NSManagedObjectModel *mom = [self managedObjectModel];
    NSDictionary *attrs = [[[mom entitiesByName] objectForKey:@"Course"] attributesByName];
    NSArray *keyedValues = [[NSArray alloc] initWithContentsOfFile:                                        
                                    [[NSBundle mainBundle] pathForResource:@"courses" ofType:@"plist"]                                        
                            ];       
        
    for( NSDictionary *keyedValueDict in keyedValues ) {
        NSManagedObject *mObj = [NSEntityDescription insertNewObjectForEntityForName:@"Course" inManagedObjectContext:[self managedObjectContext]];
        for (NSString *attribute in attrs) {
            id value = [keyedValueDict objectForKey:attribute];
            if (value == nil) {
                // Don't attempt to set nil, or you'll overwite values in self that aren't present in keyedValues
                continue;
            }
            NSAttributeType attributeType = [[attrs objectForKey:attribute] attributeType];
            if ((attributeType == NSStringAttributeType) && ([value isKindOfClass:[NSNumber class]])) {
                value = [value stringValue];
            } else if (((attributeType == NSInteger16AttributeType) || (attributeType == NSInteger32AttributeType) || (attributeType == NSInteger64AttributeType) || (attributeType == NSBooleanAttributeType)) && ([value isKindOfClass:[NSString class]])) {
                value = [NSNumber numberWithInteger:[value  integerValue]];
            } else if ((attributeType == NSFloatAttributeType) && ([value isKindOfClass:[NSString class]])) {
                value = [NSNumber numberWithDouble:[value doubleValue]];
            }              
            [mObj setValue:value forKey:attribute];
            NSLog(@"Value %@ for Key %@", value, attribute);
        }
        
    }
    NSError *error;
    [[self managedObjectContext] save:&error];

NSManagedObjectModel *mom = [self managedObjectModel];
    NSDictionary *attrs = [[[mom entitiesByName] objectForKey:@"Course"] attributesByName];
    NSArray *keyedValues = [[NSArray alloc] initWithContentsOfFile:                                        
                                    [[NSBundle mainBundle] pathForResource:@"courses" ofType:@"plist"]                                        
                            ];       
        
    for( NSDictionary *keyedValueDict in keyedValues ) {
        NSManagedObject *mObj = [NSEntityDescription insertNewObjectForEntityForName:@"Course" inManagedObjectContext:[self managedObjectContext]];
        for (NSString *attribute in attrs) {
            id value = [keyedValueDict objectForKey:attribute];
            if (value == nil) {
                // Don't attempt to set nil, or you'll overwite values in self that aren't present in keyedValues
                continue;
            }
            NSAttributeType attributeType = [[attrs objectForKey:attribute] attributeType];
            if ((attributeType == NSStringAttributeType) && ([value isKindOfClass:[NSNumber class]])) {
                value = [value stringValue];
            } else if (((attributeType == NSInteger16AttributeType) || (attributeType == NSInteger32AttributeType) || (attributeType == NSInteger64AttributeType) || (attributeType == NSBooleanAttributeType)) && ([value isKindOfClass:[NSString class]])) {
                value = [NSNumber numberWithInteger:[value  integerValue]];
            } else if ((attributeType == NSFloatAttributeType) && ([value isKindOfClass:[NSString class]])) {
                value = [NSNumber numberWithDouble:[value doubleValue]];
            }
            //[self setValue:value forKey:attribute];  
            [mObj setValue:value forKey:attribute];
            NSLog(@"Value %@ for Key %@", value, attribute);
        }
        
    }
    NSError *error;
    [[self managedObjectContext] save:&error];

Just change the filename "courses" to that of your own and the entity name "Course" to your own.

Core Data Import from Plist

data

Objective C