Reload UIWebView with UIButton when both are implemented programmatically (Swift)

Question

I have a UIWebView that loads a embed SoundCloud track. I copied the code from the website, created a html file, and included it inside of the Xcode project. It loads perfectly fine; however, I want the user to be able to reload the WebView since the UIWebView is very small and it does not have any navigation buttons. It simply displays SoundCloud embed widget.

Is there a way to achieve this without using the Interface Builder? The app crashes when the button is tapped.

I have implemented the UIWebView and UIButton onto the screen programmatically because the size and coordinates of each will be different depending on the size of the iPhone screen.

The UIWebView is set to nil before the viewDidLoad function so it can be accessed in other functions (like the reload function).

class SecondViewController: UIViewController, UIWebViewDelegate {

    let WebView: UIWebView! = nil
    override  func viewDidLoad() {
        super.viewDidLoad()

        let WebViewDetails = getCoordAndSize("WEBV") // stores 4 values into one variable. its a tuple
        let WebView = UIWebView(frame: CGRectMake(WebViewDetails.0, WebViewDetails.1, WebViewDetails.2, WebViewDetails.3))

        //load local html file
        let localfilePath = NSBundle.mainBundle().URLForResource("sctrack", withExtension: "html")
        let myRequest = NSURLRequest(URL: localfilePath!)
        WebView.loadRequest(myRequest)
        WebView.delegate = self

        let refreshButton = UIButton()
        refreshButton.setTitle("Refresh", forState: .Normal)
        refreshButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
        refreshButton.backgroundColor = UIColor.clearColor()
        refreshButton.layer.cornerRadius = 5
        refreshButton.layer.borderWidth = 1
        refreshButton.layer.borderColor = UIColor.whiteColor().CGColor
        refreshButton.frame = CGRectMake((self.view.frame.size.width - 240) / 2, (imageViewDetails.2 - 40),240,40)


        //(LOOK HERE) BUTTON ACTION . What I want it to do is to reload html file when user taps on it
        refreshButton.addTarget(self, action: #selector(reload), forControlEvents: .TouchUpInside)
        self.view.addSubview(refreshButton)
    }

Below is the function for the refreshButton. When the user taps the button, it calls the reload function. I want it to reload the local file. I added the comment saying "ERROR HERE" to

    func reload(sender: UIButton!) {
        //ERROR HERE
        WebView.reload()

        let alertView = UIAlertController(title: "Message", message: "Track refreshed! Enjoy 🤘🏾✨", preferredStyle: .Alert)
        // Initialize Actions
        let okAction = UIAlertAction(title: "Ok", style: .Default) { (action) -> Void in
        }
        alertView.addAction(okAction)
        self.presentViewController(alertView, animated: true, completion: nil)
    }
}

I've tried to include the html request inside of reload function and used WebView.loadRequest(myRequest) instead of WebView.reload, but the app still crashes.

Santosh · Accepted Answer · 2016-06-24 02:49:04Z

1

You are not initializing WebView which you have declared at class level. And again in viewDidLoad you are creating another variable with same name

      let WebView = UIWebView(frame: CGRectMake(WebViewDetails.0, WebViewDetails.1, WebViewDetails.2, WebViewDetails.3))

So your WebView used in reload method never initialized and hence the error/crash.

Remove let keyword in viewDidLoad for WebView. Everything will work fine.

answered Jun 24, 2016 at 2:49

Santosh

2,9141 gold badge19 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

codeherk Over a year ago

Thanks a lot @Santosh!. I removed let from the class level and from viewDidLoad and it works! It's amazing how two words can crash an app.

Collectives™ on Stack Overflow

Reload UIWebView with UIButton when both are implemented programmatically (Swift)

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related