How to build an Offline screen in iOS WebView apps

  • iOS
  • June 5, 2018
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  • How to build an Offline screen in iOS WebView apps

Of course, it would be great if your iOS app users would always have a 100% working WiFi or Cellular connection. But reality is different and we should know how to handle it 😉 So let’s make the best out of it and present a nice Offline screen for these annoying situations of being offline:

 

Step 1: Design a sad smiley or something similar 😉

Step 2: Open your main storyboard in Xcode/Interface Builder and insert the image using UIImageView; call it offlineImageView.

Step 3: Create a UILabel saying something like “Please check your internet connection” and call it lblText1.

Step 4: The user should be able to retry without reloading the whole app (which would require killing it from the multitasking switcher). That’s why we add a “Try again” UIButton now – let’s call it btnTry.

Step 5: Make sure to hide all created elements of step 2 to 4 at the beginning of your app launch and after every successful loading of WebView pages:

webView.isHidden = false

offlineImageView.isHidden = true

lblText1.isHidden = true

btnTry.isHidden = true

Step 6: When your WebView loads any URL, check the mobile connection of the user and catch connection errors:

func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error)

{

if((error as NSError).code == NSURLErrorNotConnectedToInternet)

{

if(!isFirstTimeLoad)

{

let alertController = UIAlertController(title: offlinetitle, message: offlinemsg, preferredStyle: UIAlertControllerStyle.alert)

let okAction = UIAlertAction(title: okbutton, style: UIAlertActionStyle.cancel, handler: {

(action : UIAlertAction!) -> Void in

})

alertController.addAction(okAction)

self.present(alertController, animated: true, completion: nil)

}

isFirstTimeLoad = false

webView.isHidden = true

offlineImageView.isHidden = false

lblText1.isHidden = false

btnTry.isHidden = false

}

    }

 

If you use the WebViewGold Xcode template (or WeSetupYourWebViewApp service), you do not need to worry about the whole Offline screen creating process. It just looks great:

Any questions? Just email us! 🙂