ios - 在 coredata 中存储 NSdate 时出错

Question

我想将当前日期存储到核心数据中。该实体称为 Emotions，具有多个属性(float)和一个名为 timeStamp(Date)的属性。 float 属性没有任何问题。但是当我尝试像这样存储日期时:

emotionAppDelegate * appDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *emotion =
[appDelegate managedObjectContext];
NSManagedObject *newEmotions;
newEmotions = [NSEntityDescription
              insertNewObjectForEntityForName:@"Emotions"
              inManagedObjectContext:emotion];
[newEmotions setValue:[NSData data] forKey:@"timeStamp"];

我收到一个错误:

2012-11-25 21:03:09.130 silder[4634:c07] Unresolved error Error Domain=NSCocoaErrorDomain Code=134100 "The operation couldn’t be completed. (Cocoa error 134100.)" UserInfo=0x8174b20 {metadata={
NSPersistenceFrameworkVersion = 419;
NSStoreModelVersionHashes =     {
    Emotions = <c8b9e393 5624a477 dee1958e 19dd1209 acb67cd9 56daefea dbf8bfc9 daa8e34d>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers =     (
    ""
);
NSStoreType = SQLite;
NSStoreUUID = "5CE10BB2-A77A-4E8B-AAE6-5973000DFADA";
"_NSAutoVacuumLevel" = 2;

}, Reason=用于开设商店的模型与用于创建商店的模型不兼容}, { 元数据={ NSPersistenceFrameworkVersion = 419； NSStoreModelVersionHashes = { 情绪=； }; NSStoreModelVersionHashesVersion = 3; NSStoreModelVersionIdentifiers = ( ”” )； NSStoreType = SQLite; NSStoreUUID = "5CE10BB2-A77A-4E8B-AAE6-5973000DFADA"; “_NSAutoVacuumLevel”= 2； }; Reason = "用于开设商店的模型与用于创建商店的模型不兼容";}

谁能帮帮我？非常感谢!

Answer 1

以某种方式更改数据库模型，尝试重置模拟器并再次运行应用程序