如何使用字典从JSON对象中提取值[Swift 4]

import Foundation

// 定义一个JSON对象
let json = """
{
    "name": "John",
    "age": 30,
    "email": "john@example.com"
}
"""

// 将JSON字符串转换为Data类型
guard let jsonData = json.data(using: .utf8) else {
    print("Invalid JSON data")
    return
}

do {
    // 将Data类型解析为字典
    if let dictionary = try JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any] {
        // 从字典中提取值
        if let name = dictionary["name"] as? String {
            print("Name: \(name)")
        }
        
        if let age = dictionary["age"] as? Int {
            print("Age: \(age)")
        }
        
        if let email = dictionary["email"] as? String {
            print("Email: \(email)")
        }
    }
} catch {
    print("JSON serialization error: \(error.localizedDescription)")
}