Ios 在swift中将数组转换为JSON字符串
如何在swift中将数组转换为JSON字符串? 基本上我有一个文本字段,里面有一个按钮。 按下按钮时,文本字段文本将添加到Ios 在swift中将数组转换为JSON字符串,ios,json,string,swift,Ios,Json,String,Swift,如何在swift中将数组转换为JSON字符串? 基本上我有一个文本字段,里面有一个按钮。 按下按钮时,文本字段文本将添加到testArray。 此外,我想将此数组转换为JSON字符串 这就是我尝试过的: func addButtonPressed() { if goalsTextField.text == "" { // Do nothing } else { testArray.append(goalsTextField.text)
testArray
。
此外,我想将此数组转换为JSON字符串
这就是我尝试过的:
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)
}
var postString = ""
do {
let data = try JSONSerialization.data(withJSONObject: self.arrayNParcel, options: .prettyPrinted)
let string1:String = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
postString = "arrayData=\(string1)&user_id=\(userId)&markupSrcReport=\(markup)"
} catch {
print(error.localizedDescription)
}
request.httpBody = postString.data(using: .utf8)
struct Person: Codable {
var name: String
var pets: [Pet]
}
struct Pet: Codable {
var type: String
}
extension Person {
static func sampleData() -> [Person] {
[
Person(name: "Adam", pets: []),
Person(name: "Jane", pets: [
Pet(type: "Cat")
]),
Person(name: "Robert", pets: [
Pet(type: "Cat"),
Pet(type: "Rabbit")
])
]
}
}
JSONEncoder.encode(from: Person.sampleData())
我还想使用我的
saveToDictionary()
方法返回JSON字符串。提示:要将包含JSON兼容对象的NSArray转换为包含JSON文档的NSData对象,请使用适当的NSJSONSerialization方法。JSONObjectWithData不是它
提示2:您很少希望该数据作为字符串;仅用于调试目的 目前,您正在将其转换为数据,然后尝试将数据转换为JSON形式的对象(失败,它不是JSON)并将其转换为字符串,基本上您有一系列无意义的转换 只要数组只包含JSON可编码的值(字符串、数字、字典、数组、nil),就可以使用NSJSONSerialization来实现 相反,只需执行数组->数据->字符串部分: 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展开,但它为您提供了正确的起点。如果您已经在使用SwiftyJSON: 您可以这样做:
// this works with dictionaries too
let paramsDictionary = [
"title": "foo",
"description": "bar"
]
let paramsArray = [ "one", "two" ]
let paramsJSON = JSON(paramsArray)
let paramsString = paramsJSON.rawString(encoding: NSUTF8StringEncoding, options: nil)
SWIFT 3更新
let paramsJSON = JSON(paramsArray)
let paramsString = paramsJSON.rawString(String.Encoding.utf8, options: JSONSerialization.WritingOptions.prettyPrinted)!
有利于传输的JSON字符串不会经常出现,因为您可以对HTTP主体进行JSON编码。但是JSON stringify的一个潜在用例是多部分Post,AlamoFire现在支持它。Swift 3.0-4.0版本
do {
//Convert to Data
let jsonData = try JSONSerialization.data(withJSONObject: dictionaryOrArray, options: JSONSerialization.WritingOptions.prettyPrinted)
//Convert back to string. Usually only do this for debugging
if let JSONString = String(data: jsonData, encoding: String.Encoding.utf8) {
print(JSONString)
}
//In production, you usually want to try and cast as the root data structure. Here we are casting as a dictionary. If the root object is an array cast as [Any].
var json = try JSONSerialization.jsonObject(with: jsonData, options: JSONSerialization.ReadingOptions.mutableContainers) as? [String: Any]
} catch {
print(error.description)
}
JSONSerialization.WritingOptions.prettyPrinted
选项为最终使用者提供了一种更易于阅读的格式,如果他们要在调试器中打印出来的话
参考:
JSONSerialization.ReadingOptions.mutableContainers
选项允许您修改返回的数组和/或字典
所有阅读选项的参考:
注意:Swift 4能够使用新协议对对象进行编码和解码。这是,还有一个。SWIFT 2.0
var tempJson : NSString = ""
do {
let arrJson = try NSJSONSerialization.dataWithJSONObject(arrInvitationList, options: NSJSONWritingOptions.PrettyPrinted)
let string = NSString(data: arrJson, encoding: NSUTF8StringEncoding)
tempJson = string! as NSString
}catch let error as NSError{
print(error.description)
}
注意:-如果要使用,请使用tempJson变量。如何在swift 2.3中将数组转换为json字符串
var yourString : String = ""
do
{
if let postData : NSData = try NSJSONSerialization.dataWithJSONObject(yourArray, options: NSJSONWritingOptions.PrettyPrinted)
{
yourString = NSString(data: postData, encoding: NSUTF8StringEncoding)! as String
}
}
catch
{
print(error)
}
现在您可以将您的Sting用作JSON字符串 对于Swift 3.0,您必须使用以下命令:
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)
}
var postString = ""
do {
let data = try JSONSerialization.data(withJSONObject: self.arrayNParcel, options: .prettyPrinted)
let string1:String = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
postString = "arrayData=\(string1)&user_id=\(userId)&markupSrcReport=\(markup)"
} catch {
print(error.localizedDescription)
}
request.httpBody = postString.data(using: .utf8)
struct Person: Codable {
