Flutter setting a value of TextFormField according to setState of a widget variable

how can i set the value of a TextFormField from a widget variable when this variable changed according to a setstate action after building the widget and not by the initial value of this textformfeild
what i know that i can change its value by using the TextEditingController but i have too many TextFormField and creating the TextEditingController take a lot of code by using the traditional way by adding them the whole widget:
1-Create a TextEditingController.
2-Connect the TextEditingController to a text field.
3-Create a function to update the latest value.
4-Listen to the controller for changes.
is there any way to build this controller and do those steps inside the code of the TextFormField only? or another way ?

Solution 1:

place controler in

TextFormField(
      controller: TextEditingController(text: daytask),....

then place setstate() txt=''; like this

setState(() { txt='' }