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[英]How to convert object array into Json array or Json string in ios swift?
[英]How to convert JSON String to JSON Object in swift?
我尝试生成JSON对象并将其转换为JSON String,并且该进程已成功放置。 但是当我尝试将JSON String转换为JSON对象时,我的真正问题就出现了。 当我尝试时,我得到的结果为零。
func generateJSONObject() {
let jsonObject = createJSONObject(firstName: firstName[0], middleName: middleName[0], lastName: lastName[0], age: age[0], weight: weight[0])
print("jsonObject : \(jsonObject)")
let jsonString = jsonObject.description // convert It to JSON String
print("jsonString : \(jsonString)")
let jsonObjectFromString = convertToDictionary(text: jsonString)
print("jsonObjectFromString : \(String(describing: jsonObjectFromString))")
}
// JSON Object creation
func createJSONObject(firstName: String, middleName: String, lastName: String, age: Int, weight: Int) -> [String: Any] {
let jsonObject: [String: Any] = [
"user1": [
"first_name": firstName,
"middle_name": middleName,
"last_name": lastName,
"age": age,
"weight": weight
]
]
return jsonObject
}
func convertToDictionary(text: String) -> [String: Any]? {
if let data = text.data(using: .utf8) {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
} catch {
print(error.localizedDescription)
}
}
return nil
}
JSON
对象时,我得到了 jsonObject:[“user1”:[“age”:21,“middle_name”:“Lazar”,“last_name”:“V”,“weight”:67,“first_name”:“Alwin”]]
当我打印JSON
字符串时,我得到了
jsonString:[“user1”:[“age”:21,“middle_name”:“Lazar”,“last_name”:“V”,“weight”:67,“first_name”:“Alwin”]]
将JSON
字符串转换为JSON
对象我得到以下错误
无法读取数据,因为格式不正确。
jsonObjectFromString:nil
我不知道为什么会这样。 我想将JSON
String转换为JSON
对象,我想解析JSON
。
基于讨论
import Foundation
let firstName = "Joe"
let lastName = "Doe"
let middleName = "Mc."
let age = 100
let weight = 45
let jsonObject: [String: [String:Any]] = [
"user1": [
"first_name": firstName,
"middle_name": middleName,
"last_name": lastName,
"age": age,
"weight": weight
]
]
if let data = try? JSONSerialization.data(withJSONObject: jsonObject, options: .prettyPrinted),
let str = String(data: data, encoding: .utf8) {
print(str)
}
版画
{
"user1" : {
"age" : 100,
"middle_name" : "Mc.",
"last_name" : "Doe",
"weight" : 45,
"first_name" : "Joe"
}
}
Json必须在Array或Dictionary中,它不能只是字符串所以要创建一个jsonstring首先需要转换为Data格式然后转换为String
func generateJSONObject() {
let jsonObject = createJSONObject(firstName: "firstName", middleName: "middleName", lastName: "lastName", age: 21, weight: 82)
print("jsonObject : \(jsonObject)")
if let jsonString = convertToJsonString(json: jsonObject), let jsonObjectFromString = convertToDictionary(text: jsonString) {
print("jsonObjectFromString : \(jsonObjectFromString)")
}
}
func convertToJsonString(json: [String: Any]) -> String? {
do {
let jsonData = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
return String(data: jsonData, encoding: .utf8)
} catch {
print(error.localizedDescription)
}
return nil
}
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