使用Core数据添加多个测试数据

Question

我是一个新手，从零开始学习核心数据。我已经设置了coredatamodel，然后创建了NSManagedObject类。然后，在应用程序委托中，我尝试插入一些测试数据。然而，它没有正常工作。只插入了最后一个数据。我该把

自saveContext；

在每个物体之间？在"applicationWillTerminate“方法中，调用saveContext方法，因此保存了最后一项。(是对的吗？)

NSManagedObjectContext *context = [self managedObjectContext];

Vocabulary *vocabulary = [NSEntityDescription
                                   insertNewObjectForEntityForName:@"Vocabulary" 
                                   inManagedObjectContext:context];

vocabulary.word = @"iPhone";
vocabulary.definition = @"better than Android";
vocabulary.level = @"beginner";

vocabulary.word = @"iPhone3gs";
vocabulary.definition = @"better than 3";
vocabulary.level = @"intermediate";

vocabulary.word = @"iPhone4";
vocabulary.definition = @"better than 3gs";
vocabulary.level = @"advanced";

vocabulary.word = @"iPhone4s";
vocabulary.definition = @"better than 4";

vocabulary.word = @"iPhone4s";
vocabulary.definition = @"64 is better than 32";
vocabulary.level = @"advanced";

Answer 1

您需要为插入的每个词汇表对象插入一个新实体。所以要这样做：

Vocabulary *vocabulary = nil;
NSManagedObjectContext *context = [self managedObjectContext];

vocabulary = [NSEntityDescription insertNewObjectForEntityForName:@"Vocabulary" inManagedObjectContext:context];
vocabulary.word = @"iPhone";
vocabulary.definition = @"better than Android";
vocabulary.level = @"beginner";

vocabulary = [NSEntityDescription insertNewObjectForEntityForName:@"Vocabulary" inManagedObjectContext:context];
vocabulary.word = @"iPhone3gs";
vocabulary.definition = @"better than 3";
vocabulary.level = @"intermediate";

vocabulary = [NSEntityDescription insertNewObjectForEntityForName:@"Vocabulary" inManagedObjectContext:context];
vocabulary.word = @"iPhone4";
vocabulary.definition = @"better than 3gs";
vocabulary.level = @"advanced";

vocabulary = [NSEntityDescription insertNewObjectForEntityForName:@"Vocabulary" inManagedObjectContext:context];
vocabulary.word = @"iPhone4s";
vocabulary.definition = @"better than 4";

vocabulary = [NSEntityDescription insertNewObjectForEntityForName:@"Vocabulary" inManagedObjectContext:context];
vocabulary.word = @"iPhone4s";
vocabulary.definition = @"64 is better than 32";
vocabulary.level = @"advanced";