iphone - ios 核心数据无法使用此代码找到实体名称 'Cartdetail' 的 NSManagedObjectModel

Question

您好，我正在创建一个应用程序，它需要将我的标签内容中的数据保存到我的核心数据模型中，该模型被命名为 cart.xcdatamodeld，我的实体被命名为 Cartdetail。当我在我的应用程序中按下保存按钮时，我出现以下错误...

- (void)viewDidLoad {    
if (managedObjectContext == nil) { 
managedObjectContext = [(AppDelegate *)[[UIApplication sharedApplication] delegate]managedObjectContext];
}
}

- (IBAction)SaveTest:(id)sender {

ViewController2 *second = (ViewController2 *)[NSEntityDescription insertNewObjectForEntityForName:@"Cartdetail" inManagedObjectContext:managedObjectContext];
}


*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Cartdetail''
*** Call stack at first throw:
(
0   CoreFoundation                      0x010265a9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x01444313 objc_exception_throw + 44
2   CoreData                            0x00036ebb +[NSEntityDescription entityForName:inManagedObjectContext:] + 187
3   CoreData                            0x0006e9eb +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] + 59
4   tablevc                             0x00009c97 -[Description alertView:clickedButtonAtIndex:] + 519
5   UIKit                               0x00621c5f -[UIAlertView(Private) _buttonClicked:] + 296
6   UIKit                               0x002784fd -[UIApplication sendAction:to:from:forEvent:] + 119
7   UIKit                               0x00308799 -[UIControl sendAction:to:forEvent:] + 67
8   UIKit                               0x0030ac2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
9   UIKit                               0x003097d8 -[UIControl touchesEnded:withEvent:] + 458
10  UIKit                               0x0029cded -[UIWindow _sendTouchesForEvent:] + 567
11  UIKit                               0x0027dc37 -[UIApplication sendEvent:] + 447
12  UIKit                               0x00282f2e _UIApplicationHandleEvent + 7576
13  GraphicsServices                    0x01c34992 PurpleEventCallback + 1550
14  CoreFoundation                      0x01007944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
15  CoreFoundation                      0x00f67cf7 __CFRunLoopDoSource1 + 215
16  CoreFoundation                      0x00f64f83 __CFRunLoopRun + 979
17  CoreFoundation                      0x00f64840 CFRunLoopRunSpecific + 208
18  CoreFoundation                      0x00f64761 CFRunLoopRunInMode + 97
19  GraphicsServices                    0x01c331c4 GSEventRunModal + 217
20  GraphicsServices                    0x01c33289 GSEventRun + 115
21  UIKit                               0x00286c93 UIApplicationMain + 1160
22  tablevc                             0x00001d4a main + 170
23  tablevc                             0x00001c95 start + 53
 )
 terminate called throwing an exception

我是 iOS 新手..请帮助我..谢谢..

Answer 1

您可能还没有在 AppDelegate 中设置托管对象上下文!看一下apple提供的iPhoneCoreDataRecipes例子的AppDelegate实现: iPhoneCoreDataRecipes example