A notification posted before a change to the size of some or all subviews of a split view.
- macOS 10.0+
The notification object consists of the
NSSplit object about to resize its subviews.
user dictionary includes the
NSSplit key containing the index of the divider moved by the split view or the user. If the system sent the notification because the user dragged a divider, the dictionary also includes the
NSSplit key with a value of