Check if an URL has got http:// prefix

Question

In my application, when the user add an object, can also add a link for this object and then the link can be opened in a webView.
I tried to save a link without http://

Answer 1

I wrote an extension for String in Swift, to see if url string got http or https

extension String{

    func isValidForUrl()->Bool{

        if(self.hasPrefix("http") || self.hasPrefix("https")){
            return true
        }
        return false
    }
}

if(urlString.isValidForUrl())
    {
      //Do the thing here.
}