    static let defaultHeight:CGFloat = 60.0
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupActivityIndicator()
    }
    
    override init(frame aRect: CGRect) {
        super.init(frame: aRect)
        setupActivityIndicator()
    }
    
    override func layoutSubviews() {