Zygote February 2016

Multiple NSPredicates for NSFetchRequest in Swift?

Currently, I have a simple NSFetchRequest with an associated NSPredicate. However, Im hoping there is a way you can append multiple predicates. I've seen examples in Objective C, but none for Swift.

Can you define a list of NSPredicate's or append multiple NSPredicate objects to a single NSFetchRequest somehow?

Thanks!

Answers


Manuel February 2016

You can use "NSCompoundPredicate". For example:

    let converstationKeyPredicate = NSPredicate(format: "conversationKey = %@", conversationKey)
    let messageKeyPredicate = NSPredicate(format: "messageKey = %@", messageKey)
    let andPredicate = NSCompoundPredicate(type: NSCompoundPredicateType.AndPredicateType, subpredicates: [converstationKeyPredicate, messageKeyPredicate])
    request.predicate = andPredicate

You can change into "AndPredicateType" or "OrPredicateType"

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Asked in February 2016
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