var name: String
var pets: [Pet]
}
struct Pet: Codable {
var type: String
}
extension Person {
static func sampleData() -> [Person] {
[
Person(name: "Adam", pets: []),
Person(name: "Jane", pets: [
Pet(type: "Cat")
]),
Person(name: "Robert", pets: [
Pet(type: "Cat"),
Pet(type: "Rabbit")
])
]
}
}
JSONEncoder.encode(from: Person.sampleData())
100%工作测试您可以试试这个
func convertToJSONString(value: AnyObject) -> String? {
if JSONSerialization.isValidJSONObject(value) {
do{
let data = try JSONSerialization.data(withJSONObject: value, options: [])
if let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
return string as String
}
}catch{
}
}
return nil
}
如果您在模型中使用可编码协议,这些扩展可能有助于获取字典表示形式(Swift 4)对于Swift 4.2,这些代码仍然可以正常工作
var mnemonic: [String] = ["abandon", "amount", "liar", "buyer"]
var myJsonString = ""
do {
let data = try JSONSerialization.data(withJSONObject:mnemonic, options: .prettyPrinted)
myJsonString = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
} catch {
print(error.localizedDescription)
}
return myJsonString
Swift 5 确保您的对象确认
Codable
Swift的默认变量类型,如Int、String、Double和…,都是Codable
,这意味着我们可以将主题转换为数据,反之亦然
例如,让我们将Int数组转换为字符串Base64
let array = [1, 2, 3]
let data = try? JSONEncoder().encode(array)
nsManagedObject.array = data?.base64EncodedString()
如果对核心数据对象使用自定义类,请确保核心数据架构编辑器和自定义类中的NSManaged
变量类型为String
让我们将base64字符串转换回数组:
var getArray: [Int] {
guard let array = array else { return [] }
guard let data = Data(base64Encoded: array) else { return [] }
guard let val = try? JSONDecoder().decode([Int].self, from: data) else { return [] }
return val
}
不要将您自己的对象转换为
Base64
并在CoreData中存储为字符串,反之亦然,因为我们在CoreData(数据库)中有一个名为关系的对象。Swift 5
此通用的扩展
将对象的数组
转换为JSON字符串
,该字符串可以是:
- 保存到应用程序的文档目录(iOS/MacOS)
- 直接输出到桌面上的文件(MacOS)
用法:
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)
}
var postString = ""
do {
let data = try JSONSerialization.data(withJSONObject: self.arrayNParcel, options: .prettyPrinted)
let string1:String = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
postString = "arrayData=\(string1)&user_id=\(userId)&markupSrcReport=\(markup)"
} catch {
print(error.localizedDescription)
}
request.httpBody = postString.data(using: .utf8)
struct Person: Codable {
var name: String
var pets: [Pet]
}
struct Pet: Codable {
var type: String
}
extension Person {
static func sampleData() -> [Person] {
[
Person(name: "Adam", pets: []),
Person(name: "Jane", pets: [
Pet(type: "Cat")
]),
Person(name: "Robert", pets: [
Pet(type: "Cat"),
Pet(type: "Rabbit")
])
]
}
}
JSONEncoder.encode(from: Person.sampleData())
输出:
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)
}
var postString = ""
do {
let data = try JSONSerialization.data(withJSONObject: self.arrayNParcel, options: .prettyPrinted)
let string1:String = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
postString = "arrayData=\(string1)&user_id=\(userId)&markupSrcReport=\(markup)"
} catch {
print(error.localizedDescription)
}
request.httpBody = postString.data(using: .utf8)
struct Person: Codable {
var name: String
var pets: [Pet]
}
struct Pet: Codable {
var type: String
}
extension Person {
static func sampleData() -> [Person] {
[
Person(name: "Adam", pets: []),
Person(name: "Jane", pets: [
Pet(type: "Cat")
]),
Person(name: "Robert", pets: [
Pet(type: "Cat"),
Pet(type: "Rabbit")
])
]
}
}
JSONEncoder.encode(from: Person.sampleData())
这将创建以下格式正确的Output.json
文件:
[
{
"name" : "Adam",
"pets" : [
]
},
{
"name" : "Jane",
"pets" : [
{
"type" : "Cat"
}
]
},
{
"name" : "Robert",
"pets" : [
{
"type" : "Cat"
},
{
"type" : "Rabbit"
}
]
}
]
我试图先将“testArray”转换为NSData格式,然后再转换为json。感谢您的响应WiftyJSON是一个比在Swift中处理NSString更优雅/快捷的解决方案。但我建议使用if let str=json.rawString()…
来检测是否出现了问题,并返回nil。使用上面的swiftyjson片段,我得到了“[\'one\”,\'two\”]”
,我现在如何将其返回到原始字符串数组?感谢您不能让Swift推断某些参数的类型–例如让jsonData=尝试JSONSerialization.data(使用JSONObject:DictionaryArray,选项:。预打印)
–字符串(数据:jsonData,编码:.utf8)
。另外,如果您要强制转换到本机Swift集合,则不需要使用.mutableContainers
选项。使用上面的代码片段,我得到了“[\'one\',\'two\']””
,现在如何将其转换回字符串数组?thanks@sweepez我认为您看到的只是调试器的一个工件。它当然可以工作,但为什么要注释String
,而初始化NSString
,并强制转换为String
<代码>让string1=String(数据:数据,编码:.utf8)代码>已足够。在Swift中根本不要使用NSString
。需要单独转换数组,这就是为什么相信我,不需要使用NSString
。始终使用本机Swift字符串
。这种转变是毫无疑问的。