arrays - Swift:从 JSON 中解析数组

Question

[{"name":"Air Elemental","toughness":"4","printings":["LEA","BTD","7ED","8ED","9ED","10E","DD2","M10","DPA","ME4","DD3_JVC"]}]

我有一个 JSON，其中每个列表中有一个名为“printings”的数组，如下所示，我如何从每个列表中取出这个数组并将其转换为“LEA-BTD-7ED”之类的字符串。这是我到目前为止所拥有的，但它崩溃了。

let err : NSErrorPointer?
    let dataPath = NSBundle.mainBundle().pathForResource("cardata", ofType: "json")
    let data : NSData = try! NSData(contentsOfFile: dataPath! as String, options: NSDataReadingOptions.DataReadingMapped)
    do{
        var contents = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments) as! [AnyObject]

        for var i = 0;i<contents.count;++i{

                let printing = contents[i]["printings"] as! String
                 }
        } 

Answer 1

代码如下:

let path = dataPath!
if let JSONData = NSData(contentsOfFile: path)
{
    do
    {
        if let dictionariesArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: NSJSONReadingOptions()) as?
            [[String: AnyObject]]
        {
            for dictionary in dictionariesArray
            {
                if let printingsArray = dictionary["printings"] as? [String]
                {
                    let printingsString = printingsArray.joinWithSeparator("-")
                    print(printingsString)
                }
            }
        }

    }
    catch
    {
        print("Could not parse file at \(path)")
    }
}

执行它会打印“LEA-BTD-7ED-8ED-9ED-10E-DD2-M10-DPA-ME4-DD3_JVC”