App-Development-with-Swift-Certified-User試験問題 & App-Development-with-Swift-Certified-User認証pdf資料

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

SectionWeightObjectives
Topic 1: App Design and Best Practices15%- Code organization
  • 1. Readability and maintainability
- User experience principles
  • 1. Human Interface Guidelines
Topic 2: Data Handling and Logic15%- Basic data processing
  • 1. Working with strings and numbers
- Error handling
  • 1. Do-catch and optional handling
Topic 3: SwiftUI Basics25%- Views and controls
  • 1. Modifiers and styling
  • 2. Built-in UI components
- State management
  • 1. Data flow between views
  • 2. Basic state properties
- Layout and navigation
  • 1. Stacks, grids and alignment
  • 2. Navigation patterns and presentation
Topic 4: Swift Programming Fundamentals30%- Functions
  • 1. Definition, parameters and return values
  • 2. Parameter customization and default values
- Basic types and operators
  • 1. Data types, type inference and casting
  • 2. Constants and variables
- Collection types
  • 1. Arrays, dictionaries and sets
- Control flow
  • 1. Conditional statements and loops
  • 2. Switch statements and pattern matching
- Structures and classes
  • 1. Properties, methods and initializers
Topic 5: Development Environment15%- Building and running apps
  • 1. iOS Simulator usage
  • 2. Deploying to physical devices
- Xcode interface and tools
  • 1. Navigating project structure
  • 2. Using documentation and help resources
- Debugging techniques
  • 1. Breakpoints and step-through execution
  • 2. Logging and error resolution

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Apple App Development with Swift Certified User Exam 認定 App-Development-with-Swift-Certified-User 試験問題 (Q38-Q43):

質問 # 38
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?

正解：D

解説：
This question belongs to View Building with SwiftUI , specifically the domain on extracting subviews to simplify the structure of an overlarge View .
When you create a custom SwiftUI view and add a stored property like:
let text: String
that property becomes part of the view's initializer. Since the property name is text, Swift expects you to pass the value using the parameter label text: when creating the view. So the correct call is:
BigGreenTextView(text: " That ' s all folks " )
That makes B the correct answer.
Why the others are wrong:
* A is incorrect because this is not using the expected parameter label.
* C would only be correct if there were already another variable named text in the calling scope and you wanted to pass that variable instead of the literal string shown in the question.
* D is incorrect because it omits the parameter label.
This is a standard SwiftUI pattern: extract reusable formatting into a separate custom View, give it an input property, and then pass the needed value through the initializer using the property label.


質問 # 39
Which two statements about building an app are true? (Choose 2.)

正解：B、E


質問 # 40
If View A calls View B, which Swift Property Wrapper would you use in View B in order to return the value of a state to View A?

正解：A

解説：
Comprehensive and Detailed Explanation From App Development with Swift domains:
This question belongs to View Building with SwiftUI , specifically the objective on using @State,
@Binding, @Environment, and observable data to share data between views.
The correct answer is @Binding because @Binding creates a two-way connection to a value that is owned by another view. In this scenario, View A owns the state, and View B needs to read and modify that value so the change is reflected back in View A. Apple's SwiftUI documentation describes a binding as a reference to a mutable value that is owned elsewhere, which is exactly the pattern used when a child view needs to update a parent view's state. ( developer.apple.com )
@State is not correct for View B here because @State is used for local state owned by that specific view. If View B used @State, it would manage its own separate copy rather than updating the parent's value.
@Environment is used to access values provided by the system or ancestor views, not for directly returning a specific parent state value in this pattern. @Observable is related to observable model objects and is not the direct property wrapper used in a child view for two-way parent-child state passing. ( developer.apple.com ) So when View A passes a state value into View B and expects updates to flow back, View B should use
@Binding .


質問 # 41
Select the location to set this app to run on an iPhone 14 in the simulator.

正解：

解説：

Explanation:

This question belongs to Xcode Developer Tools , specifically the domain for building and running an app on the iOS simulator . In Xcode, the place where you choose whether the app runs on a simulator or a connected device is the run destination / scheme destination selector in the toolbar. This control appears near the top center of the Xcode window and displays the current destination, such as a simulator model or device target. To run the app on iPhone 14 , you click that selector and choose iPhone 14 from the available simulator list. Apple's Xcode documentation describes choosing a run destination before building and running the app in Simulator or on a device.
So, for the hotspot, the correct place is the device/simulator dropdown in the top toolbar , not the preview canvas controls, not the project navigator, and not the code editor. That selector determines where the app launches when you press Run.


質問 # 42
Review the code snippet and then predict the output.

正解：A

解説：
This question belongs to Swift Programming Language , especially the domains covering control flow , loops , logical operators , and guard . The loop runs through 0.. < max, and since max = 101, the values of num are 0 through 100. Inside the loop, the guard statement keeps only values that satisfy both conditions:
* num % 5 == 0 # the number must be divisible by 5
* num % 2 != 0 # the number must be odd
So the code counts numbers from 0 to 100 that are odd multiples of 5 . Those values are:
5, 15, 25, 35, 45, 55, 65, 75, 85, 95
That gives a total of 10 numbers. Therefore count becomes 10, and the printed output is:
Total count: 10
The key Swift concept here is that guard ... else { continue } skips any loop iteration that does not meet the required condition. Only matching values reach count += 1. This is a standard use of guard for early exit and of the remainder operator % for divisibility checks. Therefore, the correct answer is B .


質問 # 43
......

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