在多個位置繪製地圖路徑

Question

我是iphone開發新手，我想繪製5位置之間的路徑，我可以如何在谷歌地圖中繪製路徑。 我希望路徑從位置1到位置2，位置2到位置3，位置3到位置4和位置4到位置5。

這裏是我的代碼

- (void)viewDidLoad { 
[super viewDidLoad]; 

NSDictionary *d1,*d2,*d3,*d4,*d5; 

d1=[NSDictionary dictionaryWithObjectsAndKeys:@"location1",@"comments",@"1",@"id",@"23.02941395",@"latitude",@"72.54620655",@"longitude",nil]; 
d2=[NSDictionary dictionaryWithObjectsAndKeys:@"location2",@"comments",@"2",@"id",@"23.028359049999995",@"latitude",@"72.54537318333334",@"longitude",nil]; 
d3=[NSDictionary dictionaryWithObjectsAndKeys:@"location3",@"comments",@"3",@"id",@"23.029545",@"latitude",@"72.546036",@"longitude",nil]; 
d4=[NSDictionary dictionaryWithObjectsAndKeys:@"location4",@"comments",@"4",@"id",@"23.030050",@"latitude",@"72.546226",@"longitude",nil]; 
d5=[NSDictionary dictionaryWithObjectsAndKeys:@"location5",@"comments",@"5",@"id",@"23.030050",@"latitude",@"72.546022",@"longitude",nil]; 


self.reports=[NSArray arrayWithObjects:d1,d2,d3,d4,d5,nil]; 


for (NSDictionary *d in self.reports) { 
    float latitude=[[d valueForKey:@"latitude"] floatValue]; 
    float longitude=[[d valueForKey:@"longitude"] floatValue]; 

    Place* home = [[[Place alloc] init] autorelease]; 
    home.name = [d valueForKey:@"comments"]; 
    home.latitude = latitude; 
    home.longitude = longitude; 

    PlaceMark *from = [[[PlaceMark alloc] initWithPlace:home] autorelease];    
    [mapView addAnnotation:from]; 

} 


[self centerMap]; 

    } 

    -(void) centerMap 

    { 
MKCoordinateRegion region; 
CLLocationDegrees maxLat = -90; 
CLLocationDegrees maxLon = -180; 
CLLocationDegrees minLat = 120; 
CLLocationDegrees minLon = 150; 
NSMutableArray *temp=[NSArray arrayWithArray:self.reports]; 
NSLog(@"%@",temp); 
for (int i=0; i<[temp count];i++) { 
    Place* home = [[[Place alloc] init] autorelease]; 
    home.latitude = [[[temp objectAtIndex:i] valueForKey:@"latitude"]floatValue]; 
    home.longitude =[[[temp objectAtIndex:i] valueForKey:@"longitude"]floatValue]; 

    PlaceMark* from = [[[PlaceMark alloc] initWithPlace:home] autorelease];  

    CLLocation* currentLocation = (CLLocation*)from ; 
    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]; 

    } 
    - (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation 
    { 

if (annotation == mapView.userLocation) 
    return nil; 

MKPinAnnotationView *pin = (MKPinAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier: @"asdf"]; 

if (pin == nil) 
    pin = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier: @"asdf"] autorelease]; 
else 
    pin.annotation = annotation; 
pin.userInteractionEnabled = YES; 
UIButton *disclosureButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
[disclosureButton setFrame:CGRectMake(0, 0, 30, 30)]; 

pin.rightCalloutAccessoryView = disclosureButton; 
pin.pinColor = MKPinAnnotationColorRed; 
//pin.animatesDrop = YES; 
[pin setEnabled:YES]; 
[pin setCanShowCallout:YES]; 
return pin; 

