class 1{ //in the class where you need to use the callback declare as field Function(String value) onChanged, //then use the function as inChanged callback eventually adding code TextField( onChanged: (value){ onChanged(value); state.didChange(value); }, ) } //in the other class pass the function like this class 2{ new 1({ ... onChanged: (value) { = value; }, ... }); }

flutter use valuechanged function in function

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