Swift - webview에 로딩 만들기(activity indicator)

 
import UIKit
 
class ViewController: UIViewController, UIWebViewDelegate {
 
 
    @IBOutlet weak var webView: UIWebView!
    @IBOutlet weak var activityindicator: UIActivityIndicatorView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        activityindicator.hidden = true
        
        
        var url = NSURL(string: "https://www.google.com")
        
        var request = NSURLRequest(URL: url!)
        webView.loadRequest(request)
        
        
    
    }
 
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
 
    func webViewDidStartLoad(webView: UIWebView) {
        activityindicator.hidden = false
        activityindicator.startAnimating()
    }
    
    func webViewDidFinishLoad(webView: UIWebView) {
        activityindicator.hidden = true
        activityindicator.stopAnimating()
    }
}