title: Slide focus to TextField in Flutter
body: <p>I have been learning flutter for last few days and I encountered a problem while developing my app. So I have a basic form containing all the basic input fields and after a user clicks the submit button the app checks for the validity of the text field. If there is some wrong entry the app moves focus back to the text field. </p>
  
  <p>How can I move focus back to the Text Field?</p>