Apple App-Development-with-Swift-Certified-User練習問題 & App-Development-with-Swift-Certified-User日本語版試験解答

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

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

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                        Apple App Development with Swift Certified User Exam 認定 App-Development-with-Swift-Certified-User 試験問題 (Q14-Q19):

                        質問 # 14
                        Review the code snippet.

                        The " faces " dictionary contains emojis and their descriptions.
                        Which code will create an array named " emo)is " that will copy all the emojis from the " faces " dictionary?

                        正解：D

                        解説：
                        This question belongs to Swift Programming Language , specifically the objective on managing data using collection types , including dictionaries and arrays . In the dictionary shown, the emojis are the keys and the text descriptions are the values . Swift provides a keys property on dictionaries that returns a collection containing all dictionary keys. To convert that keys collection into an array, you use the Array(...) initializer.
                        Therefore, the correct code is let emojis = Array(faces.keys). Apple documents both the Dictionary.keys property and the Array type used to store a sequence of values of the same type.
                        Option B is incorrect because faces.values would return the descriptions like " grinning " , " thinking " , and " happy " , not the emoji keys. Options A and C are incorrect because List is a SwiftUI view type, not the correct collection type for creating an array from dictionary contents. Also, the dictionary interface uses properties like .keys and .values, not method calls like .keys() or .values(). Apple's dictionary documentation makes clear that keys is a property returning a collection of the dictionary's keys.


                        質問 # 15
                        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 # 16
                        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.

                        正解：

                        解説：

                        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:


                        質問 # 17
                        Review the code.
                        var capitalCities = [ " USA " : " Washington D.C. " , " Spain " : " Madrid " , " Peru " : " Lima " ] Which two statements add the capital city of " Italy " to the dictionary? (Choose 2.)

                        正解：B、C

                        解説：
                        Comprehensive and Detailed Explanation From App Development with Swift domains:
                        This question falls under Swift Programming Language , specifically the domain for managing data using collection types , with emphasis on dictionaries . In Swift, a dictionary stores data as key-value pairs , so in this example the country name is the key and the capital city is the value. To add a new entry, Swift supports two standard approaches. The first is subscript assignment , which is shown in option C : capitalCities[ " Italy " ] = " Rome " . Apple's documentation explains that you can add a key-value pair to a dictionary by assigning a value for a new key through the dictionary subscript.
                        The second correct approach is option E : capitalCities.updateValue( " Rome " , forKey: " Italy " ). Apple documents that updateValue(_:forKey:) updates the value for an existing key, or adds a new key-value pair if the key does not already exist . That makes it equally valid for inserting " Italy " : " Rome " into the dictionary.
                        The incorrect options fail for different reasons. A reverses the key and value, making " Rome " the key and " Italy " the value. B is wrong because append is used with arrays, not dictionaries. D is not the standard valid insertion syntax for Swift dictionaries in this context; Swift's documented mutation approaches here are subscript assignment and updateValue. Therefore, the two correct answers are C and E .


                        質問 # 18
                        You are creating or updating human resource records for your employees. For each identifier, select whether it is a Constant or a Variable Note: You will receive partial credit for each correct answer.

                        正解：

                        解説：

                        Explanation:
                        * age - Variable
                        * birthDate - Constant
                        * socialSecurityNumber - Constant
                        * salary - Variable
                        * currentDepartment - Variable
                        This question belongs to Swift Programming Language , specifically the objective on demonstrating when to use constants and variables . In Swift, a constant is declared with let and is used for values that should not change after they are set. A variable is declared with var and is used for values that may change over time.
                        Birth date is a constant because a person's date of birth does not change. Social security number is also a constant because it is intended to be a fixed identifier for that employee record. By contrast, age is a variable because it changes over time. Salary is a variable because compensation can be adjusted. Current department is also a variable because an employee may transfer to another department.
                        This matches Swift best practice: use let for fixed data and var for mutable data. So in a human resources record, identifiers that are permanent should be constants, while values that can change during employment should be variables.


                        質問 # 19
                        ......

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