为什么我的json编码对象在Swift中为nil

我的swift代码与Jameson Quave在这个网站上找到的代码很接近。

在串行中，如果我打印ln（json），则值为零。然而，如果我打印ln（数据），我会得到数字。如果我println("Body: '(strData)")，我得到以下内容。如有任何帮助，我们将不胜感激。

以下是示例数据：

Body: Optional([
{
    "LocAddress": "2045 Broadway ",
    "City": "New York",
    "Region": "New York",
    "Country": "United States"
},
{
    "LocAddress": "6916 4th Ave",
    "City": "New York",
    "Region": "New York",
    "Country": "United States"
},
{
    "LocAddress": "Bleaker St.",
    "City": "New York",
    "Region": "New York",
    "Country": "United States"
},
{
    "LocAddress": "37-45 87th St",
    "City": "New York",
    "Region": "New York",
    "Country": "United States"
},
{
    "LocAddress": "88-35 249th St",
    "City": "New York",
    "Region": "New York",
    "Country": "United States"
},
{
    "LocAddress": "225 West 79th",
    "City": "New York",
    "Region": "New York",
    "Country": "United States"
}

])

如果有人问我这个问题，我深表歉意。我是stackoverflow的常客，在发布这个问题之前，我尽了最大努力寻找答案。