Swift 2.2 单例

Question

我是 Swift 的新手。我正在尝试从 Web 服务解析一些 JSON 数据并想要一个单例用户类。但我被困在创建单例中。这是我的代码:

import Foundation
class User {
   private var success: String
   private var userId: String
   private var name: String
   private var gender: String
   private var email: String
   private var userObject = [User]()

    class  var sharedInstane:User {
        struct Singleton {
            static var onceToken: dispatch_once_t = 0
            static var instance:User? = nil
        }
        dispatch_once(&Singleton.onceToken){
            Singleton.instance = User()
        }
        return Singleton.instance!
    }

    private init(success: String, userId: String, name: String, gender:  String, email: String)
    {
        self.success = success
        self.userId = userId
        self.name = name
        self.gender = gender
        self.email = email
    }
    convenience init(dictionary: [String:AnyObject]) {
    let success = dictionary["success"] as? String
    let userId = dictionary["userId"] as? String
    let name = dictionary["name"] as? String
    let gender = dictionary["gender"] as? String
    let email = dictionary["email"] as? String
     self.init(success: success!, userId: userId!, name: name!,  gender: gender!, email: email!, )
    }

    func callWebserviceToLoadUserInfo (url:String, param:[String:AnyObject],completeHandler:(Bool?,String) -> ())

    {
     let connection = ServerConnection()
     connection.getJSONDataForWebService(url, params: param) { (response, error) in
     // code goes here
            var responseDict = response as! [String : AnyObject]
            responseDict = responseDict["responseDict"] as! [String : AnyObject]
               if responseDict["success"] as! String == "1" {
                   for dict in responseDict {
                    let user = User(dictionary: (dict as! [String:AnyObject]))
                       self.userObject.append(user)
                }
             print("user : \(self.userObject[0].name)")
            }else{
                // error goes here
            }
        }
  }

任何人都可以帮助我如何编写这段代码吗？

Answer 1

单行示例代码中的单例。

class TheOneAndOnlyKraken {
    static let sharedInstance = TheOneAndOnlyKraken()
    private init() {} //This prevents others from using the default '()' initializer for this class.
}

For more details.