I mean that if you are building this as a Cordova app, you should use a plugin that enables WKWebView instead of the built in UIWebView. It solves this problem, among others. You can find such a plugin here: https://github.com/ionic-team/cordova-plugin-ionic-webview
Please note that there are a couple of integration issues which I discuss here (among other places): http://forum.quasar-framework.org/topic/93/custom-webview-for-ios-devices/7
BUT given the above, (and if you are building for Cordova) it is TOTALLY worth it, because the performance blows the default UIWebview out of the water.