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Int16 master data as optional

  • In Swift, how do you make the NSManaged Int16

    be property optional

    like this:

    NSManaged var durationType: Int16?

    I am getting compiler error: roperty cannot be marked @NSManaged because its type cannot be represented in Objective-C

  • If this is not possible and I check the window optional

    in the Core Data Model Editor, how can I check if this property has a value when I exit the database?

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1 answer


You can make the property optional and save it Int16

. The key is that it is @NSManaged

not required, but if you remove it, you must implement your own accessor methods.

One possible implementation:



var durationType: Int16?
    {
    get {
        self.willAccessValueForKey("durationType")
        let value = self.primitiveValueForKey("durationType") as? Int
        self.didAccessValueForKey("durationType")

        return (value != nil) ? Int16(value!) : nil
    }
    set {
        self.willChangeValueForKey("durationType")

        let value : Int? = (newValue != nil) ? Int(newValue!) : nil
        self.setPrimitiveValue(value, forKey: "durationType")

        self.didChangeValueForKey("durationType")
    }
}
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