CoreData错误而失败

Question

在我的应用程序已经使用在与核心数据的代码，

#import <Foundation/Foundation.h> 
#import <CoreData/CoreData.h> 
@interface Adduser : NSManagedObject 
@property (nonatomic, retain) NSString * name; 
@property (nonatomic, retain) NSString * password; 
@property (nonatomic, retain) NSString * email; 
@property (nonatomic, retain) NSString * contact_no; 
@property (nonatomic, retain) NSString * address; 
@property (nonatomic, retain) NSString * response; 
@end 

方法

-(IBAction)signup:(id)sender 
{ 
Registration *adduser=[Registration new];//<-CoreData: error: Failed to call designated initializer on NSManagedObject class 'Registration' 
adduser.name=txt1.text; 
adduser.password=txt2.text; 
adduser.email=txt3.text; 
adduser.contact_no=txt5.text; 
adduser.address=txtvu.text; 
} 

当我试图实现是显示

CoreData: error: Failed to call designated initializer on NSManagedObject class 'Registration' 

与SIGABRT错误？我的代码有什么问题？请帮忙

Answer 1

要创建被管理对象类的实例，您需要：

Registration *adduser = [NSEntityDescription insertNewObjectForEntityForName:@"Registration" inManagedObjectContext:context];