if (IOS7) {
//      [_mapView setRegion:MKCoordinateRegionMake(_start2D, MKCoordinateSpanMake(0.05, 0.05))];_routes = [self calculateRoutesFrom:_start2D to:_end2D] ;[self centerMap:_routes];//    //规划地图路径
       [self requestRoutWithSoure:_start2D Destination:_end2D];}else{_routeView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, _mapView.frame.size.width, _mapView.frame.size.height)];_routeView.userInteractionEnabled = NO;[_mapView addSubview:_routeView];if(_routes) {[_mapView removeAnnotations:[_mapView annotations]];}_routes = [self calculateRoutesFrom:_start2D to:_end2D] ;//根据数组画线
        [self updateRouteView:_routes RouteView:_routeView];//根据线路确定呈现范围
        [self centerMap:_routes];}

#pragma mark - 请求路径
-(void)requestRoutWithSoure:(CLLocationCoordinate2D) start2D  Destination:(CLLocationCoordinate2D)end2D
{MKDirectionsRequest *directionsRequest = [[MKDirectionsRequest alloc] init];directionsRequest.transportType = MKDirectionsTransportTypeAutomobile;MKPlacemark *startMark = [[MKPlacemark    alloc] initWithCoordinate:start2D addressDictionary:nil];MKPlacemark *endMark = [[MKPlacemark    alloc] initWithCoordinate:end2D addressDictionary:nil];MKMapItem *startItem = [[MKMapItem alloc] initWithPlacemark:startMark];MKMapItem *endItem = [[MKMapItem alloc] initWithPlacemark:endMark];[directionsRequest setSource:startItem];[directionsRequest setDestination:endItem];MKDirections *directions = [[MKDirections alloc] initWithRequest:directionsRequest];//接收rout[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {if (!response) {return ;}_routes  = [response routes];[_routes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {MKRoute *rout = obj;MKPolyline *line = [rout polyline];[_mapView addOverlay:line];}];//根据 routes  数据 确定region的呈现范围//[self centerMap:_routes];
}];
}

#pragma mark - ios7  mapView delegate
- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id<MKAnnotation>)annotation {MKAnnotationView *annView;if (annotation == _startPoint) {//标注annView = [[MKAnnotationView alloc] initWithAnnotation:_startPoint reuseIdentifier:@"_start2D"];annView.image= [UIImage imageNamed:@"start_location"];}if (annotation == _endPoint) {annView = [[MKAnnotationView alloc] initWithAnnotation:_endPoint reuseIdentifier:@"_end2D"];annView.image= [UIImage imageNamed:@"end_location"];}return annView;
}-(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];renderer.strokeColor = lineColor;renderer.lineWidth = lineW;return  renderer;
}

#pragma mark - ios6 mapView-(NSArray*) calculateRoutesFrom:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t {NSString* saddr;NSString* daddr;saddr = [NSString stringWithFormat:@"%f,%f", f.latitude, f.longitude];daddr = [NSString stringWithFormat:@"%f,%f", t.latitude, t.longitude];NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.google.com/maps?output=dragdir&saddr=%@&daddr=%@", saddr, daddr];NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:nil];NSString *encodedPoints = [apiResponse stringByMatching:@"points:\\\"([^\\\"]*)\\\"" capture:1L];return [self decodePolyLine:[encodedPoints mutableCopy]:f to:t];
}
//解码
-(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded :(CLLocationCoordinate2D)f to: (CLLocationCoordinate2D) t {[encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\"options:NSLiteralSearchrange: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 *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue]longitude:[longitude floatValue]];[array addObject:loc];}CLLocation *first = [[CLLocation alloc] initWithLatitude:[[NSNumber numberWithFloat:f.latitude] floatValue]longitude:[[NSNumber numberWithFloat:f.longitude] floatValue] ];CLLocation *end = [[CLLocation alloc] initWithLatitude:[[NSNumber numberWithFloat:t.latitude] floatValue]longitude:[[NSNumber numberWithFloat:t.longitude] floatValue] ];[array insertObject:first atIndex:0];[array addObject:end];return array;
}
//用routes数组的内容 确定region的呈现范围
-(void) centerMap:(NSArray *)routesArr {MKCoordinateRegion region;CLLocationDegrees maxLat = -90;CLLocationDegrees maxLon = -180;CLLocationDegrees minLat = 90;CLLocationDegrees minLon = 180;for(int idx = 0; idx < routesArr.count; idx++){CLLocation* currentLocation = [routesArr objectAtIndex:idx];if(currentLocation.coordinate.latitude > maxLat)maxLat = currentLocation.coordinate.latitude;if(currentLocation.coordinate.latitude < minLat)minLat = currentLocation.coordinate.latitude;if(currentLocation.coordinate.longitude > maxLon)maxLon = currentLocation.coordinate.longitude;if(currentLocation.coordinate.longitude < minLon)minLon = currentLocation.coordinate.longitude;}region.center.latitude     = (maxLat + minLat) / 2;region.center.longitude    = (maxLon + minLon) / 2;region.span.latitudeDelta  = maxLat - minLat;region.span.longitudeDelta = maxLon - minLon;[_mapView setRegion:region animated:YES];
}//用routes数组的内容  在 UIImageView 上画线
-(void) updateRouteView:(NSArray *)routesArr RouteView:(UIImageView *)routeImg {CGContextRef context = CGBitmapContextCreate(nil,routeImg.frame.size.width,routeImg.frame.size.height,8,4 * routeImg.frame.size.width,CGColorSpaceCreateDeviceRGB(),kCGImageAlphaPremultipliedLast);CGContextSetStrokeColorWithColor(context, lineColor.CGColor);CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);CGContextSetLineWidth(context, lineW);for(int i = 0; i < routesArr.count; i++) {CLLocation* location = [routesArr objectAtIndex:i];CGPoint point = [_mapView convertCoordinate:location.coordinate toPointToView:routeImg];if(i == 0) {CGContextMoveToPoint(context, point.x, routeImg.frame.size.height - point.y);} else {CGContextAddLineToPoint(context, point.x, routeImg.frame.size.height - point.y);}}CGContextStrokePath(context);CGImageRef image = CGBitmapContextCreateImage(context);UIImage* img = [UIImage imageWithCGImage:image];routeImg.image = img;CGContextRelease(context);}#pragma mark mapView delegate functions
- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated
{

if (!IOS7)

    _routeView.hidden = YES;
}- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{

if (!IOS7){

    [self updateRouteView:_routes RouteView:_routeView];_routeView.hidden = NO;[_routeView setNeedsDisplay];}
}