如何将NSDictionary转换为包含Swift中NSDictionary的json的NSString？

Question

如何将NSDictionary转换为包含NSDictionary的JSON的NSString？我试过但没有成功

//parameters is NSDictionary

let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(data!, options:NSJSONReadingOptions.MutableContainers , error: &error) as NSDictionary

我想在swift中将这个NSDictionary Json转换为NSString

Answer 1

您可以使用以下代码:

var error: NSError?
var dict: NSDictionary = [
    "1": 1,
    "2": "Two",
    "3": false
]

let data = NSJSONSerialization.dataWithJSONObject(dict, options: NSJSONWritingOptions.PrettyPrinted, error: &error)

if let data = data {
    let json = NSString(data: data, encoding: NSUTF8StringEncoding)
    if let json = json {
        println(json)
    }
}

给定a NSDictionary,将其序列化为NSData,然后转换为NSString.

执行转换的代码也可以更简洁地重写为:

斯威夫特3:

    do {
        let jsonData = try JSONSerialization.data(withJSONObject: data)
        if let json = String(data: data, encoding: .utf8) {
            print(json)
        }
    } catch {
        print("something went wrong with parsing json")
    }

原始答案:

if let data = NSJSONSerialization.dataWithJSONObject(dict, options: NSJSONWritingOptions.PrettyPrinted, error: &error) {
    if let json = NSString(data: data, encoding: NSUTF8StringEncoding) {
        println(json)
    }
}

请注意,为了使序列化起作用,字典必须包含有效的JSON键和值.