ios - 核心数据提取属性 - 基础

Question

使用 Core Data Fetched Properties，我如何执行这个简单的请求:

我希望获取的属性 ( myFetchProp ) 存储 StoreA ，它应该这样做:

[myFetchProp getMeRecordWithPredicate:@“X == 35” inEntity:@“entityH” fromStore:StoreB];

原谅我的错误语法，但我想我的观点很容易理解。

我在网上找不到任何简单明了的例子。我想应该不会那么难。

Answer 1

由于我刚刚阅读了 Marcus S. Zarra 的 Core Data: Data Storage and Management for iOS, OS X, and iCloud (第 2 版)(见 here 和 here )让我引用它的主题:

In practice, I have found fetched properties to be less useful and less flexible than either creating a stored fetch request or building the fetch request in code. Usually when a situation calls for a fetched property, it tends to be easier to subclass the entity in question, perform an NSFetchRequest in code, and return the results.

因此，获取的属性可能很简单的假设可能是错误的。