如何将Raw字典转换为JSON字符串

Question

我有这种类型的字典：

{
“event”: {
“type”: “message_create”, “message_create”: {
“target”: {
“recipient_id”: “RECIPIENT_USER_ID”
}, “message_data”: {
“text”: “Hello World!”,
}
}
}

我想把这本字典转换成JSON字符串格式，但无法做到。请有人指导我。

这是我在发送消息后尝试的代码，我从服务器收到了错误的身份验证数据消息-

func sendMessage(_ userInfo: String) {
let requestURL = URL(string: "https://api.twitter.com/1.1/direct_messages/events/new.json")
Alamofire.request(requestURL!, method: .post,
encoding: URLEncoding.default,
headers: getRequestHeader()).responseJSON { (response) in
print(response)
switch response.result {
case .success:
print("Validation Successful")
case .failure(let error):
print("FAILURE ERROR : (error.localizedDescription)")
print("ERROR : (error)")
if let data = response.data {
print("Print Server Error: " + String(data: data, encoding: String.Encoding.utf8)!)
}
}
}
}
// MARK: - Get Request Header
func getRequestHeader() -> ([String: String]) {
return ["authorization": "","CONSUMER_KEY":"",
"CONSUMER_SECRET":"",
"oauth_secret":"7W2Gx4KEjz7d164NPvJaOktzhaSPpV3VNjvyjpIqaDc02",
"oauth_token":"2605063830-IffuOmn2tEajFXY6khbzmeMwNoUvGkQ8qrYonzw",
"oauth_version":"1.0",
"oauth_signature_method":"HMAC-SHA1",
"Content-Type": "application/json"
]
}

Answer 1

为了专注于获取json字符串(而不关心您是如何获得字典的(，我假设您的myDict是要转换为json字符串的字典：

let json = """
{
"event": {
"type": "message_create", "message_create": {
"target": {
"recipient_id": "RECIPIENT_USER_ID"
},
"message_data": {
"text": "Hello World!"
}
}
}
}
""".data(using: .utf8)
var myDict: [String: Any] = [: ]
do {
if let dict = try JSONSerialization.jsonObject(with: json!, options: []) as? [String: Any] {
myDict = dict
}
} catch {
print(error)
}

因此，现在我们想将myDict转换为json字符串：

do {
// converting `myDict` to Json Data, and then
// getting our json as string from the `jsonData`:
if let jsonData = try JSONSerialization.data(withJSONObject: myDict, options: []) as? Data,
let jsonString = String(data: jsonData, encoding: .utf8) {
print(jsonString)
}
} catch {
print(error)
}

jsonString现在就是你要找的！你应该在日志上看到：

｛"event"：｛"type"："message_create"，"message_ccreate"：{"target"：｛世界"｛｝｝

这是一个非常有效的json。

Answer 2

public extension NSDictionary{
public func toJSONString() -> String{
if JSONSerialization.isValidJSONObject(self) {
do{
let data = try JSONSerialization.data(withJSONObject: self, options: JSONSerialization.WritingOptions(rawValue: 0))
if let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
return string as String
}
}catch {
print("error")
}
}
return ""
}
}