBAction)startBtnClick:(id)sender {NSString *start = _startView.text;NSString *end = _endView.text;[_gcoder geocodeAddressString:start completionHandler:^(NSArray *placemarks, NSError *error) {if(placemarks.count) _startMrk = [placemarks firstObject];else return;[_gcoder geocodeAddressString:end completionHandler:^(NSArray *placemarks, NSError *error) {if(placemarks.count) _endMrk = [placemarks firstObject];else return;[self startNavigation];// 添加起點(diǎn)和終點(diǎn)的大頭針MyAnnotation *startAnnotation = [[MyAnnotation alloc] init];startAnnotation.title = _startMrk.locality;startAnnotation.subtitle = _startMrk.name;startAnnotation.coordinate = _startMrk.location.coordinate;[_mapView addAnnotation:startAnnotation];MyAnnotation *endAnnotation = [[MyAnnotation alloc] init];endAnnotation.title = _endMrk.locality;endAnnotation.subtitle = _endMrk.name;endAnnotation.coordinate = _endMrk.location.coordinate;[_mapView addAnnotation:endAnnotation];}];}];}- (void)startNavigation{MKPlacemark *startMrk = [[MKPlacemark alloc] initWithPlacemark:_startMrk];MKPlacemark *endMrk = [[MKPlacemark alloc] initWithPlacemark:_endMrk];MKMapItem *startItem = [[MKMapItem alloc] initWithPlacemark:startMrk];MKMapItem *endItem = [[MKMapItem alloc] initWithPlacemark:endMrk];MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];request.source = startItem;request.destination = endItem;MKDirections *directions = [[MKDirections alloc] initWithRequest:request];[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {if(error){return;}for (MKRoute *route in response.routes) {NSLog(@"%@ %fkm %fh",route.name,route.distance / 1000,route.expectedTravelTime / 3600);// 繪制路線(xiàn)，通過(guò)向地圖上添加遮蓋（蒙板）// 系統(tǒng)開(kāi)始繪制路徑時(shí)，會(huì)詢(xún)問(wèn)路徑的屬性，寬度、顏色等。[_mapView addOverlay:route.polyline];for (MKRouteStep *step in route.steps) {NSLog(@"%@ %f",step.instructions,step.distance);}}}];}// 繪制路徑的樣式 - (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{MKPolylineRenderer *pathRender = [[MKPolylineRenderer alloc] initWithOverlay:overlay];pathRender.lineWidth = 6;pathRender.lineJoin = kCGLineJoinRound;pathRender.strokeColor = [UIColor redColor];return pathRender;}@end

轉(zhuǎn)載于:https://www.cnblogs.com/aiwz/p/6154117.html

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