Xamarin Certification Xamarin.iOS Development 2

Question 1

Which Xamarin.iOS method is called when the app moves to the background?

Accepted Answer

DidEnterBackground

Answer

DidEnterBackground in AppDelegate is called when the application transitions to the background state.

Question 2

What is the role of UIViewController in Xamarin.iOS?

Accepted Answer

Manages a single screen's view and lifecycle

Answer

UIViewController controls a single screen, managing the view hierarchy and responding to lifecycle events.

Question 3

In Xamarin.iOS, how do you navigate to a new view controller using a UINavigationController?

Accepted Answer

PushViewController

Answer

PushViewController pushes a new UIViewController onto the navigation stack.

Question 4

Which API is used in Xamarin.iOS to request permission to send push notifications?

Accepted Answer

UNUserNotificationCenter.Current.RequestAuthorization

Answer

UNUserNotificationCenter.Current.RequestAuthorization is the modern API for requesting notification permissions on iOS.

Question 5

What does the Linker do in a Xamarin.iOS release build?

Accepted Answer

Removes unused code to reduce app size

Answer

The Xamarin.iOS linker performs static analysis to strip unused managed code, reducing the final binary size.

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