迁移持久性商店崩溃

我有一个开关打开或closuresiOS 7应用程序的iCloud。 iCloud同步工作正常。 当iCloud打开时，我将其closures，我称之为：

- (void)migrateiCloudStoreToLocalStore { NSError *error; __weak NSPersistentStoreCoordinator *psc = self.managedObjectContext.persistentStoreCoordinator; NSDictionary *options = @{NSMigratePersistentStoresAutomaticallyOption:@YES, NSPersistentStoreRemoveUbiquitousMetadataOption : @YES}; NSPersistentStore *currentStore = [psc persistentStores][0]; NSLog(@"iCloud Store - %@", currentStore); NSLog(@"Local Store - %@", self.store); [psc migratePersistentStore:currentStore toURL:self.store options:options withType:NSSQLiteStoreType error:&error]; 

}

我可以看到两个存储都存在，但是当migratePersistentStore:toURL:options:withType:error:被调用时，它仍然崩溃。

这是我得到的错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM replaceObjectAtIndex:withObject:]: object cannot be nil' *** First throw call stack: (0x2e0a3fd3 0x38850ccf 0x2dfdf29f 0x2de9e7f7 0xa9b61 0xb2305 0xb019f 0x309de05f 0x30a90377 0x3093f6f5 0x308b855b 0x2e06f2a5 0x2e06cc49 0x2e06cf8b 0x2dfd7f4f 0x2dfd7d33 0x32edc663 0x3092316d 0x30289 0x38d5dab7) libc++abi.dylib: terminating with uncaught exception of type NSException

任何想法为什么发生这种情况？ 这有点奇怪，因为在我的其他设备之一，它在这一点上不会崩溃。

Answer 1

尝试这个

 [psc removePersistentStore:currentStore error:nil]; [psc migratePersistentStore:currentStore toURL:self.store options:options withType:NSSQLiteStoreType error:&error]; [psc addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:self.store options:options /* options for local store */ error:nil]; 

更新：新的解决scheme

 NSPersistentStoreCoordinator * persistentStoreCoordinator = self.persistentStoreCoordinator; NSPersistentStore * persistentStore = [[persistentStoreCoordinator persistentStores] firstObject]; NSMutableDictionary * localStoreOptions = [[self localPersistentStoreOptions] mutableCopy]; [localStoreOptions setObject:@YES forKey:NSPersistentStoreRemoveUbiquitousMetadataOption]; [[NSFileManager defaultManager] copyItemAtPath:persistentStore.URL.path toPath:[self storeURL].path error:nil]; NSPersistentStoreCoordinator * newPersistentStoreCoordinator; newPersistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; [newPersistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:[self storeURL] options:localStoreOptions error:nil]; [self setPersistentStoreCoordinator:newPersistentStoreCoordinator]; [self setupManagedObjectContext]; //initialize new moc with new persistent store coordinator