Navigation path management in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to push a new view controller onto the navigation stack.

iOS Swift

navigationController?.[1](UIViewController(), animated: true)

Drag options to blanks, or click blank then click option'

Apresent

BpopViewController

Cdismiss

DpushViewController

Attempts:

3 left

💡 Hint

Common Mistakes

Using popViewController instead of pushViewController

Using present which is for modal presentation

Use pushViewController to add a new screen to the navigation stack.

2fill in blank

medium

Complete the code to pop the current view controller from the navigation stack.

iOS Swift

navigationController?.[1](animated: true)

Drag options to blanks, or click blank then click option'

ApushViewController

BpopViewController

Cpresent

Ddismiss

Attempts:

3 left

💡 Hint

Common Mistakes

Using pushViewController which adds a screen instead of removing

Using dismiss which is for modal views

Use popViewController to remove the current screen and go back.

3fill in blank

hard

Fix the error in the code to set the root view controller of the navigation controller.

iOS Swift

navigationController?.[1] = [UIViewController()]

Drag options to blanks, or click blank then click option'

AvisibleViewController

BtopViewController

CviewControllers

DrootViewController

Attempts:

3 left

💡 Hint

Common Mistakes

Using rootViewController which is not a property of UINavigationController

Using topViewController which is read-only

The viewControllers property sets the stack of view controllers, starting with the root.

4fill in blank

hard

Fill both blanks to pop to the root view controller with animation.

iOS Swift

navigationController?.[1](animated: [2])

Drag options to blanks, or click blank then click option'

ApopToRootViewController

BpopViewController

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using popViewController which only pops one screen

Setting animation to false which disables transition effect

popToRootViewController(animated: true) returns to the first screen with animation.

5fill in blank

hard

Fill all three blanks to replace the current navigation stack with two new view controllers.

iOS Swift

navigationController?.[1] = [[2], [3]]

Drag options to blanks, or click blank then click option'

AviewControllers

BFirstViewController()

CSecondViewController()

DrootViewController

Attempts:

3 left

💡 Hint

Common Mistakes

Using rootViewController which is not a UINavigationController property

Passing class names instead of instances

Setting viewControllers replaces the stack. Provide new view controller instances in an array.