iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK

Adding Attributes

To add attributes to an entity, first select the entity in either the graph or the list of entities. Then click the Add Attribute button in the lower part of the editor, just to the left of the Editor Style buttons. Xcode will add an attribute called attribute to the entity. Select a Type for the attribute. (See Table 13.1 for supported data types.) Note that Core Data treats all attributes as Objective-C objects, so if Integer 32 is the selected data type, for example, Core Data will treat the attribute as an NSNumber.

Table 13.1 Core Data Supported Data Types

One thing to note is that Core Data will automatically give each ...