 {
     private weak var controller:CHome!
     private let kBackgroundHeight:CGFloat = 50
+    private let kButtonBackWidth:CGFloat = 60
     
     convenience init(controller:CHome)
     {

        buttonBack.imageView!.contentMode = UIViewContentMode.center
        buttonBack.imageView!.clipsToBounds = true
        buttonBack.imageView!.tintColor = UIColor(white:1, alpha:0.2)
        
        background.addSubview(buttonBack)
        addSubview(background)

            layoutButtonBackTop,
            layoutButtonBackBottom,
            layoutButtonBackLeft,
            layoutButtonBackWidth])
    }
    
    //MARK: actions
    
    func actionBack(sender button:UIButton)
    {
        
    }
}
