在iPhone MapView上显示当前和期望位置之间的路线

Question

我想在MKMapView上以注释的形式显示当前位置和期望位置之间的路由。

最好的方法是什么?

Answer 1

///add delegate MKMapViewDelegate

///在.m文件中

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation     *)newLocation fromLocation:(CLLocation *)oldLocation
{
     CLLocationCoordinate2D newcordinate =   newLocation.coordinate;
     CLLocationCoordinate2D oldcordinate =   oldLocation.coordinate;
       MKMapPoint * pointsArray =
               malloc(sizeof(CLLocationCoordinate2D)*2);
           pointsArray[0]= MKMapPointForCoordinate(oldcordinate); 
           pointsArray[1]= MKMapPointForCoordinate(newcordinate);    
            MKPolyline *  routeLine = [MKPolyline polylineWithPoints:pointsArray count:2];
           free(pointsArray);
            [MapView addOverlay:routeLine];  //MkMapView declared in .h
}
//MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKOverlayView* overlayView = nil;

          MKPolylineView  * _routeLineView = [[[MKPolylineView alloc]                   initWithPolyline:self.routeLine] autorelease];
            _routeLineView.fillColor = self.PathColor;
           _routeLineView.strokeColor = self.PathColor;
          _routeLineView.lineWidth = 15;
            _routeLineView.lineCap = kCGLineCapSquare;

            overlayView = _routeLineView;
            return overlayView;
}

Answer 2

我尝试以下代码…它在我的项目中工作得很好……试一试. .

首先下载KMLParser.h和KMLParser。-

也可以下载DDAnnotation.h和DDAnnotation。-

现在创建一个视图控制器，如SomeViewController。

添加以下库:-

1. CoreLocation.framework
2. MapKit.framework
3. QuartzCore.framework

在SomeViewController.h导入KMLParser.h文件

在SomeViewController.h

中编写以下代码

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import "KMLParser.h"
@interface SomeViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate, MKOverlay>{
    double currentLat;
    double currentLong;
    double desiredLatitude;
    double desiredLongitude;
    MKMapView *mapView;
    KMLParser *kml;
    NSMutableArray *annotations;
} @property(nonatomic, retain)IBOutlet MKMapView *mapView;
@end

现在在SomeViewController。xib拖拽MapView，并从文件的所有者给它链接MapView。同时设置MapView的委托给File的所有者。

现在在SomeViewController中编写以下代码:-

#import "SomeViewController.h"
#import <QuartzCore/QuartzCore.h>
#import "DDAnnotation.h"
@implementation SomeViewController
@synthesize mapView;
- (void)viewDidLoad {
    [super viewDidLoad];
    currentLat = 21.215538; //You can set current latitude here. 
    currentLong = 72.858753; //You can set current longitude here.
    desiredLatitude = 21.211976; //You can set destination latitude here.
    desiredLongitude = 72.851593; //You can set destination longitude here.
    MKCoordinateRegion region = {{0.0f, 0.0f}, {100.0f, 100.0f}};
    CLLocation* currentLocation = [[CLLocation alloc] initWithLatitude:currentLat longitude:currentLong];
    region.center = currentLocation.coordinate;
    region.span.longitudeDelta = 0.05;
    region.span.latitudeDelta  = 0.05;
    [self.mapView setRegion:region animated:YES];
    annotations=[[NSMutableArray alloc] init];
    CLLocationCoordinate2D theCoordinate;
    theCoordinate.latitude = currentLat;
    theCoordinate.longitude = currentLong;
    DDAnnotation* myAnnotation=[[DDAnnotation alloc] init];
    myAnnotation.coordinate=theCoordinate;
    myAnnotation.title=@"You are here";
    myAnnotation.subtitle=@"Current location";
    [mapView addAnnotation:myAnnotation];
    [annotations addObject:myAnnotation];
    CLLocationCoordinate2D theCoordinate1;
    theCoordinate1.latitude = desiredLatitude;
    theCoordinate1.longitude = desiredLongitude;
    DDAnnotation* myAnnotation1=[[DDAnnotation alloc] init];
    myAnnotation1.coordinate=theCoordinate1;
    myAnnotation1.title=@"Desired Location's Title";
    myAnnotation1.subtitle= @"Desired Location's Sub-title";
    [mapView addAnnotation:myAnnotation1];
    [annotations addObject:myAnnotation1];
    NSString *path = [NSString stringWithFormat:@"http://maps.google.com/maps?f=d&hl=en&saddr=%f,%f&daddr=%f,%f&ie=UTF8&0&om=0&output=kml",currentLat,currentLong,desiredLatitude,desiredLongitude];
    NSLog(@" Path String : %@", path); 
    kml = [[KMLParser alloc] initWithURL:[NSURL URLWithString:path]];
    [kml parseKML];
    // Add all of the MKOverlay objects parsed from the KML file to the map.
    NSArray *overlays = [kml overlays];
    [self.mapView addOverlays:overlays];
}

#pragma mark MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    return [kml viewForOverlay:overlay];
}
- (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation{
    // if it's the user location, just return nil.
    if ([annotation isKindOfClass:[MKUserLocation class]]){
        return nil;
    }
    else{
        static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
        MKPinAnnotationView* pinView = [[[MKPinAnnotationView alloc]
                                         initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
        pinView.animatesDrop=YES;
        pinView.canShowCallout=YES;
        pinView.pinColor=MKPinAnnotationColorGreen;

        return pinView;
    }   
}

Answer 3

你必须自己计算路径点，并将路线绘制为一个图层。在MKMapView中没有显示路由的公共api。

最快的解决方法是打开带路线的手机地图应用。