App-Development-with-Swift-Certified-User Examsfragen & App-Development-with-Swift-Certified-User Testantworten

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Apple App-Development-with-Swift-Certified-User Exam Syllabus Topics:

SectionObjectives
Topic 1: View Building with SwiftUI- Use List Views to iterate through collections
- Create multiple Views to implement app logic
- Position and/or layout a single SwiftUI View with standard Views and modifiers
- Create a multi-view app with navigation Stacks, Links, and/or Sheets
- Extract Subviews to simplify the structure of an overlarge View
- Use @State, @Binding, @Environment, and/or Observable to share data between Views
Topic 2: Swift Programming Language- Demonstrate proper use of structs, classes
  • 1. Define and use property observers
  • 2. Differentiate between structures and classes
  • 3. Define and use properties and methods
  • 4. Differentiate between various initializers
- Evaluate variable scope and shadowing
- Use functions
  • 1. Create and call a function
  • 2. Organize and structure code
  • 3. Implement default parameter values
  • 4. Customize internal, external, and anonymous naming of parameters in functions
  • 5. Demonstrate how to use a function's return value
- Manage data using collection types
  • 1. Arrays
  • 2. Dictionaries
- Declare and use basic Swift types
  • 1. Demonstrate the use of type casting in both safe and unsafe ways
  • 2. Describe and use data types and operators
  • 3. Interpret and use basic types
  • 4. Demonstrate when to use constants and variables
- Demonstrate the use of Optional types
  • 1. Demonstrate how to unwrap Optionals safely
  • 2. Apply Optional binding and Optional chaining (including but not limited to if let, guard let)
- Know how and when to apply control flow and loops
  • 1. Use Guard
  • 2. Use logical operators
  • 3. Use range operators
Topic 3: Xcode Developer Tools- Use debugging techniques including, but not limited to, breakpoints, watchpoints, and logging to resolve errors
  • 1. Set breakpoints and step through code line by line
- Demonstrate how to build and run an app
  • 1. on the iOS simulator
  • 2. on the iOS device
- Identify and use the features of the Xcode interface
  • 1. Create and modify views with Interface Builder
  • 2. Demonstrate how to access documentation and help
  • 3. Navigate Xcode

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Apple App Development with Swift Certified User Exam App-Development-with-Swift-Certified-User Prüfungsfragen mit Lösungen (Q18-Q23):

18. Frage
Complete the code that will add the BlueView to the NavigationStack and present the RedView modally.

|Complete the code by typing in the boxes.

Antwort:

Begründung:
NavigationLink, .sheet
Explanation:
This question falls under View Building with SwiftUI , specifically the domain covering multi-view apps with navigation stacks, links, and sheets . The first blank must be NavigationLink because SwiftUI uses a navigation link inside a NavigationStack to push or present a destination view as part of the navigation hierarchy. Apple's documentation states that people tap or click a NavigationLink to present a view inside a NavigationStack or NavigationSplitView. That matches the first code section, where tapping " Show Blue View " should navigate to BlueView().
The second blank must be .sheet because the code uses isPresented: $showRedView, which is the standard SwiftUI sheet modifier for modal presentation controlled by a Boolean binding. Apple documents sheet (isPresented:onDismiss:content:) as the modifier to use when you want to present a modal view when a Boolean becomes true. Since the button toggles showRedView, SwiftUI presents RedView() modally as a sheet.
So the completed structure is effectively:
NavigationLink( " Show Blue View " ) {
BlueView()
}
sheet(isPresented: $showRedView) {
RedView()
}
This directly aligns with SwiftUI navigation and modal presentation patterns in the App Development with Swift objective domains.


19. Frage
Review the code snippet.

The code snippet does not compile.
Which two actions will fix the errors? (Choose 2.)

