App-Development-with-Swift-Certified-User시험대비최신공부자료 & App-Development-with-Swift-Certified-User퍼펙트최신버전덤프자료

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

SectionObjectives
Topic 1: 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
- Identify and use the features of the Xcode interface
  • 1. Navigate Xcode
  • 2. Demonstrate how to access documentation and help
  • 3. Create and modify views with Interface Builder
- Demonstrate how to build and run an app
  • 1. on the iOS simulator
  • 2. on the iOS device
Topic 2: Swift Programming Language- 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. Demonstrate when to use constants and variables
  • 3. Interpret and use basic types
  • 4. Describe and use data types and operators
- Demonstrate proper use of structs, classes
  • 1. Differentiate between various initializers
  • 2. Define and use properties and methods
  • 3. Differentiate between structures and classes
  • 4. Define and use property observers
- Know how and when to apply control flow and loops
  • 1. Use logical operators
  • 2. Use Guard
  • 3. Use range operators
- Evaluate variable scope and shadowing
- Use functions
  • 1. Implement default parameter values
  • 2. Organize and structure code
  • 3. Create and call a function
  • 4. Customize internal, external, and anonymous naming of parameters in functions
  • 5. Demonstrate how to use a function's return value
- Demonstrate the use of Optional types
  • 1. Apply Optional binding and Optional chaining (including but not limited to if let, guard let)
  • 2. Demonstrate how to unwrap Optionals safely
Topic 3: View Building with SwiftUI- Create a multi-view app with navigation Stacks, Links, and/or Sheets
- 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
- Extract Subviews to simplify the structure of an overlarge View
- Use @State, @Binding, @Environment, and/or Observable to share data between Views

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App-Development-with-Swift-Certified-User퍼펙트 최신버전 덤프자료 - App-Development-with-Swift-Certified-User시험대비 최신버전 덤프자료

관심있는 인증시험과목Apple App-Development-with-Swift-Certified-User덤프의 무료샘플을 원하신다면 덤프구매사이트의 PDF Version Demo 버튼을 클릭하고 메일주소를 입력하시면 바로 다운받아Apple App-Development-with-Swift-Certified-User덤프의 일부분 문제를 체험해 보실수 있습니다. PDF버전외에 온라인버전과 테스트엔버전 Demo도 다운받아 보실수 있습니다.

최신 Apple App Development with Swift App-Development-with-Swift-Certified-User 무료샘플문제 (Q23-Q28):

질문 # 23
Given the function, which two function calls are valid? (Choose 2.)

정답：A,B

설명：
This question belongs to Swift Programming Language , specifically the domain on functions , including internal and external parameter names and default parameter values .
The function is defined as:
func rightSum(_ num1: Int, by num2: Int, and num3: Int = 25) - > Int {
return num1 + num2 + num3
}
This means:
* the first parameter uses _, so it has no external label
* the second parameter must use the external label by
* the third parameter must use the external label and
* the third parameter also has a default value of 25, so it may be omitted Now evaluate each option:
* A is invalid because it uses num2: instead of the required external label by:
* B is valid because it correctly uses no label for the first argument, then by: and and:
* C is invalid because the first parameter cannot be called with num1: since the external label is omitted with _
* D is valid because it correctly passes the first argument unlabeled and the second with by:, while omitting the third argument so Swift uses the default value 25
* E is invalid because it uses num1: and num2: instead of the required calling syntax So the two correct function calls are B and D .


질문 # 24
Match the Swift Properly Wrapper names to the correct descriptions.