    } 

    - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control 
    { 
NSString *strTitle = [NSString stringWithFormat:@"%@",[view.annotation title]]; 
NSMutableDictionary *d; 
NSMutableArray *temp=[NSArray arrayWithArray:self.reports]; 


for (int i = 0; i<[temp count]; i++) 
{ 
    d = (NSMutableDictionary*)[temp objectAtIndex:i]; 
    NSString *strAddress = [NSString stringWithFormat:@"%@",[d valueForKey:@"comments"]]; 

    if([strAddress isEqualToString:strTitle]) { 
     [self presentModalViewController:self.nxtDetailsVCtr animated:YES]; 
     [self.nxtDetailsVCtr.lblDetail setText:strAddress];  
     break; 
    } 


} 
    } 

Answer 1

  #import "ViewController.h" 
      #import "JSONKit.h" 

     @interface ViewController() 

    @end 

    @implementation ViewController 

    NSMutableArray *locationarry ; 
    NSMutableDictionary * citywiselatlong ; 


    - (void)viewDidLoad 
    { 

     locationarry = [[NSMutableArray alloc]initWithObjects:@"Ahmedabad",@"Rajkot",@"Baroda",@"Surat", nil]; 

citywiselatlong = [[NSMutableDictionary alloc]init]; 



[self locationfind]; 

NSMutableString* TotalXMLString = [[NSMutableString alloc]init]; 

[TotalXMLString appendFormat:@"http://maps.googleapis.com/maps/api/distancematrix/json?origins="]; 

[TotalXMLString appendFormat:@"%@,%@&destinations=",[[citywiselatlong valueForKey:[locationarry objectAtIndex:0]] valueForKey:@"lat"] ,[[citywiselatlong valueForKey:[locationarry objectAtIndex:0]] valueForKey:@"lng"]]; 


for (int i = 1; i < [locationarry count]; i++) { 

    [TotalXMLString appendFormat:@"%@,%@",[[citywiselatlong valueForKey:[locationarry objectAtIndex:i]] valueForKey:@"lat"] ,[[citywiselatlong valueForKey:[locationarry objectAtIndex:i]] valueForKey:@"lng"]]; 

    if (i != [locationarry count] -1) { 
     [TotalXMLString appendFormat:@"|"]; 
    } 
    else 
    { 
     [TotalXMLString appendFormat:@"&mode=driving&sensor=false"]; 
    } 

} 


NSURL* apiUrl = [NSURL URLWithString:[TotalXMLString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]]; 

NSError* error = nil; 
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error]; 

NSDictionary *dic=[apiResponse objectFromJSONString]; 
NSLog(@"%@",dic); 


NSMutableArray * distance = [[NSMutableArray alloc]initWithArray:[[[[dic valueForKey:@"rows"] objectAtIndex:0] valueForKey:@"elements"]valueForKey:@"distance"]]; 



for (int j= 0 ; j < [distance count]; j++) { 

    NSMutableDictionary *data = [[NSMutableDictionary alloc]initWithDictionary:[distance objectAtIndex:j]]; 


} 

NSLog(@"%@",distance); 

[__mapView setShowsUserLocation:YES]; 
[__mapView setZoomEnabled:YES]; 
[__mapView setScrollEnabled:YES]; 
[__mapView setMapType:MKMapTypeHybrid]; 
[__mapView setDelegate:self]; 



routes=[[NSArray alloc] init]; 
[super viewDidLoad]; 
// Do any additional setup after loading the view, typically from a nib. 


} 

- (void)didReceiveMemoryWarning 
{ 
[super didReceiveMemoryWarning]; 
// Dispose of any resources that can be recreated. 
} 


    #pragma mark- MKMapView delegate method 

    - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay 
{ 
MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay]; 
polylineView.strokeColor = [UIColor purpleColor]; 
polylineView.lineWidth = 5.0; 

NSLog(@"polyline in viewFor overlay: %@",polylineView); 
return polylineView; 
    } 

    - (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation 
    { 
NSLog(@"did update user location called "); 
MKCoordinateRegion region; 

region.span.latitudeDelta = .005; 
region.span.longitudeDelta = .005; 
region.center = userLocation.coordinate; 

[mapView setRegion:region animated:YES]; 
    } 


    - (NSMutableArray *)decodePolyLine: (NSMutableString *)encoded 
    { 
[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]; 
    //printf("[%f,", [latitude doubleValue]); 
    //printf("%f]", [longitude doubleValue]); 
    CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]]; 
    [array addObject:loc]; 
} 
return array; 
    } 

    -(NSArray*) calculateRoutesFrom:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t 
    { 
NSString* saddr = [NSString stringWithFormat:@"%f,%f", f.latitude, f.longitude]; 
NSString* daddr = [NSString stringWithFormat:@"%f,%f", t.latitude, t.longitude]; 

NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false&avoid=highways&mode=",saddr,daddr]; 

NSLog(@"Fired API %@",apiUrlStr); 

NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; 

NSError* error = nil; 
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error]; 

NSDictionary *dic=[apiResponse objectFromJSONString]; 

if (dic!=nil) { 
    NSArray *routPoints=[[NSArray alloc] initWithArray:[dic valueForKey:@"routes"]]; 

    NSDictionary *polylineOverview=[[routPoints objectAtIndex:0] valueForKey:@"overview_polyline"]; 
    NSString *polylinePoints = [polylineOverview objectForKey:@"points"]; 
    return [self decodePolyLine:[polylinePoints mutableCopy]]; 
} 

return nil; 
    } 


    - (IBAction)drawPath:(id)sender { 

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){ 
    //Background Thread 
    [self showRouteFrom:startLocation to:endLocation]; 
    dispatch_async(dispatch_get_main_queue(), ^(void){ 
     //Run UI Updates 

     if (polyLine) { 
      [__mapView setVisibleMapRect:[polyLine boundingMapRect]]; 
      [__mapView addOverlay:polyLine]; 
     } 

     NSLog(@"drawing path completed"); 
    }); 
}); 
    } 

    -(void) showRouteFrom: (id<MKAnnotation>)source to:(id<MKAnnotation>)destination; 
    { 
    routes = [self calculateRoutesFrom:source.coordinate to:destination.coordinate]; 
NSLog(@"routes are %@",routes); 

NSInteger numberOfSteps = routes.count; 

CLLocationCoordinate2D coordinates[numberOfSteps]; 
for (NSInteger index = 0; index < numberOfSteps; index++) 
{ 
    CLLocation *location = [routes objectAtIndex:index]; 
    CLLocationCoordinate2D coordinate = location.coordinate; 
    coordinates[index] = coordinate; 
} 

polyLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps]; 


[polyLineArray addObject:polyLine]; 

    } 

    - (IBAction)drawMultiple:(id)sender 
    { 
polyLineArray=[[NSMutableArray alloc] init]; 


MKPointAnnotation *start=[[MKPointAnnotation alloc] init]; 
MKPointAnnotation *end=[[MKPointAnnotation alloc] init]; 

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){ 
    //Background Thread 

    for (int i=0;i<locationarry.count-1;i++) 
    { 
     NSArray *part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:i] componentsSeparatedByString:@","]]; 

     NSDictionary *dic=[citywiselatlong objectForKey:[part objectAtIndex:0]]; 

     [start setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"lat"] floatValue], [[dic valueForKey:@"lng"] floatValue])]; 

     part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:i +1 ] componentsSeparatedByString:@","]]; 
     dic=[citywiselatlong objectForKey:[part objectAtIndex:0]]; 

     [end setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"lat"] floatValue], [[dic valueForKey:@"lng"] floatValue])]; 

     [self showRouteFrom:start to:end]; 

    } 
    dispatch_async(dispatch_get_main_queue(), ^(void){ 
     //Run UI Updates 


     NSArray *part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:0] componentsSeparatedByString:@","]]; 

     NSDictionary *tempDic=[[NSDictionary alloc] initWithDictionary:[citywiselatlong objectForKey:[part objectAtIndex:0]]]; 

     [start setCoordinate:CLLocationCoordinate2DMake([[tempDic valueForKey:@"lat"] floatValue], [[tempDic valueForKey:@"lng"] floatValue])]; 

     if (polyLine) { 
      [__mapView setVisibleMapRect:[polyLine boundingMapRect]]; 
      for (MKPolyline *pLine in polyLineArray) { 
       [__mapView addOverlay:pLine]; 
      } 
     } 


     for (int i =0 ; i< [locationarry count]; i ++) 
     { 
      NSArray *part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:i] componentsSeparatedByString:@","]]; 

