Kodowanie obiektu CLLocationcoordinate2D

Question

Próbuję kodować adnotacje znajdujące się na mapie, ale czytałem, że nie mogę kodować zmiennych CLLocationcoordinate2D. Czy ktoś wie, jak mogę to rozwiązać? Oto kod.

To tam wpadnę szpilki:

- (void)press:(UILongPressGestureRecognizer *)recognizer { 
    CGPoint touchPoint = [recognizer locationInView:_worldView]; 
    CLLocationCoordinate2D touchMapCoordinate = [_worldView convertPoint:touchPoint toCoordinateFromView:_worldView]; 

    geocoder = [[CLGeocoder alloc]init]; 
    CLLocation *location = [[CLLocation alloc]initWithCoordinate:touchMapCoordinate 
                altitude:CLLocationDistanceMax 
              horizontalAccuracy:kCLLocationAccuracyBest 
              verticalAccuracy:kCLLocationAccuracyBest 
                timestamp:[NSDate date]]; 
    [geocoder reverseGeocodeLocation:location 
       completionHandler:^(NSArray *placemarks, NSError *error) { 
        //NSLog(@"reverseGeocoder:completionHandler: called"); 
        if (error) { 
         //NSLog(@"Geocoder failed with error: %@", error); 
        } else { 
         CLPlacemark *place = [placemarks objectAtIndex:0]; 
         geocodedAddress = [NSString stringWithFormat:@"%@ %@, %@ %@", [place subThoroughfare], [place thoroughfare], [place locality], [place administrativeArea]]; 
         if (UIGestureRecognizerStateBegan == [recognizer state]) { 
          value = [number intValue]; 
          number = [NSNumber numberWithInt:value + 1]; 
          _addressPin = [[MapPoint alloc]initWithAddress:geocodedAddress coordinate:touchMapCoordinate 
                    title:geocodedAddress identifier:number]; 
          NSLog(@"The identifier is %@", number); 
          [[Data singleton].annotations addObject:_addressPin]; 
          [_worldView addAnnotation:_addressPin]; 
          NSLog(@"The number of pins in the annotation array is: %u",[Data singleton].annotations.count); 
         } 
        } 
       }]; 
} 

Oto moja klasa, która jest zgodna z protcol MKAnnotation:

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

@interface MapPoint : NSObject <MKAnnotation, NSCoding> 
{ 
} 

- (id)initWithAddress:(NSString*)address 
    coordinate:(CLLocationCoordinate2D)coordinate 
     title:(NSString *)t 
     identifier:(NSNumber *)ident; 


//This is a required property from MKAnnotation 
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate; 

//This is an optional property from MKAnnotataion 
@property (nonatomic, copy) NSString *title; 
@property (nonatomic, readonly, copy) NSString *subtitle; 
@property (nonatomic) BOOL animatesDrop; 
@property (nonatomic) BOOL canShowCallout; 

@property (copy) NSString *address; 
@property (copy) NSNumber *identifier; 
@property (nonatomic, copy) NSString *imageKey; 
@property (nonatomic, copy) UIImage *image; 

@end 

import "MapPoint.h" 

@implementation MapPoint 

@synthesize title, subtitle, animatesDrop, canShowCallout, imageKey, image; 
@synthesize address = _address, coordinate = _coordinate, identifier = _indentifier; 

-(id)initWithAddress:(NSString *)address 
     coordinate:(CLLocationCoordinate2D)coordinate 
      title:(NSString *)t 
     identifier:(NSNumber *)ident { 
    self = [super init]; 

    if (self) { 
     _address = [address copy]; 
     _coordinate = coordinate; 
     _indentifier = ident; 

     [self setTitle:t]; 

     NSDate *theDate = [NSDate date]; 

     subtitle = [NSDateFormatter localizedStringFromDate:theDate 
               dateStyle:NSDateFormatterShortStyle 
               timeStyle:NSDateFormatterShortStyle]; 
     } 
    return self; 
} 

- (void)encodeWithCoder:(NSCoder *)aCoder { 

    [aCoder encodeObject:_address forKey:@"address"]; 


    [aCoder encodeObject:title forKey:@"title"]; 
    [aCoder encodeObject:_indentifier forKey:@"identifier"]; 
} 

- (id)initWithCoder:(NSCoder *)aDecoder { 
    self = [super init]; 
    if (self) { 
     [self setAddress:[aDecoder decodeObjectForKey:@"address"]]; 

    } 
    return self; 
} 

@end

Answer 1

Wystarczy zakodować dwa polach CLLocationCoordinate2D wartość.

[aCoder encodeDouble:_coordinate.latitude forKey:@"latitude"]; 
[aCoder encodeDouble:_coordinate.longitude forKey:@"longitude"]; 

Answer 2

NSValue jest zgodny z NSCoding. Można box zmienną CLLocationcoordinate2D w obiekcie NSValue:

[coder encodeObject:[NSValue valueWithMKCoordinate:coordinate] forKey:@"coordinate"] 

Answer 3

długość i szerokość geograficzna CLLocationCoordinate2D „s są typu CLLocationDegrees która jest w istocie, fantazyjny sposób na powiedzenie double.

ten sposób można zakodować i ich dekodowania:

NSString *const kPinCoordinateLatitudeKey = @"kPinCoordinateLatitudeKey"; 
NSString *const kPinCoordinateLongitudeKey = @"kPinCoordinateLongitudeKey"; 

- (void)encodeWithCoder:(NSCoder *)encoder 
{ 
    [encoder encodeDouble:self.coordinate.latitude forKey:kPinCoordinateLatitudeKey]; 
    [encoder encodeDouble:self.coordinate.longitude forKey:kPinCoordinateLongitudeKey]; 
} 

- (id)initWithCoder:(NSCoder *)decoder 
{ 
    if((self = [super init])) { 
     CLLocationDegrees latitude = [decoder decodeDoubleForKey:kPinCoordinateLatitudeKey]; 
     CLLocationDegrees longitude = [decoder decodeDoubleForKey:kPinCoordinateLongitudeKey]; 
     _coordinate = CLLocationCoordinate2DMake(latitude, longitude); 
    } 
    return self; 
} 

Answer 4

postanowiłem zakodować użyć dojścia CLLocation właściwość ta sytuacja, która jest zgodna z NSSecureCoding.

Jeśli trzeba konwertować do lub z CLLocationCoordinate2D:

// Coordinate to Location 
CLLocationCoordinate2D coord; 
CLLocation *loc = [[CLLocation alloc] initWithLatitude:coord.latitude 
              longitude:coord.longitude]; 

// Location to Coordinate 
CLLocationCoordinate2D coord = loc.coordinate;