Singleton

Singleton.swift

import Foundation

class SingletonC : NSObject {
    
    class var sharedInstance : SingletonC {
        struct Static {
            static var onceToken : dispatch_once_t = 0
            static var instance : SingletonC? = nil
        }
        dispatch_once(&Static.onceToken) {
            Static.instance = SingletonC()
        }
        return Static.instance!
    }
    
    init() {
        println("CCC");
    }
    
}