Question

试图让这个在Swift 2.0中运行，错误说：

类型NSJSONWritingOptions不符合协议NilLiteralConvertible

在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 ""
}

Answer 1

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

是swift 2.0的正确语法

Answer 2

你也可以传递一个空数组，没有选项：

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

在Swift 2中使用NSSerialization.datawithJSON

2 个答案: