UITextField's property isSecureTextEntry when turned on prevents user for taking screenshot of those textfield. I think they might use this. https://developer.apple.com/documentation/uikit/uitextinputtraits/issecuretextentry

Cell layout is not updated until cell is reused. if you want tableview to reflect the changed constraints of cells. one solution is to reload the cells whose layout constraints have been updated using tableview.reloadRows(at: [IndexPath], with: animation) other solution is tableview.beginUpdates() tableview.setNeedsDisplay() tableview.endUpdates()