相关疑难解决方法(0)

我不明白为什么我会收到这个错误.这是相关的代码:

Photo.h

#import <CoreData/CoreData.h>

@class Person;

@interface Photo :  NSManagedObject  
{
}

@property (nonatomic, retain) NSData * imageData;
@property (nonatomic, retain) NSNumber * Latitude;
@property (nonatomic, retain) NSString * ImageName;
@property (nonatomic, retain) NSString * ImagePath;
@property (nonatomic, retain) NSNumber * Longitude;
@property (nonatomic, retain) Person * PhotoToPerson;

@end

Photo.m

#import "Photo.h"

#import "Person.h"

@implementation Photo 

@dynamic imageData;
@dynamic Latitude;
@dynamic ImageName;
@dynamic ImagePath;
@dynamic Longitude;
@dynamic PhotoToPerson;

@end

这是我创建的mapViewController.m类.如果我运行它,CLLocationDegrees CLLat和CLLong行:

                CLLocationDegrees CLLat = (CLLocationDegrees)photo.Latitude;    
                CLLocationDegrees CLLong = (CLLocationDegrees)photo.Longitude;

给我错误:指向预期浮点值的指针值. …