swift - 如何将 nil 作为 dictionary 的参数传递

Question

我有一个 Dictionary<String, AnyObject> 类型的字典我需要将参数作为 nil 传递:

let params = [
            "number": nil,
            "description": nil,
            "lang" : "spa",
            "byFee": true,
            "plan" : data.Plan
            ] as Dictionary<String, AnyObject>

        request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(params, options: [])

如果我这样做，我会得到一个错误:

所以我尝试将词典更改为 Dictionary<String, AnyObject?>

但是如果我这样做，那么错误就会出现在请求中。HTTPBody:

Answer 1

JSON 中的空值等同于 ObjC/Swift 中的 NSNull:

let params : [String : AnyObject] = [
    "number": NSNull(),
    "description": NSNull(),
    "lang" : "spa",
    "byFee": true,
    "plan" : data.Plan,
]