First iOS app in iOS Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the entry point of a SwiftUI iOS app?

The entry point is a struct that conforms to the App protocol, usually marked with @main. It defines the app's main scene.

beginner

What does the ContentView struct represent in a SwiftUI app?

It represents the main user interface view shown on the screen. It conforms to View and describes the UI layout.

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How do you display a simple text label in SwiftUI?

Use the Text view with a string, like Text("Hello World").

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What is the purpose of the body property in a SwiftUI view?

It defines the view's content and layout. SwiftUI reads it to render the UI on screen.

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How do you run your first iOS app on a simulator?

In Xcode, select a simulator device from the toolbar and click the Run button. The app will build and launch in the simulator.

Which protocol must the main app struct conform to in SwiftUI?

A View

B App

C Controller

D Delegate

The main app struct must conform to the App protocol to define the app's entry point.

What SwiftUI view is used to show text on the screen?

A Display

B Label

C StringView

D Text

The Text view displays text in SwiftUI.

Where do you write the UI layout code in a SwiftUI view?

A In the <code>body</code> property

B In the <code>init</code> method

C In the <code>main</code> function

D In the <code>AppDelegate</code>

The body property defines the UI layout in a SwiftUI view.

How do you start your app in Xcode to test it?

A Close the project and reopen

B Press Command + S

C Click the Run button after selecting a simulator

D Click the Stop button

You run the app by clicking the Run button after choosing a simulator device.

What attribute marks the main app struct as the app's entry point?

A @main

B @UIApplicationMain

C @AppEntry

D @Start

The @main attribute marks the app's entry point in SwiftUI.

Describe the basic structure of a first SwiftUI iOS app and how it shows a simple text on screen.

Think about the app entry point, main view, and how UI is built.

Explain the role of the body property in SwiftUI views and why it is important.

Consider how SwiftUI knows what to show on screen.