Sencha - I have a webapp with a registration form that works correctly on Safari. However, for some reason when adding the page to home screen (using ios webview) this issu
I faced the same issue. In my case i am using jquery mobile and to solve this issue i added the attribute "autofocus" to the input field. This seems to simulate a first tap on the field whereas the tap by the user opens the keyboard and he will be able to write to the field.
Hope this helps.