We call setState only when we want the change in a variable to reflect on the UI of the screen. For instance, say you have a form containing a text field and a button to submit it. User types in the text field and clicks on submit button. Then we display that text field’s text below the submit button.20 Haz 2021
Read moreHow do you define a state in flutter?
State is information that (1) can be read synchronously when the widget is built and (2) might change during the lifetime of the widget. It is the responsibility of the widget implementer to ensure that the State is promptly notified when such state changes, using State. setState .
Read moreIs initState called after setState?
Because we can’t call setState() directly in the initState method, we can’t call it from a function called by initState either. Unless this function is asynchronous and the setState call is made after the first await .
Read moreWhat is the use of state in flutter?
According to Flutter, State is the information that can be read synchronously when the widget is built and might change during the lifetime of the widget . State objects are created by the framework.
Read moreWhat is change notifier in Flutter?
ChangeNotifier is a simple class included in the Flutter SDK which provides change notification to its listeners . In other words, if something is a ChangeNotifier , you can subscribe to its changes.
Read moreWhat is the alternative of setState in Flutter?
The short answer is that just add currentIndex as one of the parameter inside your navBarSection . Inside home. dart , just pass the currentIndex of the page.
Read moreWhat is Valuelistenablebuilder in Flutter?
A widget whose content stays synced with a ValueListenable . Given a ValueListenable<T> and a builder which builds widgets from concrete values of T , this class will automatically register itself as a listener of the ValueListenable and call the builder with updated values when the value changes.
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