在swift中将数组转换为JSON字符串

问题描述：

如何在swift中将数组转换为 JSON 字符串？
基本上我有一个嵌入按钮的文本字段。
按下按钮时，文本字段文本被添加到 testArray 。
此外，我想将此数组转换为 JSON 字符串。

How do you convert an array to a JSON string in swift? Basically I have a textfield with a button embedded in it. When button is pressed, the textfield text is added unto the testArray. Furthermore, I want to convert this array to a JSON string.

这是我尝试过的：

func addButtonPressed() {
    if goalsTextField.text == "" {
        // Do nothing
    } else {
        testArray.append(goalsTextField.text)
        goalsTableView.reloadData()
        saveDatatoDictionary()
    }
}

func saveDatatoDictionary() {
    data = NSKeyedArchiver.archivedDataWithRootObject(testArray)
    newData = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions(), error: nil) as? NSData
    string = NSString(data: newData!, encoding: NSUTF8StringEncoding) 
    println(string)
}

我还想使用 savetoDictionart（）方法返回 JSON 字符串。

I would also like to return the JSON string using my savetoDictionart() method.

答

因为它正在将它转换为数据，然后尝试将数据转换为对象作为JSON（失败，它不是JSON）并将其转换为字符串，基本上你有一堆无意义的转换。

As it stands you're converting it to data, then attempting to convert the data to to an object as JSON (which fails, it's not JSON) and converting that to a string, basically you have a bunch of meaningless transformations.

只要数组只包含JSON可编码值（字符串，数字，字典， array，nil）你可以使用NSJSONSerialization来完成它。

As long as the array contains only JSON encodable values (string, number, dictionary, array, nil) you can just use NSJSONSerialization to do it.

而只是做数组 - >数据 - >字符串部分：

Instead just do the array->data->string parts:

Swift 3/4

let array = [ "one", "two" ]

func json(from object:Any) -> String? {
    guard let data = try? JSONSerialization.data(withJSONObject: object, options: []) else {
        return nil
    }
    return String(data: data, encoding: String.Encoding.utf8)
}

print("\(json(from:array as Any))")

原始答案

let array = [ "one", "two" ]
let data = NSJSONSerialization.dataWithJSONObject(array, options: nil, error: nil)
let string = NSString(data: data!, encoding: NSUTF8StringEncoding)

虽然您可能不应该使用强制解包，但它会为您提供正确的起点。

although you should probably not use forced unwrapping, it gives you the right starting point.

在swift中将数组转换为JSON字符串

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