      NSDictionary *dic=[citywiselatlong objectForKey:[part objectAtIndex:0]]; 

      MKPointAnnotation *first=[[MKPointAnnotation alloc] init]; 
      MKPointAnnotation *second=[[MKPointAnnotation alloc] init]; 

      [first setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"lat"] floatValue], [[dic valueForKey:@"lng"] floatValue])]; 

      if(i+1<[locationarry count]) 
      { 
       NSArray *part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:i + 1] componentsSeparatedByString:@","]]; 

       dic=[citywiselatlong objectForKey:[part objectAtIndex:0]]; 

       [second setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"lat"] floatValue], [[dic valueForKey:@"lng"] floatValue])]; 
      } 
      else 
      { 
       NSArray *part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:i] componentsSeparatedByString:@","]]; 
       dic=[citywiselatlong objectForKey:[part objectAtIndex:0]];; 

       [second setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"lat"] floatValue], [[dic valueForKey:@"lng"] floatValue])]; 

      } 

      if (i==0) 
      { 
       [__mapView addAnnotation:first]; 
       [__mapView addAnnotation:second]; 
      } 
      else 
      { 
       [__mapView addAnnotation:second]; 

      } 
     } 


     NSLog(@"drawing path completed"); 
    }); 
    }); 
     } 

    -(void) centerMap 
    { 
MKCoordinateRegion region; 
CLLocationDegrees maxLat = -90.0; 
CLLocationDegrees maxLon = -180.0; 
CLLocationDegrees minLat = 90.0; 
CLLocationDegrees minLon = 180.0; 

for(int idx = 0; idx < routes.count; idx++) 
{ 
    CLLocation* currentLocation = [routes 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)/2.0; 
region.center.longitude = (maxLon + minLon)/2.0; 
region.span.latitudeDelta = 0.01; 
region.span.longitudeDelta = 0.01; 

region.span.latitudeDelta = ((maxLat - minLat)<0.0)?100.0:(maxLat - minLat); 
region.span.longitudeDelta = ((maxLon - minLon)<0.0)?100.0:(maxLon - minLon); 
[__mapView setRegion:region animated:YES]; 
    } 


    #pragma mark- UITextField delegate method 


    -(void)locationfind 
    { 

for (int i = 0; i < [locationarry count]; i++) { 

    NSDictionary *locationDic=[self getLatLongOfPlace:[[locationarry objectAtIndex:i] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]]; 
    NSDictionary *latLongDic=[[[[locationDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"geometry"]valueForKey:@"location"]; 

    NSArray *part = [[NSArray alloc]initWithArray:[[locationarry objectAtIndex:i] componentsSeparatedByString:@","]]; 

    [citywiselatlong setObject:latLongDic forKey:[part objectAtIndex:0]]; 
    NSLog(@"%@",citywiselatlong); 

} 

    } 

    #pragma mark Getting lat long from place name. 

    -(NSDictionary*)getLatLongOfPlace:(NSString*)place 
    { 
NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?address=%@&sensor=true",place]; 

NSLog(@"Fired URL:- %@",apiUrlStr); 

NSURL* apiUrl = [NSURL URLWithString:[apiUrlStr stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]]; 

NSError* error = nil; 
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error]; 

NSDictionary *dic=[apiResponse objectFromJSONString]; 
return dic; 
    } 

@end 

Answer 2

您可以使用NVPlolineAnnotation繪製地圖內線。這是Source Code。

Answer 3

框架所需

QuartzCore.framework
CoreLocation.framework
MapKit.framework

所需文件

JSONKit.h
JSONKit.m

設置-fno-objc -ARC在ARC的情況下爲JSON編譯源代碼。

在頭文件

__block IBOutlet MKMapView *__mapView; 
NSArray* routes; 

MKPointAnnotation *startLocation; 
MKPointAnnotation *endLocation; 

MKPolyline *polyLine; 

執行一段代碼...

