从JSON字符串中的2D数组中检索值 [英] Retrieving values from 2D array in JSON string

问题描述

我们使用这样的REST协议获取一些JSON数据.

We fetch some JSON data using a REST protocol like this.

jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)

看起来像这样:

jsonResult: (
    {
    board = "[[\"1:\",\"Y\",\"U\",\"P\"]]";
})

由此，我们得到一个像这样的游戏板:

From this we get a game board like so:

     if let boardContentArray = jsonResult[0]["board"] as NSArray?{
        print("boardContentArray: \(boardContentArray)" )
    } else {
        print("board element is not an NSArray")
    }

boardContentArray看起来像这样:现在我应该是一个只有一行四列的2D数组，但是它应该适用于任何给定的大小.

The boardContentArray looks like this: It i supposed to be a 2D array with only one row and four columns at the moment, but it should should work for any given size.

[["1:","Y","U","P"]]

如何检索boardFromRemote的各个值.我想像这样将2D数组中的元素设置为0,0:

How can you retrieve the individual values of boardFromRemote. I imagine to get the element at 0,0 in the 2D array some way like this:

boardContentArray[0][0]

然后应返回"1:" ，事实并非如此.此确切的语法不正确，无法编译.从boardContentArray变量检索元素的正确方法是什么?

This should then return "1:", which is not the case. This exact syntax is incorrect and won't compile. What is the correct way to retrieve an element from the boardContentArray variable?

推荐答案

jsonResult[0]["board"]的内容是 JSON字符串，可以使用NSJSONSerialization解码为数组.您必须首先将String转换为NSData，然后像这样将其解码:

The content of jsonResult[0]["board"] is a JSON String which can be decoded as an array with NSJSONSerialization. You have to first transform the String to NSData, then decode it like this for example:

do {
    let boardContentArray = "[[\"1:\",\"Y\",\"U\",\"P\"]]" // the String from jsonResult[0]["board"]
    if let boardData = boardContentArray.dataUsingEncoding(NSUTF8StringEncoding),
        let boardArray = try NSJSONSerialization.JSONObjectWithData(boardData, options: []) as? [[String]] {
            print(boardArray[0]) // ["1:", "Y", "U", "P"]
    }
} catch let error as NSError {
    print(error)
}

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