在mapview iOS 6中绘制折线
您好我正在做一个应用程序，必须显示与路线的地图。 我parsing了Json以获取绘制折线的点。 我在网上find了一个代码来绘制这条折线。 代码我发现它在这个链接： http : //iosguy.com/2012/05/22/tracing-routes-with-mapkit/
它说“创buildMKPolyline批注”我试图导入这个在我的应用程序，但我有问题来创build坐标的数组。 我的方法是这样的：
- (void)createMKpolylineAnnotation { NSInteger numberOfSteps = self.path.count; CLLocationCoordinate2D *coords = malloc(sizeof(CLLocationCoordinate2D) * numberOfSteps); for (NSInteger index = 0; index < numberOfSteps; index++) { CLLocation *location = [self.path objectAtIndex:index]; CLLocationCoordinate2D coordinate = location.coordinate; coords[index] = coordinate; } MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:coords count:numberOfSteps]; [self.mapView addOverlay:polyLine]; } 当我试图只看第一次设定坐标的价值时，为什么呢？ 你能帮我解决这个问题，或者我应该在另一种模式？
我在这里发布处理地图视图的视图控制器的代码。
MapViewController.h
#import <UIKit/UIKit.h> #import <MapKit/MapKit.h> @interface MapViewController : UIViewController <MKMapViewDelegate> @property (weak, nonatomic) IBOutlet MKMapView *mapView; @property (nonatomic, strong) NSString *fromCity; @property (nonatomic, strong) NSString *toCity; - (IBAction)chooseKindOfMap:(id)sender; @end
MapViewController.m
#import "MapViewController.h" #import "AppDelegate.h" #import "PlaceAnnotation.h" @interface MapViewController () @property (nonatomic, strong)NSMutableArray *mapAnnotation; @property (nonatomic) BOOL needUpdateRegion; @property (nonatomic, strong)NSMutableArray *path; @end @implementation MapViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; [self parseGoogleJsonToObtainPointsForPolyline]; [self.mapView setDelegate:self]; self.needUpdateRegion = YES; //[self centerMap]; self.mapAnnotation = [[NSMutableArray alloc]initWithCapacity:2]; AppDelegate *appDelegate = (AppDelegate*)[[UIApplication sharedApplication]delegate]; NSLog(@"%d", appDelegate.dataForMap.count); NSArray* coords = [self getCoords:appDelegate.dataForMap]; NSLog(@"coords = %@", coords); PlaceAnnotation *fromPlace = [[PlaceAnnotation alloc] initWithCoordinateAndName:coords[0] andLong:coords[1] andName:self.fromCity]; PlaceAnnotation *toPlace = [[PlaceAnnotation alloc] initWithCoordinateAndName:coords[2] andLong:coords[3] andName:self.toCity]; [self.mapAnnotation insertObject:fromPlace atIndex:0]; [self.mapAnnotation insertObject:toPlace atIndex:1]; NSLog(@"mapAnnotation.count: %d", self.mapAnnotation.count); if (self.mapAnnotation) { [self.mapView removeAnnotations:self.mapView.annotations]; } [self.mapView addAnnotation:self.mapAnnotation[0]]; [self.mapView addAnnotation:self.mapAnnotation[1]]; NSLog(@"MapAnnotation = %@", self.mapView.annotations); [self updateRegion]; [self createMKpolylineAnnotation]; } //- (void)viewDidAppear:(BOOL)animated { // [super viewDidAppear:animated]; // if (self.needUpdateRegion) [self updateRegion]; //} - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation { MKPinAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil]; pin.pinColor = MKPinAnnotationColorRed; return pin; } - (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views { MKPinAnnotationView *ulv = [mapView viewForAnnotation:mapView.userLocation]; ulv.hidden = YES; } - (NSArray*)getCoords:(NSDictionary*)data { NSArray *legs = [data objectForKey:@"legs"]; NSDictionary *firstZero = [legs objectAtIndex:0]; NSDictionary *endLocation = [firstZero objectForKey:@"end_location"]; NSDictionary *startLocation = [firstZero objectForKey:@"start_location"]; NSString *latFrom = [startLocation objectForKey:@"lat"]; NSString *lngFrom = [startLocation objectForKey:@"lng"]; NSString *latTo = [endLocation objectForKey:@"lat"]; NSString *lngTo = [endLocation objectForKey:@"lng"]; return @[latFrom,lngFrom,latTo,lngTo]; } - (void)centerMap { MKCoordinateRegion region; region.center.latitude = 41.178654; region.center.longitude = 11.843262; region.span.latitudeDelta = 11.070406; region.span.longitudeDelta = 12.744629; [self.mapView setRegion:region]; } - (IBAction)chooseKindOfMap:(id)sender { if ([sender tag] == 0) { self.mapView.mapType = MKMapTypeStandard; } if ([sender tag] == 1) { self.mapView.mapType = MKMapTypeSatellite; } if ([sender tag] == 2) { self.mapView.mapType = MKMapTypeHybrid; } } - (void)updateRegion { self.needUpdateRegion = NO; CGRect boundingRect; BOOL started = NO; for (id <MKAnnotation> annotation in self.mapView.annotations) { CGRect annotationRect = CGRectMake(annotation.coordinate.latitude, annotation.coordinate.longitude, 0, 0); if (!started) { started = YES; boundingRect = annotationRect; } else { boundingRect = CGRectUnion(boundingRect, annotationRect); } } if (started) { boundingRect = CGRectInset(boundingRect, -0.2, -0.2); if ((boundingRect.size.width < 20) && (boundingRect.size.height < 20)) { MKCoordinateRegion region; region.center.latitude = boundingRect.origin.x + boundingRect.size.width / 2; region.center.longitude = boundingRect.origin.y + boundingRect.size.height / 2; region.span.latitudeDelta = boundingRect.size.width; region.span.longitudeDelta = boundingRect.size.height; [self.mapView setRegion:region animated:YES]; } } } - (void)parseGoogleJsonToObtainPointsForPolyline { NSDictionary *polyline; NSMutableArray *points = [[NSMutableArray alloc]init];; AppDelegate *appDelegate = (AppDelegate*)[[UIApplication sharedApplication]delegate]; NSArray *legs = [appDelegate.dataForMap objectForKey:@"legs"]; NSDictionary *firstZero =[legs objectAtIndex:0]; NSArray *steps = [firstZero objectForKey:@"steps"]; for (int i = 0; i < steps.count; i++) { polyline = [steps[i] objectForKey:@"polyline"]; [points addObject:polyline[@"points"]]; NSLog(@"POINTS = %@", polyline[@"points"]); self.path = [self decodePolyLine:points[i]]; } NSLog(@"path = %@", self.path); } -(NSMutableArray *)decodePolyLine:(NSString *)encodedStr { NSMutableString *encoded = [[NSMutableString alloc] initWithCapacity:[encodedStr length]]; [encoded appendString:encodedStr]; [encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\" options:NSLiteralSearch range:NSMakeRange(0, [encoded length])]; NSInteger len = [encoded length]; NSInteger index = 0; NSMutableArray *array = [[NSMutableArray alloc] init]; NSInteger lat=0; NSInteger lng=0; while (index < len) { NSInteger b; NSInteger shift = 0; NSInteger result = 0; do { b = [encoded characterAtIndex:index++] - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1)); lat += dlat; shift = 0; result = 0; do { b = [encoded characterAtIndex:index++] - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1)); lng += dlng; NSNumber *latitude = [[NSNumber alloc] initWithFloat:lat * 1e-5]; NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5]; CLLocation *location = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]]; [array addObject:location]; } return array; } - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay { MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay]; polylineView.strokeColor = [UIColor redColor]; polylineView.lineWidth = 1.0; return polylineView; } - (void)createMKpolylineAnnotation { NSInteger numberOfSteps = self.path.count; CLLocationCoordinate2D *coords = malloc(sizeof(CLLocationCoordinate2D) * numberOfSteps); for (NSInteger index = 0; index < numberOfSteps; index++) { CLLocation *location = [self.path objectAtIndex:index]; CLLocationCoordinate2D coordinate = location.coordinate; coords[index] = coordinate; } MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:coords count:numberOfSteps]; [self.mapView addOverlay:polyLine]; } @end
我用AppDelegate有Json（我在另一个类中parsing它）
这里是一个教程如何添加一个折线到一个mapView。 希望这可以帮助！
编辑：
不幸的是，上面提供的链接现在已经被打破了，我无法find所指的教程。
简单的，只需复制并粘贴我的代码并修改一些variables
- (IBAction)traceRoute:(UIButton *)sender { double latDouble = 39.7540615; double lngDouble = -8.8059587; // double latDouble = [self.sheetDetail.data.locationLat doubleValue]; // double lngDouble = [self.sheetDetail.data.locationLng doubleValue]; CLLocationCoordinate2D c2D = CLLocationCoordinate2DMake(latDouble, lngDouble); MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:c2D addressDictionary:nil]; MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark]; [mapItem setName:@"Mobile Edge"]; MKPlacemark *placemark2; MKMapItem *mapItem2; if(kIS_OS_8_OR_LATER) { placemark2 = [[MKPlacemark alloc] initWithCoordinate:_userLoc addressDictionary:nil]; mapItem2 = [[MKMapItem alloc] initWithPlacemark:placemark2]; [mapItem2 setName:@"Me"]; } else { placemark2 = [[MKPlacemark alloc] initWithCoordinate:_mapView.userLocation.coordinate addressDictionary:nil]; mapItem2 = [[MKMapItem alloc] initWithPlacemark:placemark2]; [mapItem2 setName:@"Me"]; } MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init]; request.source = mapItem2; request.destination = mapItem; request.requestsAlternateRoutes = NO; MKDirections *directions = [[MKDirections alloc] initWithRequest:request]; [directions calculateDirectionsWithCompletionHandler: ^(MKDirectionsResponse *response, NSError *error) { if (error) { // Handle error [[NSNotificationCenter defaultCenter] postNotificationName:@"finishedLocationRoute" object:nil]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle: NSLocalizedString(@"Route error title", nil) message: NSLocalizedString(@"Route error", nil) delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; } else { for (MKRoute *route in response.routes) { //MKMapPoint middlePoint = route.polyline.points[route.polyline.pointCount/2]; //[self createAndAddAnnotationForCoordinate:MKCoordinateForMapPoint(middlePoint) andRoute:route]; [self.mapView addOverlay:route.polyline level:MKOverlayLevelAboveRoads]; } //notifies parent menu //[[NSNotificationCenter defaultCenter] postNotificationName:@"finishedLocationRoute" object:nil]; } }]; } - (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id)overlay { if (![overlay isKindOfClass:[MKPolygon class]]) { MKPolyline *route = overlay; MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:route]; renderer.strokeColor = [UIColor blueColor]; renderer.lineWidth = 5.0; return renderer; } else { return nil; } }