在Swift中使用单例和解析JSON

class MySingleton {
    static let shared = MySingleton()
    
    private init() {
        // 初始化代码
    }
    
    func doSomething() {
        // 单例方法
    }
}

let jsonString = """
{
    "name": "John",
    "age": 30,
    "email": "john@example.com"
}
"""

if let jsonData = jsonString.data(using: .utf8) {
    do {
        if let json = try JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any] {
            let name = json["name"] as? String
            let age = json["age"] as? Int
            let email = json["email"] as? String
            
            // 使用解析后的数据进行后续操作
        }
    } catch {
        print("JSON解析失败：\(error)")
    }
}