gistfile1.txt

class Singleton {
  class var sharedInstance: Singleton {
  
  var name: String? 
  
    struct Static {
      static var instance: Singleton?
      static var token: dispatch_once_t = 0
    }

    dispatch_once(&Static.token) {
      Static.instance = Singleton()
    }

    return Static.instance!
  }
}

Swift 1.1:

class Singleton {
    class var sharedInstance: Singleton {
        get {
            struct Static {
                static let instance = Singleton(name: "sharedInstance")
            }
            return Static.instance
        }
    }

    var name: String

    init(name: String) {
        self.name = name
    }
}

---

Swift 1.2:

class Singleton {
    static let sharedInstance = Singleton(name: "sharedInstance")

    var name: String

    init(name: String) {
        self.name = name
    }
}