Yes, check the documentation for the NSSplitViewDelegate protocol .
Basically, all you have to do is set up a delegate for your NSSplitView and implement one or more of these three methods:
Separation limit
– splitView:constrainMaxCoordinate:ofSubviewAt:
– splitView:constrainMinCoordinate:ofSubviewAt:
– splitView:constrainSplitPosition:ofSubviewAt:
, . delegate, NSSplitView, , , - , NSSplitViewDelegate. setDelegate: .