Navigator.push and pop in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does Navigator.push do in Flutter?

It adds a new screen (route) on top of the current screen, showing the new screen to the user.

beginner

What is the purpose of Navigator.pop?

It removes the current screen from the top of the stack, going back to the previous screen.

intermediate

How does Flutter keep track of screens when using Navigator?

Flutter uses a stack to keep screens. New screens are pushed on top, and popping removes the top screen.

intermediate

What type of argument does Navigator.push expect?

It expects a BuildContext and a Route object, usually created by MaterialPageRoute.

intermediate

Can Navigator.pop return data to the previous screen?

Yes, you can pass a result back by providing an argument to Navigator.pop(context, result).

What happens when you call Navigator.push(context, route)?

A A new screen is shown on top of the current one.

B The app closes.

C The current screen is removed.

D Nothing happens.

Navigator.push adds a new screen on top of the current one.

Which method removes the current screen and goes back?

A Navigator.remove

B Navigator.push

C Navigator.pop

D Navigator.close

Navigator.pop removes the top screen and returns to the previous one.

What data structure does Navigator use to manage screens?

A Queue

B Stack

C List

D Map

Navigator uses a stack to manage screens, pushing and popping routes.

How do you pass data back when popping a screen?

A Navigator.pop(context, data)

B Navigator.push(context, data)

C Navigator.return(data)

D Navigator.send(data)

You pass data back by giving it as a second argument to Navigator.pop.

Which Flutter class is commonly used to create a route for Navigator.push?

A Container

B PageView

C Scaffold

D MaterialPageRoute

MaterialPageRoute creates a route that Navigator.push can use to show a new screen.

Explain how Navigator.push and Navigator.pop work together to manage screen navigation in Flutter.

Think about how a stack of cards works.

Describe how you can send data back to a previous screen when using Navigator.pop.

Consider returning a value when closing a screen.