Flutter's setState(): Triggering UI Updates
setState() tells Flutter "my data changed, so rebuild the UI." It's not the change itself, but the notification that a change happened. Use it in a StatefulWidget's State class when events modify data your build() method uses.
setState() is the core mechanism for triggering UI updates in a StatefulWidget. Think of it as a broadcast: "My internal data has changed, so please schedule a rebuild to reflect it on screen." You call it when an event, like a button press, alters a variable that your build() method uses. The framework then re-runs build() to update the view. The footgun: putting heavy computation or async calls inside the setState callback. The callback must be synchronous and only contain the direct state mutation.
Read the original → api.flutter.dev
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- #dart
- #state management
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