Swift: Converting NSNumber into NSString (NSNumber is not a subtype of NSString)

Question

In my app, I'm going into CoreData and grabbing an entry whose type is a Double, then I'm trying to put that value into a text field in my app.

This looks like

lengthTextField.text = lastSession.length but I'm getting the error NSNumber is not a subtype of NSString

The value of lastSession.length is 6.0 for reference. Any suggestions on how to properly put that data in my text field?

Thanks!

Answer 1

In core data numbers are backed by NSNumber. You can view the documentation here

In swift you can access the string representation of the number through the instance property stringValue

lengthTextField.text = lastSession.length.stringValue