Bottom navigation bar in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Bottom Navigation Bar in Flutter?

A Bottom Navigation Bar is a widget that displays navigation items at the bottom of the app screen. It helps users switch between different main sections of the app easily.

beginner

Which Flutter widget is commonly used to create a Bottom Navigation Bar?

The BottomNavigationBar widget is used to create a Bottom Navigation Bar in Flutter.

intermediate

How do you handle taps on Bottom Navigation Bar items in Flutter?

You use the onTap callback property of BottomNavigationBar. It gives the index of the tapped item, which you can use to update the UI or navigate.

beginner

What property controls which Bottom Navigation Bar item is currently selected?

The currentIndex property controls which item is highlighted as selected in the Bottom Navigation Bar.

beginner

Why is it important to keep Bottom Navigation Bar items to 3-5?

Keeping 3-5 items ensures the bar stays clear and easy to use. Too many items can clutter the bar and confuse users.

Which widget creates a Bottom Navigation Bar in Flutter?

A Drawer

B AppBar

C BottomNavigationBar

D TabBar

The BottomNavigationBar widget is specifically designed for bottom navigation in Flutter apps.

What property do you use to know which Bottom Navigation Bar item is selected?

A selectedItem

B highlightIndex

C activeTab

D currentIndex

The currentIndex property tells Flutter which item is currently selected.

How do you respond when a user taps a Bottom Navigation Bar item?

A Use onTap callback

B Use onPressed callback

C Use onSelect callback

D Use onClick callback

The onTap callback is used to detect taps on BottomNavigationBar items.

What is a good maximum number of items for a Bottom Navigation Bar?

A 3-5

B More than 8

C 6-8

D 2

3 to 5 items keep the navigation bar simple and user-friendly.

Where is the Bottom Navigation Bar usually placed in an app?

A On the left side

B At the bottom of the screen

C At the top of the screen

D Floating in the middle

As the name says, the Bottom Navigation Bar is placed at the bottom of the screen.

Explain how to create a Bottom Navigation Bar in Flutter and handle item taps.

Think about how you show different pages when tapping different icons.

Why should you limit the number of items in a Bottom Navigation Bar? What happens if you add too many?

Imagine a messy menu versus a clean one.