iOS Swift Webview show image while loading

Question

I'm loading a Web-View in my iOS App.

Is it possible to show an image while the Webview is loading in the background?

I found something for Objective-C but nothing for Swift 2.2.

How can I detect if the Web-View finished loading?

Edit:

   func webViewDidStartLoad(webView: UIWebView!) {
    loadingView.viewWithTag(1)?.hidden = false 
    print("Webview started Loading")
    }

func webViewDidFinishLoad(webView: UIWebView!) {
loadingView.viewWithTag(1)?.hidden = true 
print("Webview did finish load")
}

from: How to show image while page is loading in swift?

Answer 1

Conform to the UIWebViewDelegate protocol and set your view controller as the web view's delegate. The function webViewDidFinishLoad(_ webView: UIWebView) will be called when it has finished loading. You can set your image over the web view in the beginning then clear it in this function.

Edit:

I can't place it over the web view can I?

Yes, do exactly that. If you set the image to hidden it won't affect the user's interaction with the web view.

Answer 2

So finally its working...

Here my Solution for Swift 2.2

class YourViewController: UIViewController, UIWebViewDelegate {

    @IBOutlet weak var webView: UIWebView!

    override func viewDidLoad() {

    super.viewDidLoad()

    // For the Loading image: Create an ImageView programmatically and add id to the view
        let imageName = "YourPicture.png"
        let image = UIImage(named: imageName)
        let imageView = UIImageView(image: image!)
        imageView.tag = 1;
        imageView.frame = CGRect(x: 50, y: 250, width: 300, height: 100)
        view.addSubview(imageView)


      let url = "http://apple.com"

        let requestURL = NSURL(string:url)
        let request = NSURLRequest(URL: requestURL!)
        webView.delegate = self
        webView.loadRequest(request)        

    }

    func webViewDidFinishLoad(webView: UIWebView) {

       // UIWebView object has fully loaded.
      if(webView.stringByEvaluatingJavaScriptFromString("document.readyState") == "complete") {

        // Manually add a delay, showing the Webview takes some time..
        // For Swift 2.2
        let time = dispatch_time(dispatch_time_t(DISPATCH_TIME_NOW), 2 * Int64(NSEC_PER_SEC))

        dispatch_after(time, dispatch_get_main_queue()) {
        //put your code which should be executed with a delay here

           self.view.viewWithTag(1)?.hidden = true}
        }

        print("Webview did finish load")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}