ios – swift中自定义NSManagedObject类核心数据的问题

Users.h

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


@interface Users : NSManagedobject

@property (nonatomic,retain) Nsstring * password;
@property (nonatomic,retain) Nsstring * username;

- (Nsstring *)toString;
- (void)addFunny:(Nsstring *)prefix;

@end

Users.m

#import "Users.h"


@implementation Users

@dynamic password;
@dynamic username;

- (Nsstring *)toString
{
    return @"The username is \(username) and password is \(password)";
}

- (void)addFunny:(Nsstring *)prefix
{
    self.username = [Nsstring stringWithFormat:@"%@%@",prefix,self.username];
}

@end

这是数据模型截图：

这是保存功能：

@IBAction func btnSave_Clicked(){
        println("Save \(txtUsername.text)")

        let appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
        let context: NSManagedobjectContext = appDel.managedobjectContext
        let ent = NSEntityDescription.entityForName("Users",inManagedobjectContext: context)

        var newUser = Users(entity: ent,insertIntoManagedobjectContext: context)
        newUser.username = txtUsername.text
        newUser.password = txtPassword.text

        context.save(nil)
        println(newUser)

    }

来自lldb的代码：

Unresolved error Error Domain=NSCocoaErrorDomain Code=134100 "The operation Couldn’t be completed. (Cocoa error 134100.)" UserInfo=0xb736c50 {Metadata={
    NSPersistenceFrameworkVersion = 508;
    NsstoreModelVersionHashes =     {
        Entity = <b2bc8535 3bcfcdf1 81eecadc d32d8511 cc030525 d4eb7d76 94d11d7c f5853918>;
    };
    NsstoreModelVersionHashesversion = 3;
    NsstoreModelVersionIdentifiers =     (
        ""
    );
    NsstoreType = sqlite;
    NsstoreUUID = "0169C569-2A57-47F1-9EF6-684485CB1135";
    "_NSAutoVacuumLevel" = 2;
},reason=The model used to open the store is incompatible with the one used to create the store},(error.userInfo)