Ionic not showing “Done” label for dropdown HTML select tag

I am building hybrid app using ionic. I am using some forms fields on
the app. Those fields includes some HTML select tags. It is working
perfectly on android but when I test it on iPhone, it does not allow me
to leave the HTML select options as it does not display “Done” label. Here is the link of the screenshot.

I have commented these lines but no change is reflected when I test it on iPhone:

   if (window.cordova && window.cordova.plugins.Keyboard) {

I have also tried this: cordova.plugins.Keyboard.hideKeyboardAccessoryBar(false);
Again “Done” label is not showing on iPhone.

What am I be doing wrong? Any solutions would be highly appreciated.