Today we have the explanation and solution for iPad as below:
- When your iPad/iPhone is connected to an external scanner and the scanner is configured as a Human Interface Device (HID mode), the scanner will look like an external keyboard for your iPad/iPhone.
- Therefore, your iPad/iPhone will then hide the ordinary on-screen keyboard. If you turn off the scanner or disconnect the scanner from your iPad/iPhone, your ordinary on-screen keyboard will display as normal again.
However, if you are using iPad, you will always have a menu showing where the ordinary on-screen keyboard usually is located. Here you can choose manually to show the on-screen keyboard at all time - see screenshot below.
Hope this will help 