NSManagedObject getter/setter 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 在实现文件中有 @dynamic，并且它们不是保留字（到目前为止据我所知）。我将 RestKit 与 Core Data 一起使用。

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'

导致错误的代码：

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：

#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

糟糕 - 我在 ObservationSite 标头/实现文件中使用的属性名称与数据模型中的不同。我现在将它们重命名为相同的，并且工作正常。