Prevent NSTextField from being left blank

Question

I have a NSTextField with an NSNumberFormatter inside of it. I've seen textfields that if you leave them blank it just puts whatever number was in it previously back into it. I'm curious if there's a setting in Interface Builder that provides this behavior. I can't seem to find it, but I'm fairly new to IB and might not be looking in the right spot.

Thanks

Answer 1

There's no behaviour that I know of in IB other than the default value (which won't help here), but you could use NSTextFieldDelegate (extension of NSControlTextEditingDelegate) to monitor when editing finishes, using control:textShouldEndEditing: you can throw a value back into the box if it's left blank. You can read about NSTextFieldDelegate here.