如何在Swift中为post请求准备JSON？

import Foundation

let postData: [String: Any] = [
    "key1": "value1",
    "key2": "value2"
]

do {
    let jsonData = try JSONSerialization.data(withJSONObject: postData, options: [])
    // jsonData即为准备好的JSON数据
} catch {
    print("JSON转换失败: \(error)")
}

let url = URL(string: "https://example.com/api")!
var request = URLRequest(url: url)
request.httpMethod = "POST"

request.setValue("application/json", forHTTPHeaderField: "Content-Type")

request.httpBody = jsonData

let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
    if let error = error {
        print("请求失败: \(error)")
        return
    }
    
    if let data = data {
        // 处理响应数据
        do {
            let json = try JSONSerialization.jsonObject(with: data, options: [])
            print("响应数据: \(json)")
        } catch {
            print("响应数据解析失败: \(error)")
        }
    }
}
task.resume()