NSTextView non-editable in NSSplitview - cocoa

I have an NSSplitView in My window. the left is an NSOutlineView. When I click the OutlineView's item, the right Which is a custom ViewController's view will look like the below:
Screenshot:
then,a problem occurs that the two NSTextView can't editable while editing the textview. however,I have make it possible to edit it.
Screenshot:
Am I missing anything?
Any hint in the right direction is highly appreciated.
Thanks
This is my demo code:github.com/ljz2012008/TestN.git

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