evaluatePredicate(in:)
Returns a Boolean value indicating whether the rule has been satisfied in the context of the specified rule system.
Declaration
func evaluatePredicate(in system: GKRuleSystem) -> BoolReturn Value
true if the rule is satisfied (and its action should be executed); otherwise, false.
Discussion
A rule system calls this method when evaluating its rules.
If the rule was created with the init(predicate:assertingFact:grade:) or init(predicate:retractingFact:grade:), calling this method returns the result of testing the predicate against the provided rule system. If the rule was created with the init(blockPredicate:action:) method, calling this method calls the predicate block and returns the result. Otherwise, this method always returns false—subclasses should override this method to implement their own predicate tests.