Using double in Core Data

问题

I'm very new to iOS and swift 2 and I am making an app which would require a double value for the attribute of an entity in core data. There are many tutorials with strings as attributes but no double. Can you please help me by showing an example of how double attribute can be created using core data .I want to store the value in a table view controller. Thanks in advance

来源：https://stackoverflow.com/questions/37958530/using-double-in-core-data