在Jift中将JSON转换为NSData,将NSData转换为JSON

时间:2014-11-10 09:42:44

标签: json xcode swift nsdata

我在将JSON元素转换为NSData时遇到了问题,并且NSData变量在Swift中转换回JSON

首先,我想提取以下JSON数据的encryptedData元素:

{
    "transactionID" : 12345,
    "encryptedData" : [-67,51,-38,61,-72,102,48]
}

进入NSData encryptedData变量,但似乎无法做到。我使用SwiftyJSON解析JSON,如下所示:

let list: Array<JSON> = json["encryptedData"].arrayValue!

但是这给了我一个ScalarNumber数组,我不知道如何存储到NSData对象中。

其次,我想从同一个JSON对象生成NSData

let jsonObject = [
    "transactionID" : 12345,
    "encryptedData" : encryptedData
]

但是NSData encryptedData对象没有被转换为[-67,51,-38,61,-72,102,48],它似乎只是使JSON字符串无效。

有什么想法吗?

7 个答案:

答案 0 :(得分:21)

以下是在swift 2.0中转换JSON和NSData的代码(改编自Shuo的回答)

// Convert from NSData to json object
func nsdataToJSON(data: NSData) -> AnyObject? {
    do {
        return try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil
}

// Convert from JSON to nsdata
func jsonToNSData(json: AnyObject) -> NSData?{
    do {
        return try NSJSONSerialization.dataWithJSONObject(json, options: NSJSONWritingOptions.PrettyPrinted)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil;
}

答案 1 :(得分:18)

在SwiftyJSON中,您可以使用rawData方法获取NSData:

if let encryptedData:NSData = json["encryptedData"].rawData() {
    NSLog(NSString(data: encryptedData, encoding: NSUTF8StringEncoding)!)
}

要生成JSON,您应该将数据转换为数组对象:

if let encryptedDataArray = JSON(data: encryptedData).arrayObject {
    let jsonObject:JSON = [
        "transactionID" : 12345,
        "encryptedData" : encryptedDataArray
    ]
    NSLog(NSString(data: jsonObject.rawData()!, encoding: NSUTF8StringEncoding)!)
}

答案 2 :(得分:12)

我对SwiftyJSON一无所知。我使用以下代码片段在json和nsdata

之间进行转换
// Convert from NSData to json object
public class func nsdataToJSON(data: NSData) -> AnyObject? {
    return NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: nil)
}

// Convert from JSON to nsdata
public class func jsonToNSData(json: AnyObject) -> NSData?{
    return NSJSONSerialization.dataWithJSONObject(json, options: .allZeros, error: nil)
}

答案 3 :(得分:7)

@Sunil Targe这里是Swift3版本。希望这可以帮助。 (改编自Ciprian Rarau的回答)

将数据转换为JSON

func dataToJSON(data: Data) -> Any? {
   do {
       return try JSONSerialization.jsonObject(with: data, options: .mutableContainers)
   } catch let myJSONError {
       print(myJSONError)
   }
   return nil
}

从JSON转换为数据

func jsonToData(json: Any) -> Data? {
    do {
        return try JSONSerialization.data(withJSONObject: json, options: JSONSerialization.WritingOptions.prettyPrinted)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil;
}

答案 4 :(得分:3)

Swift 4对我有用:

// Convert from JSON to nsdata
func jsonToNSData(json: AnyObject) -> NSData?{
    do {
        return try JSONSerialization.data(withJSONObject: json, options: JSONSerialization.WritingOptions.prettyPrinted) as NSData
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil;
}

答案 5 :(得分:2)

class ViewController: UIViewController {

    let requestURL : NSURL = NSURL(string: "http://www.learnswiftonline.com/Samples/subway.json")!
    let session = URLSession.shared

    override func viewDidLoad() {
        super.viewDidLoad()

        fetchData()
    }

    func fetchData()
    {
        let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
        let task = session.dataTask(with: urlRequest as URLRequest) { (data, response, error) -> Void in

            let httpResponse = response as! HTTPURLResponse
            let statusCode = httpResponse.statusCode

            if(statusCode == 200)
            {
                do {
                    let jsonResponse = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers)
                    print(jsonResponse as! NSDictionary)
                }
                catch let error
                {
                    print(error)
                }
            }
        }
        task.resume()

    }
}

答案 6 :(得分:1)

<块引用>

Swift 5 和 SwiftyJSON 对我有用:

import SwiftyJSON

func getDataFrom(JSON json: JSON) -> Data? {
    do {
        return try json.rawData(options: .prettyPrinted)
    } catch _ {
        return nil
    }
}

func getJSONFrom(Data data: Data) -> JSON? {
    do {
        return try JSON(data: data, options: .mutableContainers)
    } catch _ {
        return nil
    }
    
}