1.Open Xcode
2.Find 5GB update
3.Close and go back to Android studio.

haha, I have a cross platform app coming soon istarting development n January. I might go with Cordova. Please advise for me on Cordova?

4. Open up Android SDK Manager and cry as well :(

How can you have a 5go update?

@navz I used Cordova & SenchaTouch about 3 years ago. It was not an enjoyable experience; mostly fine, but some ui operations were laggy with a lot of time to fix minor issues on different (Android) devices - iOS was much smoother.
I've recently started using react not native yet - so cannot comment much. Although I'm guessing you would probably get a better ux as it use the native platform widgets.
You could also use NativeScript (with angular2 or vanilla-js) if you prefer a different framework.

Both of these are free and open-source, Although react has a weird BSD+Patents, if you work somewhere at some EvilCorp who really cares about licenses :/

@tirrorex Am also wondering.Apple should answer this.

@navz I prefer Xamarin

@dontbeevil Used xamarin on another project; used mvvm pattern. Was happy with the code-base, but development tools was very hard. Had to keep switching between xcode's IB and Android Studio and visual studio. The UI editing was very very time consuming and buggy.
If I had to chose between xamarin and c/c++, would probably chose to write a lib in c and do the UI in native ios/android.