ios - 在 CoreData 表中插入 50 个对象

Question

我想在coredata ta中插入50个值

 Question.h

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>


@interface Question : NSManagedObject

@property (nonatomic, retain) NSString * question;
@property (nonatomic, retain) NSString * answer;
@property (nonatomic, retain) NSString * mcqsa;
@property (nonatomic, retain) NSString * mcqsb;
@property (nonatomic, retain) NSString * mcqsc;
@property (nonatomic, retain) NSString * mcqsd;



Question.m
#import "Question.h"


@implementation Question

@dynamic question;
@dynamic answer;  
@dynamic mcqsa;
@dynamic mcqsb;
@dynamic mcqsc;
@dynamic mcqsd;

@end

插入代码

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {

    NSManagedObjectContext *context = [self managedObjectContext];


    Question *question = [NSEntityDescription
                                  insertNewObjectForEntityForName:@"Question"
                                  inManagedObjectContext:context];
question.question = @"What is capital of Australia?";
question.answer = @"Testville";
question.mcqsa = @"Sydney";
question.mcqsb = @"Canbera";
question.mcqsc =  @"Berlin";
question.mcqsd = @"Bern";

NSError *error;
if (![context save:&error]) {
    NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
}
.......

如何插入多个数据，50 个问题及其 mcq(50 个问题对象)？ 有没有使用其他东西的手动方法？

Answer 1

MagicalRecord CoreData 的包装器提供了一些不错的导入功能。您需要在包中包含需要作为 plist/json 导入的数据。

在初始运行时，您将数据导入到 coreData。

您可以在以下链接中找到关于相同内容的精彩教程 Importing data made easy

你需要创建NSManagedObject的子类

您可以对它们调用 importFromObject: 或 importFromObject:。如果您可以完全控制数据的结构，这将立即发生，而无需编写用于将存储的数据映射到核心数据实体的单个代码。