material-components-ios-codelabs
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keyboard appears and pushes the bottom sheet to its top
MDCBottomSheetController with a contentViewController that contains an UITextField. When the textfield becomes first responder, the keyboard appears and pushes the bottom sheet to its top.

The expected behaviour is that the UIKeyboard slides over the BottomSheet and not push it up.
this issue still pending. I guess it should be raised on https://github.com/material-components/material-components-ios/issues
same issue :/