Apple App-Development-with-Swift-Certified-User證照考試 - App-Development-with-Swift-Certified-User題庫更新

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

SectionObjectives
Topic 1: App Logic and Data Handling- Data management in apps
  • 1. Simple persistence concepts
    • 2. Model-view-controller (MVC) basics
      • 3. Arrays and collections
        Topic 2: App Lifecycle and Deployment Concepts- Understanding app structure
        • 1. App lifecycle events
          • 2. Debugging and testing basics
            Topic 3: Introduction to App Development with Swift- Swift programming fundamentals
            • 1. Operators and expressions
              • 2. Control flow (if, switch, loops)
                • 3. Variables, constants, and data types
                  Topic 4: User Interface Development- Building iOS interfaces
                  • 1. UIKit fundamentals
                    • 2. Auto Layout basics
                      • 3. Views and layout concepts

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                        最新的 Apple App Development with Swift App-Development-with-Swift-Certified-User 免費考試真題 (Q31-Q36):

                        問題 #31
                        Review the code snippet.

                        What will print after the final line of code is executed?

                        答案：

                        解題說明：
                        Answer the question by typing in the box.
                        2
                        Explanation:
                        This question belongs to Swift Programming Language , specifically the objective on variable scope and shadowing .
                        The code first declares:
                        let even = 2
                        This creates a constant named even in the outer scope with the value 2.
                        Inside the for loop, the code declares another constant with the same name:
                        let even = num * 2
                        This inner even exists only inside the loop body. It shadows the outer even, which means that within the loop, the name even refers to the loop's local constant, not the original one. However, that inner constant goes out of scope at the end of each loop iteration.
                        After the loop finishes, the inner even no longer exists. So when the final line runs:
                        print(even)
                        Swift uses the original outer constant, which is still 2.
                        So the output is:
                        2
                        This question tests two important Swift concepts:
                        * Scope : where a variable or constant can be accessed
                        * Shadowing : when a local declaration temporarily hides another declaration with the same name Therefore, the correct answer is 2 .


                        問題 #32
                        Review the code snippet.

                        What value does the code output?

                        答案：

                        解題說明：
                        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 .


                        問題 #33
                        Given the function, which two function calls are valid? (Choose 2.)

                        答案：A,D

                        解題說明：
                        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 .


                        問題 #34
                        When you press ' Show Button ' on your app. a modal View appears.
                        Complete the code by selecting the correct option from each drop-down list.
                        Note: You will receive partial credit for each correct answer.

                        答案：

                        解題說明：

                        Explanation:

                        This question belongs to View Building with SwiftUI , specifically the domain on creating a multi-view app with navigation stacks, links, and sheets .
                        To present a modal view in SwiftUI when a Boolean state changes, the correct modifier is .sheet . The matching sheet API for a Boolean binding is:
                        sheet(isPresented: $showInfo) {
                        // modal content
                        }
                        So the first blank must be .sheet , and the second blank must be (isPresented: .
                        The logic works like this:
                        * @State stores the local Boolean that controls presentation.
                        * Pressing the button calls showInfo.toggle(), changing the value from false to true.
                        * When that Boolean becomes true, the .sheet(isPresented:) modifier presents the modal view.
                        * When the modal is dismissed, SwiftUI updates the Boolean back as needed.
                        There is also a typing issue in the screenshot: the state variable appears as ShowInfo, while the button and binding use showInfo. Swift is case-sensitive, so those names must match. The corrected code should use the same identifier consistently, such as:
                        @State var showInfo = false
                        Therefore, the correct dropdown selections are:
                        sheet
                        (isPresented:


                        問題 #35
                        Which two statements about building an app are true? (Choose 2.)

                        答案：B,D


                        問題 #36
                        ......

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