+ entityForName: nil не является допустимым параметром NSManagedObjectContext, ищущим имя сущности 'Account' '
Я перепробовал много вариантов, но не могу найти решение этой проблемы. Я создал файл Core Data и назвал сущность Account, создал строковый атрибут с именем username. Затем отредактировал класс сущности в NSManagedObject, не уверенный, если это правильно. Теперь следующий код находится в моем LoginViewController:
- (void)viewDidLoad
{
[super viewDidLoad];
ITAppDelegate *appDelegate = (ITAppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = appDelegate.managedObjectContext;
Account *newAccount = [NSEntityDescription insertNewObjectForEntityForName:@"Account" inManagedObjectContext:context];
[newAccount setValue:@"Jorge" forKey:@"username"];
[newAccount setPassword:@"password"];
NSLog(@"username:%@ password: %@", [newAccount username], [newAccount password]);
}
Я последовал заЭтот урок и мои файлы кода выглядят так:
ITAppDelegate.h
#import <UIKit/UIKit.h>
@interface ITAppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@end
ITAppDelegate.m
#import "ITAppDelegate.h"
#import "LoginViewController.h"
@implementation ITAppDelegate
@synthesize managedObjectContext = _managedObjectContext;
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
@synthesize managedObjectModel = _managedObjectModel;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
return YES;
}
#pragma mark - Core Data stack
- (NSManagedObjectContext *)managedObjectContext
{
if (_managedObjectContext != nil)
{
return _managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil)
{
_managedObjectContext = [[NSManagedObjectContext alloc] init];
[_managedObjectContext setPersistentStoreCoordinator:coordinator];
}
return _managedObjectContext;
}
- (NSManagedObjectModel *)managedObjectModel
{
if (_managedObjectModel != nil)
{
return _managedObjectModel;
}
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"Model" withExtension:@"momd"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return _managedObjectModel;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (_persistentStoreCoordinator != nil)
{
return _persistentStoreCoordinator;
}
return _persistentStoreCoordinator;
}
@end
AccountBase.h
#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
@interface AccountBase : NSManagedObject
@property (nonatomic, retain) NSString *username;
@end
AccountBase.m
#import "AccountBase.h"
@implementation AccountBase
@dynamic username;
@end
Account.h
#import "AccountBase.h"
#import <CoreData/CoreData.h>
@interface Account : AccountBase
@property (nonatomic, assign) NSString *password;
@end
Account.m
#import "Account.h"
#import "KeychainHelper.h"
@implementation Account
- (NSString*)password
{
if (self.username)
return [KeychainHelper getPasswordForKey:self.username];
return nil;
}
- (void)setPassword:(NSString*)aPassword
{
if (self.username)
[KeychainHelper setPassword:aPassword forKey:self.username];
}
- (void)prepareForDeletion
{
if (self.username)
[KeychainHelper removePasswordForKey:self.username];
}
@end
KeychainHelper.h
#import <Foundation/Foundation.h>
@interface KeychainHelper : NSObject
+ (NSString*)getPasswordForKey:(NSString*)aKey;
+ (void)setPassword:(NSString*)aPassword forKey:(NSString*)aKey;
+ (void)removePasswordForKey:(NSString*)aKey;
@end
KeychainHelper.m
#import "KeychainHelper.h"
#import <Security/Security.h>
@interface KeychainHelper ()
+ (NSMutableDictionary*)dictionaryForKey:(NSString*)aKey;
@end
@implementation KeychainHelper
static const NSString *ironTrainers = @"com.domain.myapplication";
+ (NSMutableDictionary*)dictionaryForKey:(NSString*)aKey
{
NSData *encodedKey = [aKey dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *searchDictionary = [NSMutableDictionary dictionary];
[searchDictionary setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass];
[searchDictionary setObject:encodedKey forKey:(__bridge id)kSecAttrGeneric];
[searchDictionary setObject:encodedKey forKey:(__bridge id)kSecAttrAccount];
[searchDictionary setObject:ironTrainers forKey:(__bridge id)kSecAttrService];
return searchDictionary;
}
+ (NSString*)getPasswordForKey:(NSString*)aKey
{
NSString *password = nil;
NSMutableDictionary *searchDictionary = [self dictionaryForKey:aKey];
[searchDictionary setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit];
[searchDictionary setObject:(id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];
CFTypeRef result = NULL;
BOOL statusCode = SecItemCopyMatching((__bridge CFDictionaryRef)searchDictionary, &result);
if (statusCode == errSecSuccess) {
NSData *resultData = CFBridgingRelease(result);
password = [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
}
return (__bridge NSString *)(result);
}
+ (void)removePasswordForKey:(NSString*)aKey
{
NSMutableDictionary *keyDictionary = [self dictionaryForKey:aKey];
SecItemDelete((__bridge CFDictionaryRef)keyDictionary);
}
+ (void)setPassword:(NSString*)aPassword forKey:(NSString*)aKey
{
[KeychainHelper removePasswordForKey:aKey];
NSData *encodedPassword = [aPassword dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *keyDictionary = [self dictionaryForKey:aKey];
[keyDictionary setObject:encodedPassword forKey:(__bridge id)kSecValueData];
SecItemAdd((__bridge CFDictionaryRef)keyDictionary, nil);
}
@end
Любая помощь приветствуется. Благодарю.