WKWebView - Restricting domain

I'm trying to include an online form in my application using a webview, and I notice that the once the user finishes the form, s/he can navigate to different addresses. Is there any way I can restrict the domain/url access of a webkit? (This used to be possible using UIWebView example: http://stackoverflow.com/questions/7673116/restrict-uiwebview-to-certain-pages but it's now depricated)