- (void)viewDidLoad 
{ 
// [__mapView setShowsUserLocation:YES]; 
    [__mapView setZoomEnabled:YES]; 
    [__mapView setScrollEnabled:YES]; 
    [__mapView setMapType:MKMapTypeStandard]; 
    [__mapView setDelegate:self]; 

    routes=[[NSArray alloc] init]; 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
} 

- (IBAction)drawPath:(id)sender { 

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){ 
     //Background Thread 
     [self showRouteFrom:startLocation to:endLocation]; 
     dispatch_async(dispatch_get_main_queue(), ^(void){ 
      //Run UI Updates 

      if (polyLine) { 
       [__mapView setVisibleMapRect:[polyLine boundingMapRect]]; 
       [__mapView addOverlay:polyLine]; 

       [self centerMap]; 
      } 

      NSLog(@"drawing path completed"); 
     }); 
    }); 
} 


-(void) showRouteFrom: (id<MKAnnotation>)source to:(id<MKAnnotation>)destination; 
{ 
    if(routes) 
    { 
     [__mapView removeAnnotations:[__mapView annotations]]; 
    } 

    [__mapView addAnnotation:source]; 
    [__mapView addAnnotation:destination]; 

    NSLog(@"source title is %@",source.title); 
    NSLog(@"destination title is %@",destination.title); 

    routes = [self calculateRoutesFrom:source.coordinate to:destination.coordinate]; 
    NSLog(@"routes are %@",routes); 

    NSInteger numberOfSteps = routes.count; 

    CLLocationCoordinate2D coordinates[numberOfSteps]; 
    for (NSInteger index = 0; index < numberOfSteps; index++) 
    { 
     CLLocation *location = [routes objectAtIndex:index]; 
     CLLocationCoordinate2D coordinate = location.coordinate; 
     coordinates[index] = coordinate; 
    } 

    polyLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps]; 

    NSLog(@"poly line to be added as ovelay is %@",polyLine); 
} 

-(NSArray*) calculateRoutesFrom:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t 
{ 
    NSString* saddr = [NSString stringWithFormat:@"%f,%f", f.latitude, f.longitude]; 
    NSString* daddr = [NSString stringWithFormat:@"%f,%f", t.latitude, t.longitude]; 

    NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false&avoid=highways&mode=",saddr,daddr]; 

    NSLog(@"Fired API %@",apiUrlStr); 

    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; 

    NSError* error = nil; 
    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error]; 

    NSDictionary *dic=[apiResponse objectFromJSONString]; 

    if (dic!=nil) { 
     NSArray *routPoints=[[NSArray alloc] initWithArray:[dic valueForKey:@"routes"]]; 

     NSDictionary *polylineOverview=[[routPoints objectAtIndex:0] valueForKey:@"overview_polyline"]; 
     NSString *polylinePoints = [polylineOverview objectForKey:@"points"]; 
     return [self decodePolyLine:[polylinePoints mutableCopy]]; 
    } 

    return nil; 
} 


- (NSMutableArray *)decodePolyLine: (NSMutableString *)encoded 
{ 
    [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]; 
     //printf("[%f,", [latitude doubleValue]); 
     //printf("%f]", [longitude doubleValue]); 
     CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]]; 
     [array addObject:loc]; 
    } 
    return array; 
} 

#pragma mark- MKMapView delegate method 

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay 
{ 
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay]; 
    polylineView.strokeColor = [UIColor purpleColor]; 
    polylineView.lineWidth = 5.0; 

    NSLog(@"polyline in viewFor overlay: %@",polylineView); 
    return polylineView; 
} 

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation 
{ 
    NSLog(@"did update user location called "); 
    MKCoordinateRegion region; 

    region.span.latitudeDelta = .005; 
    region.span.longitudeDelta = .005; 
    region.center = userLocation.coordinate; 

