Ios iPhone核心数据预设

使用内容初始化核心数据数据库的最佳方法是什么。我的iPhone应用程序将有一个包含产品（数据和图像）的静态数据库。如何/在何处存储图像，如何预填充数据库？

以下是我所做的：

• 在iPhone应用程序中创建数据库
• 我在XCode中创建了模型，并对数据库进行了查询（这将创建数据库）
• 我的静态数据是一个CSV文件
• 使用Ruby脚本读取CSV文件
• 使用ruby gem sqlite3将数据插入数据库
• 复制回项目中

备选方案：

• 在应用程序内存储包含数据的CSV/XML文件
• 在启动时对其进行解析并创建NSManagedObject

工具/资源：

• 用于编辑/查看sqlite3数据库的软件

数据库位置： 恐怕我记不得了，但当你使用模拟器时，你的应用程序将被构建并复制到一个目录中。我认为您的应用程序的路径是这样的。根据设置方式，数据库通常位于Documents文件夹中

~User/Library/Application Settings/iOS Simulator/<version>/<app id>/

~用户/库/应用程序设置/iOS模拟器///

参考苹果官方文档提供了一种将数据预填充到核心数据的方法：

在我自己的应用程序中，我将AppDeledate中的函数“NSPersistentStoreCoordinator”替换为以下函数：

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator{
if (_persistentStoreCoordinator != nil) {
    return _persistentStoreCoordinator;
}

NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"CoreDataBooks.CDBStore"];

/*
 Set up the store.
 For the sake of illustration, provide a pre-populated default store.
 */
NSFileManager *fileManager = [NSFileManager defaultManager];
// If the expected store doesn't exist, copy the default store.
if (![fileManager fileExistsAtPath:[storeURL path]]) {
    NSURL *defaultStoreURL = [[NSBundle mainBundle] URLForResource:@"CoreDataBooks" withExtension:@"CDBStore"];
    if (defaultStoreURL) {
        [fileManager copyItemAtURL:defaultStoreURL toURL:storeURL error:NULL];
    }
}

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];

NSError *error;
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
    /*
     Replace this implementation with code to handle the error appropriately.

     abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 

     Typical reasons for an error here include:
     * The persistent store is not accessible;
     * The schema for the persistent store is incompatible with current managed object model.
     Check the error message to determine what the actual problem was.


     If the persistent store is not accessible, there is typically something wrong with the file path. Often, a file URL is pointing into the application's resources directory instead of a writeable directory.

     If you encounter schema incompatibility errors during development, you can reduce their frequency by:
     * Simply deleting the existing store:
     [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil]

     * Performing automatic lightweight migration by passing the following dictionary as the options parameter:
     @{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES}

     Lightweight migration will only work for a limited set of schema changes; consult "Core Data Model Versioning and Data Migration Programming Guide" for details.

     */
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
}

return _persistentStoreCoordinator;

}

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希望这能奏效，祝你好运

如何准确复制数据库？数据库是在模拟器上创建的。如何将此数据库打包到appstore的最终应用程序中？@xpepermint-更新了我的帖子，但记不起我头顶上的确切位置，但希望这足够近