Material-ui-pickers: Formik does not mark as touched when focus on material-ui/pickers

[thanhmd]

Environment

| Tech | Version |
| -------------------- | ------- |
| @material-ui/pickers | 3.2.8 |
| formik | 2.1.2 |
| yup| | 0.28.0

Steps to reproduce

Change input or focus on the picker component

Expected behavior

Set touched object contain the name of the picker component

Actual behavior

Not working as expected

Live example

https://codesandbox.io/s/formik-material-ui-date-picker-with-yup-validate-3odn7?from-embed

[Blackburn29]

@thanhmd
While figuring out an issue with the latest 4.0-alpha builds I stumbled upon your issue. Your sandbox is missing the onBlur callback from Formik.

<KeyboardDatePicker
   ...
  onBlur={props.handleBlur}
/>

[eckertalex]

I had the same issue as OP. I will try that tomorrow.
Thank you for the response!

EDIT:
Sorry for the late response. Your solution fixes the issue.