    [mapView setRegion:region animated:YES]; 
} 

-(void) centerMap 
{ 
    MKCoordinateRegion region; 
    CLLocationDegrees maxLat = -90.0; 
    CLLocationDegrees maxLon = -180.0; 
    CLLocationDegrees minLat = 90.0; 
    CLLocationDegrees minLon = 180.0; 

    for(int idx = 0; idx < routes.count; idx++) 
    { 
     CLLocation* currentLocation = [routes 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)/2.0; 
    region.center.longitude = (maxLon + minLon)/2.0; 
    region.span.latitudeDelta = 0.01; 
    region.span.longitudeDelta = 0.01; 

    region.span.latitudeDelta = ((maxLat - minLat)<0.0)?100.0:(maxLat - minLat); 
    region.span.longitudeDelta = ((maxLon - minLon)<0.0)?100.0:(maxLon - minLon); 
    [__mapView setRegion:region animated:YES]; 
} 

#pragma mark- UITextField delegate method 

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField 
{ 
    [self.view bringSubviewToFront:textField]; 

    CGRect rect=textField.frame; 

    [[NSUserDefaults standardUserDefaults] setValue:NSStringFromCGRect(rect) forKey:@"textFieldRect"]; 

    rect.origin.y=self.view.frame.size.height-260; 

    [UIView animateWithDuration:0.3 animations:^{ 
     [textField setFrame:rect]; 
    }]; 

    return YES; 
} 


- (BOOL)textFieldShouldReturn:(UITextField *)textField 
{ 
    NSString *rectStr=[[NSUserDefaults standardUserDefaults] valueForKey:@"textFieldRect"]; 
    NSArray *rectArray=[rectStr componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"{,} "]]; 

    CGRect rect; 

    rect.origin.x=[[rectArray objectAtIndex:2] floatValue]; 
    rect.origin.y=[[rectArray objectAtIndex:4] floatValue]; 
    rect.size.width=[[rectArray objectAtIndex:8] floatValue]; 
    rect.size.height=[[rectArray objectAtIndex:10] floatValue]; 

    [UIView animateWithDuration:0.3 animations:^{ 
     [textField setFrame:rect]; 
    }]; 
    [textField resignFirstResponder]; 
    return YES; 
} 


- (void)textFieldDidEndEditing:(UITextField *)textField 
{ 
    NSDictionary *locationDic=[self getLatLongOfPlace:[textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]]; 
    NSDictionary *latLongDic=[[[[[locationDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"geometry"]valueForKey:@"viewport"] valueForKey:@"northeast"]; 

    if (textField.tag==0) { 
     startLocation=[[MKPointAnnotation alloc] init]; 
     [startLocation setCoordinate:CLLocationCoordinate2DMake([[latLongDic valueForKey:@"lat"] floatValue], [[latLongDic valueForKey:@"lng"] floatValue])]; 
     startLocation.title=[textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; 
    }else{ 
     endLocation=[[MKPointAnnotation alloc] init]; 
     [endLocation setCoordinate:CLLocationCoordinate2DMake([[latLongDic valueForKey:@"lat"] floatValue], [[latLongDic valueForKey:@"lng"] floatValue])]; 
     endLocation.title=[textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; 
    } 

    NSLog(@"object at index is viewport %@",[[[[[locationDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"geometry"]valueForKey:@"viewport"] valueForKey:@"northeast"]); 
} 

#pragma mark Getting lat long from place name. 

-(NSDictionary*)getLatLongOfPlace:(NSString*)place 
{ 
    NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?address=%@&sensor=true",place]; 

    NSLog(@"Fired URL:- %@",apiUrlStr); 

    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; 

    NSError* error = nil; 
    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error]; 

    NSDictionary *dic=[apiResponse objectFromJSONString]; 
    return dic; 
} 

這裏是SampleCode我做

注：---在情況下，如果沒有按樣品不適用於你在這條線上查看方法加載方法

// [__mapView setShowsUserLocation：YES];

截圖

Answer 4

繪製多個點，你可以使用它作爲

需要在頭文件中聲明可變數組

NSMutableArray *polyLineArray; 

