customSelector The selector for the receiver. Declarationvar customSelector: Selector? { get } DiscussionNULL if there is none. See AlsoGetting Information About a Comparison PredicatecomparisonPredicateModifierNSComparisonPredicate.ModifierrightExpressionleftExpressionoptionsNSComparisonPredicate.OptionspredicateOperatorTypeNSComparisonPredicate.Operator