如何在用户步行或沿着道路行驶时画路线

Question

嗨，我是Ios的初学者，在我的项目中，我试图在用户步行或沿着道路行驶时绘制路线，但路线没有正确绘图，请帮我一些（如果有任何机构有想法请修改我的代码和发布工作代码）

我的代码如下： -

ViewController.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController<MKMapViewDelegate,CLLocationManagerDelegate>

{

    IBOutlet MKMapView *myMap;
    CLLocationManager *locmanager;
}


@property (strong, nonatomic) IBOutlet MKMapView *myMap;

@property (nonatomic, strong) NSMutableArray *allPinsArr;
@property (nonatomic, strong) MKPolylineView *lineView;
@property (nonatomic, strong) MKPolyline *polyline;

- (IBAction)startButton:(id)sender;

@end

ViewController.m

#import "ViewController.h"
#import "Location.h"
#import "Pin.h"

@interface ViewController ()
{
    CLLocationCoordinate2D curentLocation;
    CLLocation *oldLocation1;
    CLLocation *newLocation1;
    NSUserDefaults *def;
    BOOL isfirstRun;
}

@end

@implementation ViewController
@synthesize myMap,allPinsArr,polyline,lineView;

- (void)viewDidLoad {
    [super viewDidLoad];

    myMap.delegate = self;
    locmanager = [[CLLocationManager alloc] init];
    [locmanager setDelegate:self];

    if ([locmanager respondsToSelector:@selector(requestAlwaysAuthorization)])
    {
        [locmanager requestAlwaysAuthorization];
    }

    [locmanager setDistanceFilter:10.0f];
    [locmanager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters];
    [myMap setShowsUserLocation:YES];
 }

- (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
 }

- (IBAction)startButton:(id)sender {

    [myMap removeOverlay:self.polyline];
    [lineView removeFromSuperview];
    [myMap removeAnnotations:myMap.annotations];
    allPinsArr = [[NSMutableArray alloc]init];
    [locmanager startUpdatingLocation];
 }

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
 {

    newLocation1 = newLocation;
    oldLocation1 = oldLocation;
    curentLocation = newLocation.coordinate;
    [self checkthelocationisPreviousornot:newLocation :oldLocation];

 }

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"didFailWithError: %@", error);
    UIAlertView *errorAlert = [[UIAlertView alloc]
                               initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
}

// check new location is previous or not
-(void)checkthelocationisPreviousornot:(CLLocation *)newLocation :(CLLocation *)oldLocation {

    //For Sqlite Reference
    NSInteger idVal = [def integerForKey:@"id"];

    if (idVal==0) {

        idVal=1;
    }

    [def setInteger:idVal forKey:@"id"];

    if ((newLocation.coordinate.latitude!=oldLocation.coordinate.latitude || newLocation.coordinate.longitude!=oldLocation.coordinate.longitude) || isfirstRun==YES) {

        double distance =[oldLocation distanceFromLocation:newLocation];

        NSString *distStr = [NSString stringWithFormat:@"%f",distance];

        //Adding data in sqlite
       // [self insertcoordinatestodatabase:curentLocation :idVal :@"" :@""];

        [self addingCoordinatesToarray:newLocation.coordinate :distStr];
    }
}

//add co-ordinates to array
-(void)addingCoordinatesToarray:(CLLocationCoordinate2D )coordinates :(NSString *)distance {

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coordinates, 1000, 1000);
    [myMap setRegion:region animated:YES];

    Pin *pin =[[Pin alloc] initWithCoordinate:coordinates title:@"Entry point" distance:distance myimage:nil videopath:nil];

    [myMap addAnnotation:pin];

    [allPinsArr addObject:pin];

    [self drawline];

}

-(void)drawline{

    [self drawLineSubroutine];
    [self drawLineSubroutine];
}

- (void)drawLineSubroutine {

    // remove polyline if one exists
    [myMap removeOverlay:self.polyline];

    // create an array of coordinates from allPins
    CLLocationCoordinate2D coordinates[allPinsArr.count];
    int i = 0;
    for (Pin *currentLoc in allPinsArr) {

        coordinates[i] = currentLoc.coordinate;
        i++;
    }
    // create a polyline with all cooridnates

    polyline = [MKPolyline polylineWithCoordinates:coordinates count:allPinsArr.count];
    [myMap addOverlay:polyline];
    self.polyline = polyline;

}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKOverlayView* overlayView = nil;

    if(overlay == self.polyline)
    {
        //if we have not yet created an overlay view for this overlay, create it now.
        if (self.lineView) {
            [self.lineView removeFromSuperview];
        }
        self.lineView = [[MKPolylineView alloc] initWithPolyline:self.polyline];
        self.lineView.fillColor = [UIColor redColor];
        self.lineView.strokeColor = [UIColor greenColor];
        self.lineView.lineWidth = 10;
        overlayView = self.lineView;
    }

    return overlayView;
}


@end

Location.h

#import <Foundation/Foundation.h>
@import MapKit;

@interface Location : NSObject<MKAnnotation>{

    CLLocationCoordinate2D coordinate;
    NSString *loctionName;
    NSString *distance;
    NSString *mediaPath;

}
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, retain) NSString *loctionName;
@property (nonatomic, retain) NSString *distance;
@property (nonatomic, retain) NSString *mediaPath;
@end

Location.m

#import "Location.h"

@implementation Location
@synthesize coordinate,loctionName,distance,mediaPath;

@end

Pin.h

#import <Foundation/Foundation.h>
@import MapKit;

@interface Pin : NSObject <MKAnnotation> 

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, assign) int wayPointID;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *distance;
@property (nonatomic, copy) UIImage *myimage;
@property (nonatomic, copy) NSString *videopath;

- (id)initWithCoordinate:(CLLocationCoordinate2D)newCoordinate title:(NSString *)title distance:(NSString *)distance myimage:(UIImage *)myimage videopath:(NSString *)videopath;

@end

Pin.m

#import "Pin.h"

@implementation Pin

- (id)initWithCoordinate:(CLLocationCoordinate2D)newCoordinate title:(NSString *)title distance:(NSString *)distance myimage:(UIImage *)myimage videopath:(NSString *)videopath{

    self = [super init];
    if (self) {
        _coordinate = newCoordinate;
        _title = title;
        _distance = distance;
        _myimage = myimage;
        _videopath = videopath;
    }
    return self;
}

@end