有效更新 SetState() 中的一系列变量（Dart-Flutter）

Question

I can't find a simple way to update a series of variables in my Flutter project. I first tried using Enums and functions to change the variables inside a setState((){}) call. I have something like this:

  void changeMode(Mode mode) {
if (mode == Mode.start) {
  print('App is now in start mode');
  mode = Mode.start;
  bool1 = true;
  bool2 = false;
  bool3 = false;
  color1 = kAColor1;
  color2 = kAColor2;
} else if ...}

But nothing gets updated, I imagine it's due the fact that my function doesn't return anything.

If I hard code every single variable in setState((){}) it works fine, but it's absolutely inefficient and a mess to correct.

Maybe I should go with classes? Would I need to create a superclass containing all the subclasses to do something like this?

Answer 1

Every time that you call setState you UI will rebuild. You can use class or map to manipulate your data.

With class:

setState(() {
  currentData = actualData.copyWith(bool1: false)
})

This way, you change only data that is different from currentData . On this example, I maintain all information from currentData and change only bool1 value.

Obs: copyWith is a factory that return the same type of currentData .