我想找到两个坐标之间的道路距离。首先，我从用户那里获取源和目的地，然后使用googleMap api找到坐标。
我能够找到坐标和空中距离，但我无法找到道路距离并在它们之间绘制折线。谷歌上可用的每种方法都适用于较旧的xcode，xcode 6不支持。
我用于查找坐标的方法
-(CLLocationCoordinate2D)FindCoordinates:(NSString *)place
{
NSString *addresss = place;
NSString *esc_addr = [addresss stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
NSString *req = [NSString stringWithFormat: @"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:req]];
NSDictionary *googleResponse = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSDictionary *resultsDict = [googleResponse valueForKey: @"results"]; // get the results dictionary
NSDictionary *geometryDict = [ resultsDict valueForKey: @"geometry"]; // geometry dictionary within the results dictionary
NSDictionary *locationDict = [ geometryDict valueForKey: @"location"]; // location dictionary within the geometry dictionary
// nslo (@”– returning latitude & longitude from google –”);
NSArray *latArray = [locationDict valueForKey: @"lat"]; NSString *latString = [latArray lastObject]; // (one element) array entries provided by the json parser
NSArray *lngArray = [locationDict valueForKey: @"lng"]; NSString *lngString = [lngArray lastObject]; // (one element) array entries provided by the json parser
myLocation.latitude = [latString doubleValue]; // the json parser uses NSArrays which don’t support “doubleValue”
myLocation.longitude = [lngString doubleValue];
return myLocation;
}
我用来寻找距离的方法
-(IBAction)getLocation:(id)sender
{
sourceLocation = [self FindCoordinates:source1.text];
NSLog(@"%@",[NSString stringWithFormat:@"Source lat:%f Source lon:%f",sourceLocation.latitude,sourceLocation.longitude]);
destinationLocation = [self getMe:destination1.text];
NSLog(@"%@",[NSString stringWithFormat:@"Desti lat:%f Desti lon:%f",destinationLocation.latitude,destinationLocation.longitude]);
CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:sourceLocation.latitude longitude:sourceLocation.longitude];
CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:destinationLocation.latitude longitude:destinationLocation.longitude];
CLLocationDistance distance = [loc1 distanceFromLocation:loc2];
NSLog(@"%@",[NSString stringWithFormat:@"Distance iin KMeteres %f",distance/1000]); // Gives me air distance
MKPlacemark *source = [[MKPlacemark alloc]initWithCoordinate:CLLocationCoordinate2DMake(37.776142, -122.424774) addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ]; // Not able to modify these cordinates
MKMapItem *srcMapItem = [[MKMapItem alloc]initWithPlacemark:source];
[srcMapItem setName:@""];
MKPlacemark *destination = [[MKPlacemark alloc]initWithCoordinate:CLLocationCoordinate2DMake(37.73787, -122.373962) addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ];
MKMapItem *distMapItem = [[MKMapItem alloc]initWithPlacemark:destination];
[distMapItem setName:@""];
MKDirectionsRequest *request = [[MKDirectionsRequest alloc]init];
[request setSource:srcMapItem];
[request setDestination:distMapItem];
[request setTransportType:MKDirectionsTransportTypeWalking];
MKDirections *direction = [[MKDirections alloc]initWithRequest:request];
[direction calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
NSLog(@"response = %@",response);
NSArray *arrRoutes = [response routes];
[arrRoutes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
MKRoute *rout = obj;
MKPolyline *line = [rout polyline];
[map addOverlay:line];
NSLog(@"Rout Name : %@",rout.name);
NSLog(@"Total Distance (in Meters) :%f",rout.distance);
NSArray *steps = [rout steps];
NSLog(@"Total Steps : %lu",(unsigned long)[steps count]);
[steps enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"Rout Instruction : %@",[obj instructions]);
NSLog(@"Rout Distance : %f",[obj distance]);
}];
}];
}];
}
如何绘制折线。
答案 0 :(得分：1)
您必须在iOS 8中使用MKPolylineRenderer
以下是通过点按位置添加MKPolyline的代码，您可以获得帮助。
<强> Pin.h
#import <Foundation/Foundation.h>
@import MapKit;
@interface Pin : NSObject <MKAnnotation>
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
- (id)initWithCoordinate:(CLLocationCoordinate2D)newCoordinate;
@end
<强> Pin.m
#import "Pin.h"
@implementation Pin
- (id)initWithCoordinate:(CLLocationCoordinate2D)newCoordinate {
self = [super init];
if (self) {
_coordinate = newCoordinate;
_title = @"Hello";
_subtitle = @"Are you still there?";
}
return self;
}
@end
<强> ViewController.h
#import <UIKit/UIKit.h>
@import MapKit;
@interface ViewController : UIViewController <MKMapViewDelegate>
@end
<强> ViewController.m
#import "ViewController.h"
#import "Pin.h"
@interface ViewController ()
@property (strong, nonatomic) IBOutlet MKMapView *mapView;
@property (nonatomic, strong) NSMutableArray *allPins;
@property (nonatomic, strong) MKPolylineRenderer *lineView;
@property (nonatomic, strong) MKPolyline *polyline;
- (IBAction)drawLines:(id)sender;
- (IBAction)undoLastPin:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.allPins = [[NSMutableArray alloc]init];
// add a long press gesture
UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(addPin:)];
recognizer.minimumPressDuration = 0.5;
[self.mapView addGestureRecognizer:recognizer];
}
// let the user add their own pins
- (void)addPin:(UIGestureRecognizer *)recognizer {
if (recognizer.state != UIGestureRecognizerStateBegan) {
return;
}
// convert touched position to map coordinate
CGPoint userTouch = [recognizer locationInView:self.mapView];
CLLocationCoordinate2D mapPoint = [self.mapView convertPoint:userTouch toCoordinateFromView:self.mapView];
// and add it to our view and our array
Pin *newPin = [[Pin alloc]initWithCoordinate:mapPoint];
[self.mapView addAnnotation:newPin];
[self.allPins addObject:newPin];
[self drawLines:self];
}
- (IBAction)drawLines:(id)sender {
// HACK: for some reason this only updates the map view every other time
// and because life is too frigging short, let's just call it TWICE
[self drawLineSubroutine];
[self drawLineSubroutine];
}
- (IBAction)undoLastPin:(id)sender {
// grab the last Pin and remove it from our map view
Pin *latestPin = [self.allPins lastObject];
[self.mapView removeAnnotation:latestPin];
[self.allPins removeLastObject];
// redraw the polyline
[self drawLines:self];
}
- (void)drawLineSubroutine {
// remove polyline if one exists
[self.mapView removeOverlay:self.polyline];
// create an array of coordinates from allPins
CLLocationCoordinate2D coordinates[self.allPins.count];
int i = 0;
for (Pin *currentPin in self.allPins) {
coordinates[i] = currentPin.coordinate;
i++;
}
// create a polyline with all cooridnates
MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coordinates count:self.allPins.count];
[self.mapView addOverlay:polyline];
self.polyline = polyline;
// create an MKPolylineView and add it to the map view
self.lineView = [[MKPolylineRenderer alloc]initWithPolyline:self.polyline];
self.lineView.strokeColor = [UIColor redColor];
self.lineView.lineWidth = 5;
// for a laugh: how many polylines are we drawing here?
self.title = [[NSString alloc]initWithFormat:@"%lu", (unsigned long)self.mapView.overlays.count];
}
- (MKPolylineRenderer *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay {
return self.lineView;
}
@end
获取距离
CLLocationDistance dist = [from distanceFromLocation:current];