정답：

설명：

Explanation:
* @AppStorage # This property wrapper reads and writes values from UserDefaults.
* @Environment # This property wrapper allows you to access data from the system, such as knowing the size class of the device, or dismissing a view.
* @Binding # When a variable is declared with this property wrapper, changes to its value will be returned to the calling view.
* @State # When a variable is declared with this property wrapper, it is used to store small amounts of data local to the view whose value may affect the appearance of the view.
This question belongs to View Building with SwiftUI , specifically the objective about using @State,
@Binding, @Environment, and related wrappers to share and manage data between views. @AppStorage is the wrapper that connects a SwiftUI value to UserDefaults, so it is the correct match for reading and writing persisted user defaults data. Apple documents AppStorage as a property wrapper type that reflects a value from UserDefaults and updates the view when that value changes.
@Environment is used to read values supplied by the system or ancestor views, including interface context like size classes and actions such as dismissing a presented view. Apple's environment documentation explains that SwiftUI automatically sets and updates many environment values for layout and behavior, and App Dev Training materials show environment values being used to dismiss a view.
@Binding represents a two-way connection to a value owned elsewhere, typically in a parent view, so changes made through the binding are reflected back in the source of truth. Apple's SwiftUI data-flow guidance describes bindings as the mechanism used when a child view needs shared control of state with another view.
@State is the correct wrapper for small, local, mutable view state. Apple describes State as the source of truth for data local to a view and recommends it for interface state that affects rendering.


질문 # 25
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.

정답：

설명：

Explanation:

This question belongs to View Building with SwiftUI , especially the domain covering positioning and/or layout a single SwiftUI View with standard Views and modifiers and the foundational structure of a SwiftUI view. In SwiftUI, a custom screen is typically declared as a struct that conforms to the View protocol. Apple's SwiftUI documentation shows the standard pattern:
struct ScreenView: View {
var body: some View {
Text( " Hello " )
}
}
Here, struct is required because SwiftUI views are commonly defined as structures. View is required after the colon because the type must conform to the View protocol. body is the required computed property that returns the content of the view as some View. Apple documents that every conforming View type must provide a body property that describes its content.
So the completed code is:
import SwiftUI
struct ScreenView: View {
var body: some View {
Text( " Hello " )
}
}
This is the canonical SwiftUI view declaration pattern and is one of the most fundamental concepts in App Development with Swift.


질문 # 26
Review the code snippet.

What value does the code output?

정답：

설명：
Answer the question by typing in the box.
2
Explanation:
This question belongs to Swift Programming Language , specifically the objectives covering functions , control flow , and default parameter values . The function is declared as func getAgeCategory(_ age: Int =
20) - > Int, which means if no argument is supplied, Swift uses the default value 20. Apple's Swift documentation explains that you can define a default value for any parameter, and that value is used when the caller omits that argument. Since the code calls getAgeCategory() with no parameter, the function executes using age = 20.
The conditional logic is then evaluated in order:
* if age > 64 # false, because 20 is not greater than 64
* else if age > 19 # true, because 20 is greater than 19
* so the function returns 2
Because Swift's if / else if control flow stops at the first true condition, the later checks are never reached once age > 19 succeeds. Apple describes Swift as supporting standard control flow including conditional branching, and this example is a direct use of that branching behavior.
Therefore, print(getAgeCategory()) outputs 2 , which corresponds to option B .


질문 # 27
Review the code.
Note: You might need to scroll to see the entire block of code.

A breakpoint is set on line 3. When the application is run. it will stop at line 3. You need to debug the code.
Drag each debugging control from the left to the correct instruction on the right. You will receive partial credit for each correct answer

정답：

설명：

Explanation:
This question belongs to Xcode Developer Tools , especially the objective on using debugging techniques including breakpoints and stepping controls .
When execution stops at a breakpoint on line 3, Step Over runs that line without entering into another function call, so it is the correct action for moving past line 3 while staying in the current function. Step Into is used when execution reaches line 4 and you want to enter the display(numbers) function, which takes you into the function body starting at line 8. Once inside that function, Step Out continues execution until the current function returns, which is exactly what "step out from line 8" means.
Deactivate breakpoints turns breakpoint handling off so the debugger no longer stops on active breakpoints.
Continue program execution resumes the app until the next breakpoint or until the program finishes.
So the correct control order is:
1 = Continue
2 = Deactivate breakpoints
3 = Step Over
4 = Step Into
5 = Step Out


질문 # 28
......

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