Returns the maximum possible position of the divider at the specified index.
- macOS 10.5+
The index of the divider.
A CGFloat specifying the maximum possible position of the divider.
The position is "possible" in that it is dictated by the bounds of the receiver and the current position of other dividers. "Allowable" positions are those that result from letting the delegate apply constraints to the possible positions.
You can invoke this method to determine the range of values that can be usefully passed to
You can also invoke it from delegate methods like
split to implement relatively complex behaviors that depend on the current state of the split view.
The results of invoking this method when
adjust has not been invoked, and the subview frames are invalid, is undefined.