Question

I want to add a button that when pressed will lock two sliders together such that the values for the two sliders will always be the same.

I have a solution for this using code, but I’m wondering if there is a way to do this with interface builder alone.

I am worried that the code based solution that one slider may lag behind the other in high CPU utilization environments.

Answer 1

No, there is no way to do this with Interface Builder alone.

Actually everything becomes code in the end, as far as I understand, Interface Builder was built to improve the development time, not necessarily to improve performance, I found this interesting quote on Apple’s site about NIBs:

Xcode works in conjunction with these frameworks to help you connect
the controls of your user interface to the objects in your project
that respond to those controls.

Taking into account that, everything will become code (of some level). About NIB files.

At runtime, these descriptions are used to recreate the objects and
their configuration inside your application. When you load a nib file
at runtime, you get an exact replica of the objects that were in your
Xcode document. The nib-loading code instantiates the objects,
configures them, and reestablishes any inter-object connections that
you created in your nib file.

If you would really want to avoid such behavior probably the best you would be able to do is create the widget from scratch, but that would be a totally different question.

Just curious, why wouldn’t you want to use code?