ios - Core Data: NSFetchedResultsController sorting by date vs. ordered to-many relationship

Question

I am writing a demo messaging app to learn Core Data. In my model, an entity Conversation has a to-many relationship messages to Message. A Message has a timeStamp. I intend to display these messages in a collection view/table view with an NSFetchedResultsController. I want to know what would be the most efficient way to sort these messages. I searched around and found that I could sort the messages using:

• an NSSortDescriptor on message.timeStamp
• making the messages relationship ordered
• adding a sequence property to message

What should be the best way to sort the messages?

Answer 1

排序顺序应该反映您的应用程序逻辑：
在对话中移动消息是否合乎逻辑？（如果是，按序号排序）
您希望您的数据按时间顺序显示吗？（如果是，按 排序timeStamp）

在任何情况下，我都不会使用有序关系作为排序顺序，因为您可能希望 FRC 在表格视图中显示您的数据，他将为您管理内存和更改。
除此之外，您在任何情况下都希望批量获取此关系，而不是简单地让您的表视图数据源成为有序集合关系（这将导致项目被一个接一个地获取）。