NSManagedObject获取器/设置器无法识别的选择器错误

Question

我收到以下错误。我不明白为什么，因为latitude和longitude在执行文件中有@dynamic，并且它们不是保留字（据我所知）。我在使用核心数据RestKit。

if ([ObservationSite count:nil] == 0) 
{ 
    for (int i = 1; i <= 5; i++) 
    { 
     NSLog(@"Creating observation site #%i", i); 
     ObservationSite *site = [ObservationSite object]; 
     site.observationSiteID = [NSNumber numberWithInt:i]; 
     site.name = [NSString stringWithFormat:@"James's Place #%i", i, nil]; 
     site.address = @"Somewhere"; 
     site.latitude = [NSNumber numberWithDouble:30.3605+i]; 
     site.longitude = [NSNumber numberWithDouble:-96.1852+i]; 
     [[[RKObjectManager sharedManager] objectStore] save]; 
    } 
} 

NSFetchRequest *fetchRequest = [ObservationSite fetchRequest]; 
NSArray *sites = [[ObservationSite objectsWithFetchRequest:fetchRequest] retain]; 
for (ObservationSite *site in sites) 
{ 
    NSLog(@"Name: %@", site.name); 
    NSLog(@"Address: %@", site.address); 
    NSLog(@"Latitude: %@", site.latitude); 
    NSLog(@"Longitude: %@", site.longitude); 
} 

ObservationSite头文件：

#import <Foundation/Foundation.h> 
#import <CoreData/CoreData.h> 
#import <MapKit/MapKit.h> 


@interface ObservationSite : NSManagedObject <MKAnnotation> 
{ 
    CLLocationCoordinate2D _coordinate; 
    NSString *_title; 
    NSString *_subtitle; 
} 

@property (nonatomic, retain) NSNumber *observationSiteID; 
@property (nonatomic, retain) NSNumber *latitude; 
@property (nonatomic, retain) NSNumber *longitude; 
@property (nonatomic, retain) NSString *address; 
@property (nonatomic, retain) NSString *name; 

+ (ObservationSite *)mapAnnotation; 
+ (ObservationSite *)mapAnnotationWithCoordinate:(CLLocationCoordinate2D)coordinate; 
+ (ObservationSite *)mapAnnotationWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title; 
+ (ObservationSite *)mapAnnotationWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title subtitle:(NSString *)subtitle; 

@end 

ObservationSite实现文件：导致错误

2011-11-06 18:12:23.428 Dark Sky Finder[19407:11903] Creating observation site #1 
2011-11-06 18:12:23.431 Dark Sky Finder[19407:11903] -[ObservationSite setLatitude:]: unrecognized selector sent to instance 0x735fdf0 
2011-11-06 18:12:23.431 Dark Sky Finder[19407:11903] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ObservationSite setLatitude:]: unrecognized selector sent to instance 0x735fdf0' 

代码

#import "ObservationSite.h" 

@implementation ObservationSite 

@synthesize coordinate = _coordinate; 
@synthesize title = _title; 
@synthesize subtitle = _subtitle; 

@dynamic observationSiteID; 
@dynamic latitude; 
@dynamic longitude; 
@dynamic address; 
@dynamic name; 

+ (ObservationSite *)mapAnnotation { 
    return [[[self alloc] init] autorelease]; 
} 

+ (ObservationSite *)mapAnnotationWithCoordinate:(CLLocationCoordinate2D)coordinate { 
    return [self mapAnnotationWithCoordinate:coordinate title:nil subtitle:nil]; 
} 

+ (ObservationSite *)mapAnnotationWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title { 
    return [self mapAnnotationWithCoordinate:coordinate title:title subtitle:nil]; 
} 

+ (ObservationSite *)mapAnnotationWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title subtitle:(NSString *)subtitle { 
    ObservationSite *annotation = [[[self alloc] init] autorelease]; 
    annotation.coordinate = coordinate; 
    annotation.title = title; 
    annotation.subtitle = subtitle; 
    return annotation; 
} 

@end 

Answer 1

哎呦 - 属性名我在ObservationSite头文件/实现文件中使用的数据模型与之不同。我现在将它们重命名为相同的，并且工作正常。