PhoneGap Developer App Preview for Firefox OS
hacks.mozilla.org
hacks.mozilla.org
I think I was able to get about 40% of the way there in about five hours in Cocoa, the only real stumbling block was dealing with ViewControllers and UITableViews. Unfortunately for non-native platforms, if PhoneGap is positioned as a good starter for low-barrier apps, it doesn't bode well if a developer can go in fresh and with about the same amount of effort build one platform in whole, and about 20% of another...
I haven't tested Ionic, though the Creator utility looks promising. Do you have any experience in how well Ionic interfaces with native APIs, like Twitter/Facebook on iOS and sharing on Android? And how do Ionic-built HTML apps perform in terms of speed?
Performance is fairly good. I get around 5 seconds on a 4s, and about 8 on a Nexus S, though I haven't tested with recent code on the Android Phone. The only native API I've used has so far been push notifications. While there's a plugin for that, it works as a pretty thin bridge between native code, and a couple of dispatch functions that use stringByEvaluatingJavaScriptFromString. I've had to fix things, so it means having to understand Cocoa code anyway.
There are also some visual issues with the code, in that the view will save its state if the user uses a route in a view to change the current view. Normally this would help, but if it frequently updates the view changes back and then it flickers.
Overall it's ok if you really love web tech, but I'm learning native iOS development in response to my experience.