實現文件需要微小的變化== =

-(void) showRouteFrom: (id<MKAnnotation>)source to:(id<MKAnnotation>)destination; 
{ 
    NSLog(@"source title is %@",source.title); 
    NSLog(@"destination title is %@",destination.title); 

    routes = [self calculateRoutesFrom:source.coordinate to:destination.coordinate]; 
    NSLog(@"routes are %@",routes); 

    NSInteger numberOfSteps = routes.count; 

    CLLocationCoordinate2D coordinates[numberOfSteps]; 
    for (NSInteger index = 0; index < numberOfSteps; index++) 
    { 
     CLLocation *location = [routes objectAtIndex:index]; 
     CLLocationCoordinate2D coordinate = location.coordinate; 
     coordinates[index] = coordinate; 
    } 

    polyLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps]; 
    [polyLineArray addObject:polyLine]; 

// NSLog(@"poly line to be added as ovelay is %@",polyLine); 
} 


- (IBAction)drawMultiple:(id)sender 
{  
    polyLineArray=[[NSMutableArray alloc] init]; 

    NSDictionary *kolkata,*delhi,*chennai,*mumbai,*pune; 

    kolkata=[NSDictionary dictionaryWithObjectsAndKeys:@"location1",@"comments",@"1",@"id",@"23.0083321",@"latitude",@"88.54276659999",@"longitude",nil]; 
    delhi=[NSDictionary dictionaryWithObjectsAndKeys:@"location2",@"comments",@"2",@"id",@"28.889816",@"latitude",@"77.3418147",@"longitude",nil]; 
    chennai=[NSDictionary dictionaryWithObjectsAndKeys:@"location3",@"comments",@"3",@"id",@"13.23339843",@"latitude",@"80.3322912",@"longitude",nil]; 
    mumbai=[NSDictionary dictionaryWithObjectsAndKeys:@"location4",@"comments",@"4",@"id",@"19.2716339",@"latitude",@"72.9864994",@"longitude",nil]; 
    pune=[NSDictionary dictionaryWithObjectsAndKeys:@"location5",@"comments",@"5",@"id",@"18.6346965",@"latitude",@"73.9894867",@"longitude",nil]; 

    NSArray *arrayOfLocations=[[NSArray alloc] initWithObjects:kolkata,delhi,chennai,mumbai,pune,nil]; 

    MKPointAnnotation *start=[[MKPointAnnotation alloc] init]; 
    MKPointAnnotation *end=[[MKPointAnnotation alloc] init]; 

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){ 
     //Background Thread 

     for (int i=0;i<arrayOfLocations.count-1;i++) 
     { 
      NSDictionary *dic=[arrayOfLocations objectAtIndex:i]; 

      [start setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"latitude"] floatValue], [[dic valueForKey:@"longitude"] floatValue])]; 

      dic=[arrayOfLocations objectAtIndex:i+1]; 

      [end setCoordinate:CLLocationCoordinate2DMake([[dic valueForKey:@"latitude"] floatValue], [[dic valueForKey:@"longitude"] floatValue])]; 

      [self showRouteFrom:start to:end]; 
     } 

     dispatch_async(dispatch_get_main_queue(), ^(void){ 
      //Run UI Updates 

      NSDictionary *tempDic=[[NSDictionary alloc] initWithDictionary:[arrayOfLocations objectAtIndex:0]]; 

      [start setCoordinate:CLLocationCoordinate2DMake([[tempDic valueForKey:@"latitude"] floatValue], [[tempDic valueForKey:@"longitude"] floatValue])]; 


      [__mapView addAnnotation:start]; 
      [__mapView addAnnotation:end]; 

      if (polyLine) { 
       [__mapView setVisibleMapRect:[polyLine boundingMapRect]]; 
       for (MKPolyline *pLine in polyLineArray) { 
        [__mapView addOverlay:pLine]; 
       } 
      } 

      NSLog(@"drawing path completed"); 
     }); 
    }); 
} 

If u need sample code here it is

輸出是--------這裏

Answer 5

使用麪包屑是示例代碼..它是非常有用的...ü可以自定義根據你的要求代碼

https://developer.apple.com/library/ios/samplecode/Breadcrumb/Introduction/Intro.html