**Solved: No TabController for TabBar and TabBarView Flutter**
Hey there, fellow Flutter developers! Have you ever stumbled upon this pesky problem where you’re trying to create a TabBar alongside a TabBarView in Flutter, but you’re getting an error saying that there’s no TabController for your TabBar?
Don’t worry, you’re not alone! This is a common issue many of us have faced, especially if we’re new to Flutter or widget-oriented programming. But fear not, because today we’re going to tackle this problem once and for all.
**The Problem**
In Flutter, you can’t directly create a TabBar and a TabBarView without a TabController. That’s because the TabController serves as the bridge between your TabBar and TabBarView, allowing them to communicate with each other seamlessly.
The error you’re seeing is likely because you haven’t created and assigned a TabController to your TabBar and TabBarView. Without this crucial step, your widgets won’t know how to work together, resulting in a whole lot of confusion.
**The Solution**
So, how do you fix this issue? It’s actually quite simple! Here’s the step-by-step solution:
1. **Create a TabController**: First, you need to create a TabController. You can do this by using the `TabController` class, like so:
“`dart
TabController _tabController = TabController(length: 3, versus: true);
“`
In this example, we’re creating a TabController with a length of 3, which means it will have three tabs.
2. **Assign the TabController to your widgets**: Next, you need to assign the TabController to both your TabBar and TabBarView. You can do this by using the `controller` property on both widgets:
“`dart
TabBar(
controller: _tabController,
tabs: [
Tab(icon: Icon(Icons.directions_car)),
Tab(icon: Icon(Icons.directions_transit)),
Tab(icon: Icon(Icons.directions_bike)),
]
),
TabBarView(
controller: _tabController,
children: [
Center(child: Text(‘Tab 1’)),
Center(child: Text(‘Tab 2’)),
Center(child: Text(‘Tab 3’)),
]
),
“`
By assigning the same TabController to both widgets, you’re telling them how to communicate with each other. The TabBar will listen to the TabController’s changes, and the TabBarView will display the corresponding tab based on the TabController’s current index.
**Putting it all together**
Here’s the complete code snippet:
“`dart
import ‘package:flutter/material.dart’;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: DefaultTabController(
length: 3,
child: Scaffold(
appBar: AppBar(
bottom: TabBar(
controller: _tabController,
tabs: [
Tab(icon: Icon(Icons.directions_car)),
Tab(icon: Icon(Icons.directions_transit)),
Tab(icon: Icon(Icons.directions_bike)),
],
),
),
body: TabBarView(
controller: _tabController,
children: [
Center(child: Text(‘Tab 1’)),
Center(child: Text(‘Tab 2’)),
Center(child: Text(‘Tab 3’)),
],
),
),
),
);
}
}
“`
And that’s it! With these simple steps, you should now have a fully functional TabBar and TabBarView in Flutter.
