//class saleWebViewController: UIViewController, UIWebViewDelegate
@IBOutlet weak var spinner: UIActivityIndicatorView!

//網頁開始Load
func webViewDidStartLoad(webView: UIWebView) {
        spinner.startAnimating()  //開始轉
}
    
//網頁Load好了    
func webViewDidFinishLoad(webView: UIWebView) {
        spinner.stopAnimating() //停
}