let bannerView = CFBannerView(frame:frame)
bannerView.dataSource = self
bannerView.delegate = self
bannerView.reloadData()
        
extension ViewController:CFBannerViewDataSource,CFBannerViewDelegate{
    func numberOfItems() -> Int {
        return banners.count
    }
    
    func viewForItem(bannerView: CFBannerView, index: Int) -> UIView {
        let imageView = UIImageView(frame: bannerView.bounds)
        imageView.sd_setImage(with: URL(string: banners[index]), placeholderImage: UIImage(named: "default"))
 
        return imageView
    }
    
    func didSelectItem(index: Int) {
        print(index)
    }
}