Antwort: B,D

Begründung:
This question belongs to Swift Programming Language , especially the domains covering basic Swift types
, operators , and constants versus variables .
There are two compile problems in the snippet. First, unitPrice and shipping are inferred as Double, while quantity is inferred as Int. In Swift, arithmetic operands must have compatible types; Swift does not automatically mix Int and Double in one arithmetic expression. So unitPrice * quantity fails unless quantity is changed to Double or explicitly converted. That makes A a correct fix.
Second, the line totalCost += ... uses the compound assignment operator +=, which stores a new value back into the left-hand side. Swift requires the left-hand side of += to be mutable, so totalCost must be declared with var, not let. That makes D the second correct fix.
The other choices do not solve the actual compile issues. B is unnecessary because totalCost is already explicitly declared as Double, so 0 is valid there. C would still leave shipping as Double, so the mixed-type arithmetic problem remains. E is irrelevant because shipping is never reassigned. Therefore, the two correct answers are A and D


20. Frage
Select the area in Xcode that allows you to display the Preview Canvas.

Antwort:

Begründung:

Explanation:
This question belongs to Xcode Developer Tools , specifically the objective domain on identifying and using the features of the Xcode interface . In the screenshot, the correct area is the upper-right corner of the editor toolbar , where Xcode provides the control for editor display options. Apple's documentation explains that to show previews, you can use the editor controls and specifically notes that you can click the Adjust Editor Options button and choose Preview , which displays the preview canvas to the right of the editor.
So, in hotspot terms, the correct selection is the editor options control near the top-right of the code editor
, not the Run button, not the Inspector, and not the Project navigator. This aligns with Apple's preview workflow for SwiftUI in Xcode, where the canvas is shown from the editor display controls. Apple also describes the preview canvas as part of Xcode's interface for quickly visualizing UI changes while editing code.


21. Frage
Review the code:

Given a struct called Animal, what line of code should be added on line 5 in order to produce the output shown?

Antwort: D

Begründung:
This question belongs to View Building with SwiftUI , especially the objective domain on using List views to iterate through collections and displaying model data in SwiftUI. In the code, animals is the data source passed into List(animals) { animal in ... }. That closure iterates through each element of the collection one at a time, and the parameter animal represents the current Animal instance for that row. To show the name of the current animal in the UI, the correct statement is Text(animal.name). SwiftUI's list documentation explains that each row inside a List must be a SwiftUI View, and a Text view is a standard way to display a string value for each item in the collection.
Option D is therefore correct because it accesses the name property of the current animal object being processed by the List closure. This is the standard SwiftUI pattern when iterating over identifiable model objects: pass the collection into List, receive each item in the closure, and build a row view from that item's properties. Apple's SwiftUI tutorials repeatedly use this collection-driven row-building pattern for lists and navigation.
The other options are incorrect for clear reasons. A incorrectly refers to the type name Animal instead of the current instance. B uses Animals with the wrong identifier and an invalid indexing approach. C also treats animal as an index rather than the current element object. Since the closure already gives you the current Animal, you directly access its property with animal.name.


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

Antwort: C

Begründung:
Comprehensive and Detailed Explanation From App Development with Swift domains:
This question belongs to View Building with SwiftUI , specifically the objective about extracting subviews to simplify the structure of an overlarge view . The correct answer is C because the standard SwiftUI approach to modularizing a large interface is to create a separate custom view, usually as a new struct conforming to View, and then use that view inside the main view. Apple's tutorials and documentation repeatedly show this pattern: move part of the UI into its own SwiftUI view type, then compose the main screen from smaller view components.
Option A is not the primary SwiftUI pattern for extracting a reusable subview. Option B does the opposite of modularization, because it keeps everything in the same large body. Option D is about state management and data flow, not about extracting a visual component into its own reusable subview. Apple's SwiftUI materials emphasize composition, where views are lightweight and can be split into smaller reusable pieces for clarity, maintainability, and reuse. WWDC guidance also shows Xcode's "Extract Subview" workflow, which creates a separate view structure from selected UI code.


23. Frage
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