On May 14, 2015, at 08:40 , William Squires <wsqui...@satx.rr.com> wrote:
>
> I'd like to know how to properly write a value transformer in Swift.
Something like this, I expect:
> class StringNotNilTransformer: NSObject {
>
> static var transformedValueClass: AnyClass { return NSNumber.self }
> static let allowsReverseTransformation = false
>
> func transformedValue (value: AnyObject?) -> AnyObject? {
> if let string = value as? String {
> return NSNumber (bool: string != "");
> }
> return NSNumber (bool: false);
> }
> }
I only checked this in a playground, but I suspect the following slightly
simpler version would also work too:
> class StringNotNilTransformer: NSObject {
>
> static var transformedValueClass: AnyClass { return NSNumber.self }
> static let allowsReverseTransformation = false
>
> func transformedValue (value: AnyObject?) -> AnyObject? {
> if let string = value as? String {
> return string != "";
> }
> return false;
> }
> }
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