在Swift中，你可以使用JSONSerialization类将JSON字符串转换为字典。要将 Swift 字典转换为 JSON 字符串，我们可以使用JSONSerialization类的data(withJSONObject:options:)方法。这个方法将字典转换为二进制数据，然后我们可以使用String(data:encoding:)方法将其转换为字符串形式。

JSON字符串转换为字典

以下是一个例子：

// jsonStr 转为Dict
func jsonToDict() {print("json转为Dict")// 假设你有一个JSON字符串let jsonString = """{"name": "John Doe","age": 30,"isDeveloper": true}"""let jsonData = jsonString.data(using: .utf8)let dictData = try? JSONSerialization.jsonObject(with: jsonData!, options: []) as? [String: Any]print("dict data keys is:\(dictData?.keys)")print("dict data values is:\(dictData?.values)")
}

JSON字符串转换为数组

示例代码：

// jsonStr 转为Array
func jsonToArray() {print("jsonString转为数组")let jsonStr = """[1,2,3,4,5]"""let jsonData = jsonStr.data(using: .utf8)let arrayData = try? JSONSerialization.jsonObject(with: jsonData!, options: []) as? [Int]print("arrayData value is:\(arrayData)")
}

字典转为Json字符串

示例代码：

// Dict转为JsonStr
func dictToJson() {print("dict转为Json字符串")// 将字典转为JSON字符串let dictData = ["name": "王思聪", "city": "New York", "age": 18] as [String: Any]guard let jsonData = try? JSONSerialization.data(withJSONObject: dictData, options: []) else { return }let jsonString = String(data: jsonData, encoding: .utf8)print("dict转为jsonString:\(jsonString)")
}

数组转为Json字符串

示例代码：

// array转为jsonStr
func arrayToJson() {print("array转为Json字符串")let arrayData = ["name", "王思聪", "city", "New York", "age"]guard let jsonData = try? JSONSerialization.data(withJSONObject: arrayData, options: []) else { return }let jsonString = String(data: jsonData, encoding: .utf8)print("array转为jsonString:\(jsonString)")
}

全部的代码和效果如下：

import SwiftUIfunc getFood() -> String {return ["🍏", "🍎", "🍐", "🍊", "🍌", "🍋", "🍉", "🍇", "🍓", "🫐"].randomElement()!
}// json 反序列化
func jsonDecode() {print("json 数据解码")struct Person: Codable {let name: Stringlet age: Intlet email: String}let jsonStr = """{"name": "John","age": 30,"email": "john@example.com"}"""// 将json字符串转换为Datalet jsonData = jsonStr.data(using: .utf8)// JSONDecoderlet decoder = JSONDecoder()// 使用decoder将Data转为结构体let per1 = try! decoder.decode(Person.self, from: jsonData!)print("person name: \(per1.name)")print("person age: \(per1.age)")print("persn email: \(per1.email)")
}// json 序列化
func jsonToStr() {print("json 转为字符串")struct Person: Codable {let name: Stringlet age: Intlet email: String}// 创建结构体实例let per2 = Person(name: "EmployA", age: 18, email: "john@example.com")// 创建jsonEncoderlet jsonEncoder = JSONEncoder()// 将结构体实例per2转为Datalet jsonData = try? jsonEncoder.encode(per2)print("jsonData: \(String(describing: jsonData))")// 将data转为Stringlet jsonString = String(data: jsonData!, encoding: .utf8)!print("jsonString: \(jsonString)")
}// jsonStr 转为Dict
func jsonToDict() {print("json转为Dict")// 假设你有一个JSON字符串let jsonString = """{"name": "John Doe","age": 30,"isDeveloper": true}"""let jsonData = jsonString.data(using: .utf8)let dictData = try? JSONSerialization.jsonObject(with: jsonData!, options: []) as? [String: Any]print("dict data keys is:\(dictData?.keys)")print("dict data values is:\(dictData?.values)")
}// jsonStr 转为Array
func jsonToArray() {print("jsonString转为数组")let jsonStr = """[1,2,3,4,5]"""let jsonData = jsonStr.data(using: .utf8)let arrayData = try? JSONSerialization.jsonObject(with: jsonData!, options: []) as? [Int]print("arrayData value is:\(arrayData)")
}// Dict转为JsonStr
func dictToJson() {print("dict转为Json字符串")// 将字典转为JSON字符串let dictData = ["name": "王思聪", "city": "New York", "age": 18] as [String: Any]guard let jsonData = try? JSONSerialization.data(withJSONObject: dictData, options: []) else { return }let jsonString = String(data: jsonData, encoding: .utf8)print("dict转为jsonString:\(jsonString)")
}// array转为jsonStr
func arrayToJson() {print("array转为Json字符串")let arrayData = ["name", "王思聪", "city", "New York", "age"]guard let jsonData = try? JSONSerialization.data(withJSONObject: arrayData, options: []) else { return }let jsonString = String(data: jsonData, encoding: .utf8)print("array转为jsonString:\(jsonString)")
}struct ContentView: View {@State var food = "🍏"var body: some View {VStack {Spacer()Spacer()Spacer()Text(food).font(.system(size: 80))Button(action: {food = getFood()}, label: {Text("今天吃啥？").padding().foregroundColor(.white).font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/)}).background(.orange).cornerRadius(10)Button(action: {print("解码json")jsonDecode()}, label: {Text("解码JSON").font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/).foregroundColor(.white).padding()}).background(.pink).cornerRadius(10)Button(action: {jsonToStr()}, label: {Text("编码JSON").font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/).foregroundColor(.white).padding()}).background(.blue).cornerRadius(10)Button(action: {print("json转为dict类型")jsonToDict()}, label: {Text("Json转Dict").foregroundColor(.white).padding(10).font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/)}).background(.yellow).cornerRadius(10)Button(action: {print("json转为数组")jsonToArray()}, label: {Text("Json转Array").font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/).padding(10).foregroundColor(.white)}).background(.gray).cornerRadius(10)Button(action: {print("dict数据转为json")dictToJson()}, label: {Text("Dict转为Json").foregroundColor(.white).padding(10).font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/)}).background(.green).cornerRadius(10)Button(action: {print("字典转为数组")arrayToJson()}, label: {Text("Dict转数组").font(/*@START_MENU_TOKEN@*/ .title/*@END_MENU_TOKEN@*/).foregroundColor(.white).padding(10)}).background(.purple).cornerRadius(10)Spacer()Spacer()Spacer()}}
}