ParentalGateViewController,ToTextfieldScrollViewController,ViewScrollingController

ViewScrollingController - base class for ToTextfieldScrollViewController that change scrollView inset.
ToTextfieldScrollViewController - move scroll from textField to textField (depends of tags or position in view)
ParentalGateViewController - controller inherited from ToTextfieldScrollViewController. Nice controller but only for
"+", "-", "*, "/"" operations