Make sure that your config.xml whitelist is ok
<allow-navigation href="http://*" />
<allow-intent href="http://*/*" />
Those tags must be set. Specify your url to restrict the navigation.
cordova cleanand then
cordova build ios
Make sure that you have a provisioning profile when building otherwise the app will be stuck after the splash screen.
It's preferable to build on xcode AFTER runnin "cordova build ios" since cordova will reparse your main xml. Avoid the modification of the xml for the specific platform and remember to backup your files before doing anything.