CODEWITHSUNDEEP
flutterdart
Sanjeev S
Sanjeev S

Reputation: 17

Flutter: Conditional switches and adding/removing from a list

I'm trying to create a switch that will either add or remove a value from a list.

I've created my stateful widget and a boolean variable for my switch:

class CustomisePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _CustomisePageState();
  }
}

class _CustomisePageState extends State<CustomisePage> {
  List<String> names = ["Name 1", "Name 2", "Name 3", "Name 4"];
  bool isSwitched = true;

I've created my switch with a conditional statement checks whether the switch is turned "on", and the list doesn't contain the value "Name 1", then adds the value to the list names. If the switch is turned "off", it removes "Name 1" from the list.

SwitchListTile(
  activeColor: Colors.amber,
  value: isSwitched,
  onChanged: (value) {
    setState(() {
      isSwitched = value;
      if (isSwitched = true && names.contains("Name 1") = false) {
        names.add("Name 1");
      } else {
        names.remove("Name 1");
      }
    });
  },
  title: Text("Name 1"),
  secondary: const Icon(Icons.add),
)

This issue however is that Flutter/Dart doesn't like "games.contains("Name 1") = false" statement I've created to check if the value is in the list.

I would really appreciate any help, or even advice on improving my code to make it more efficient!

Upvotes: 1

Views: 1183

Answers (2)

Mohammad_Asef
Mohammad_Asef

Reputation: 336

As mentioned before using single = is for assigning a value, it is not comparable operator if you want to check equality you must use this == operator.

Upvotes: 0

aqwert
aqwert

Reputation: 10789

try isSwitched == true && names.contains("Name 1") == false or better isSwitched && !names.contains("Name 1")

Using a single = is an assignment which cannot be done here

Upvotes: 2

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