iOS WebView App Conversion

I already have a fully responsive website that handles log-in, forms, payments, and every core feature on an iPhone. What I need now is an iOS wrapper that presents the site through WKWebView, adds native niceties, and is ready for App Store release—without rebuilding anything from scratch... (Budget: $30 - $250 USD, Jobs: App Development, iOS, iPad, iPhone, Mobile App Development, Mobile Development, Objective C, Xcode)