一个iphone / ipad通用应用程序有两个不同的xcdatamodel文件？ [英] Can a iphone/ipad universal app have two different xcdatamodel files?

问题描述

我不想通过现有的iphone应用程序进行数据迁移。可以让ipad版本使用不同的xcdatamodel文件比iphone版本？

I dont want to go through the data migration with an existing iphone app. Is is possible to have the ipad version use a different xcdatamodel file than the iphone version?

我搜索项目文件，它引用myapp.xcdatamodel，并找不到它的地方

I search the project files where it reference myapp.xcdatamodel and cant find where it gets hooked up.

任何建议？

appdelegate在哪里设置？

Where is the appdelegate does it set this?

我看到：

NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"storeLocations.sqlite"]];

推荐答案

永久存储协调器或任何其他部分核心数据。

There's nothing magical about the persistent store coordinator or any other part of core data. They're just objects with methods and properties, like anything else.

在您的应用程式委托中，您只需要指定多个，a la：

In your app delegate you just need to specify more than one, a la:

header

NSManagedObjectContext *managedObjectContext;
NSManagedObjectModel *managedObjectModel;
NSPersistentStoreCoordinator *persistentStoreCoordinator;

NSManagedObjectContext *managedObjectContext2;
NSManagedObjectModel *managedObjectModel2;
NSPersistentStoreCoordinator *persistentStoreCoordinator2;

实施

- (NSManagedObjectContext *)managedObjectContext {

  if (managedObjectContext != nil) {
    return managedObjectContext;
  }

  NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
  if (coordinator != nil) {
    managedObjectContext = [[NSManagedObjectContext alloc] init];
    [managedObjectContext setPersistentStoreCoordinator:coordinator];
  }
  return managedObjectContext;
} 

和

- (NSManagedObjectContext *)managedObjectContext2 {

  if (managedObjectContext2 != nil) {
    return managedObjectContext2;
  }

  NSPersistentStoreCoordinator *coordinator2 = [self persistentStoreCoordinator2];
  if (coordinator2 != nil) {
    managedObjectContext2 = [[NSManagedObjectContext alloc] init];
    [managedObjectContext2 setPersistentStoreCoordinator:coordinator2];
  }
  return managedObjectContext2;
} 

等。

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