insertArrangedSubview(_:at:)
Adds a view as an arranged split pane at the specified index.
Declaration
func insertArrangedSubview(_ view: NSView, at index: Int)Discussion
If the view is already an arranged view, calling this method moves the view to the specified index in the arrangedSubviews array. This change doesn’t affect the view’s index in the split view’s subviews array.
If the view isn’t a subview of the split view, calling this method adds it to the split view’s subviews array.