Mac Catalyst When to Handle Setting Min/Max Size for UISplitViewController columns? Window Resize Event?

Trying to use UISplitViewController. Since this app can be run on many different monitor sizes I want to allow the splits to be resized reasonably. There is this API:

//Allow setting the primary column width with point values. This is especially useful in Catalyst where the window may be resized more often.

// If set to non-Automatic, takes precedence over preferredPrimaryColumnWidthFraction.

@property(nonatomic, assign) CGFloat preferredPrimaryColumnWidth API_AVAILABLE(ios(14.0)); // default: UISplitViewControllerAutomaticDimension
> > @property(nonatomic, assign) CGFloat minimumSupplementaryColumnWidth API_AVAILABLE(ios(14.0));

@property(nonatomic, assign) CGFloat maximumSupplementaryColumnWidth API_AVAILABLE(ios(14.0));

// An animatable property that can be used to adjust the minimum absolute width of the primary view controller in the split view controller.

@property(nonatomic, assign) CGFloat minimumPrimaryColumnWidth API_AVAILABLE(ios(8.0)); // default: UISplitViewControllerAutomaticDimension



// An animatable property that can be used to adjust the maximum absolute width of the primary view controller in the split view controller.

@property(nonatomic, assign) CGFloat maximumPrimaryColumnWidth API_AVAILABLE(ios(8.0)); // default:

At what point in time should I be changing the preferredPrimaryColumnWidth, the min/and max width values? What event? If I was in Appkit I could maybe use something like NSWindowDidResizeNotification, then compute min/max sizes for each column based off the current window size (but I think NSSplitView gives the delegate an opportunity to control constraining column sizes if I remember correctly so I don't think that it would necessary to listen for a window resize event).

I find the default sizes set by UISplitViewController to be insufficient (I want to allow users to size columns wider). Ideally this would be easier if there was minimumPrimaryColumnFraction and maxPrimaryColumnFraction. Then I just set the min/max fractions once to reasonable values and not worry about changing them on window resize. But since we can only set min/max with a hardcoded point size it seems more complicated?