0
我有一个名为天气在我的核心数据在以下形式的实体:尝试访问核心数据模型的NSNumber的属性给EXC_BAD_ACCESS
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@interface WeatherModel : NSManagedObject
@property (nonatomic, retain) NSString * cityName;
@property (nonatomic, retain) NSNumber * latitude;
@property (nonatomic, retain) NSNumber * longitude;
@property (nonatomic, retain) NSNumber * temperature;
@property (nonatomic, retain) NSNumber * humidity;
@property (nonatomic, retain) NSNumber * windSpeed;
@property (nonatomic, retain) NSNumber * rain;
@property (nonatomic, retain) NSDate * date;
@property (nonatomic, retain) NSString * iconId;
@property (nonatomic, retain) NSString * units;
@end
我保存这个模型的核心数据的情况下,如下:
WeatherModel *bookmarkWeatherModel = (WeatherModel*)[DatabaseHelper insertNewEntityWithName:@"Weather" andContext:self.weatherManagedObjectContext];
[bookmarkWeatherModel setLatitude:[NSNumber numberWithDouble:0.0]];
[bookmarkWeatherModel setLongitude:[NSNumber numberWithDouble:0.0]];
[bookmarkWeatherModel setCityName:@"CityA"];
NSLog(@"%@", bookmarkWeatherModel.cityName);
NSLog(@"%@", bookmarkWeatherModel.latitude);
[DatabaseHelper saveCoreData:self.weatherManagedObjectContext];
但是每当我试图(甚至称saveCoreData方法之后)访问任何NSNumber的属性,在DatabaseHelperI get this error.
insertNewEntityWithName方法:
+ (NSManagedObject *)insertNewEntityWithName:(NSString *)entityName
andContext:(NSManagedObjectContext *)managedObjectContext {
NSManagedObject *entity = [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:managedObjectContext];
return entity;
}
我想在我的模型,只抛出这个错误性质访问的每一个属性的类型的NSNumber的。其他人工作得很好。
它们是否在您的模型中正确设置为数字? –
此外,您可以安全地将它们从NSNumber更改为原始类型(Int,Double,模型中设置的任何值)的安全性。你所要做的就是改变财产和核心数据的类型。这可以使不必拆开NSNumbers更容易。 –