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Apple App Development with Swift Certified User Sample Questions:

1. Why does the initializer for the following struct need the keyword self?

A) self is always needed when you are setting properties in an initializer.
B) self is needed to distinguish between the property and the parameter with the same name.
C) self is used to indicate to the reader that the parameter is being referenced.
D) self is only needed when the property does not have a default value.

2. In SwiftUI, how can you extract a subview from a main view to make the code more modular?

A) Create a new SwiftUI view struct and call it in the main view.
B) Declare the subview as a variable inside the main view and call it directly.
C) Use @State to manage subview content and use a binding to create a two-way connection.
D) Add the subview's code directly into the main view's body.

3. Review the code snippet and then predict the output.

A) Total count: 20
B) Total count: 10
C) Total count: 11
D) Total count: 9

4. Complete the code that conforms to the View protocol by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct answer.

5. You have created a view which includes some formatted text:

You decide to extract this formatted text into a subview so that you can reuse the formatting for other texts.
You highlight the Text and choose Extract subview.
You refactor ExtractedView to BigGreenTextView.
You add the line let text: String to the extracted view above the body.
You replace " That ' s all folks " with a reference to text
How should you call this extracted View from the original View?

A) BigGreenTextView(text: text)
B) BigGreenTextView(text: " That ' s all folks " )
C) BigGreenTextView( " That ' s all folks " )
D) BigGreenTextView(text)

Solutions: