Use NSSerialization.datawithJSON in Swift 2

问题

Been trying to get this to work in Swift 2.0, the error says:

Type NSJSONWritingOptions cannot conform to protocol NilLiteralConvertible

at var options = prettyPrinted...:

func JSONStringify(value: AnyObject,prettyPrinted:Bool = false) -> String {

    var options = prettyPrinted ? NSJSONWritingOptions.PrettyPrinted : nil

    if NSJSONSerialization.isValidJSONObject(value) {
        do{
            let data = try NSJSONSerialization.dataWithJSONObject(value, options: options)
            if let string = NSString(data: data, encoding: NSUTF8StringEncoding) {
                return string as String
            }
        } catch {

        }
    }
    return ""
}

回答1:

let options = prettyPrinted ? 
         NSJSONWritingOptions.PrettyPrinted : NSJSONWritingOptions(rawValue: 0)

is the right syntax for swift 2.0

回答2:

You can also pass an empty array for no options:

let options:NSJSONWritingOptions = prettyPrinted ? .PrettyPrinted : []

来源：https://stackoverflow.com/questions/30920766/use-nsserialization-datawithjson-in-swift-2