CODEWITHSUNDEEP
iosswiftcore-data
danielv
danielv

Reputation: 3107

Implementing Core Data validation methods in Swift

How do I implement the Core Data validation methods (these take the form validate<Key>:error: in Obj-C) in Swift?

In Obj-C, I would write the following in my model class to validate the name attribute:

-(BOOL)validateName:(id *)name error:(NSError **)outError {

}

And I could cast the name to NSString by doing: ((NSString *)(*name))

In Swift, I assume this looks something like:

func validateName(name: AutoreleasingUnsafeMutablePointer<AnyObject?>, error: NSErrorPointer) -> Bool {
}

Is this the correct form?

How do I cast then the name to Swift's String?

Upvotes: 1

Views: 637

Answers (1)

danielv
danielv

Reputation: 3107

The documentation on this is very sparse and there isn't much information about it around the web. Adding here as reference for others what I was able to find via some digging and trail and error.

This seems to be working:

// Validating the 'name' attribute of NSManagedObject's descendant
func validateName(name: AutoreleasingUnsafeMutablePointer<AnyObject?>, error: NSErrorPointer) -> Bool {

    if let name = name.memory as? String {
        // do validation here when name is not nil
    } else {
        // when name is nil
        return false
    } 
}

Upvotes: 3

Related Questions