App Development with Swift Certified User Apple Practice Questions
Prepare for App Development with Swift Certified User with more than an answer.
- Exam fee
- $162 USD
- Time limit
- 50 minutes
- Questions on the exam
- 40
- Passing score
- 700/1000 (scale 0-1000)
- Level
- Certified User
- Valid for
- Does not expire (no recertification required)
Domains covered on the exam 3
- Xcode Developer Tools25%
- Swift Programming Language50%
- View Building with SwiftUI25%
- 1
A junior developer is building a weather application. Upon launching the app in the simulator, it immediately crashes. The Xcode Debug area displays a fatal error:
Unexpectedly found nil while unwrapping an Optional value.The developer needs to identify the exact line of code and trace the sequence of function calls that led to this crash. Which specific navigator in Xcode should the developer use to view the call stack?
Show answer details
Correct answer: C
The Debug Navigator displays the call stack (the sequence of method calls) that led to the current paused state or crash. This allows the developer to trace back from the exact point of failure to see which functions initiated the faulty process.
sequenceDiagram participant OS as iOS System participant VC as MainView participant Net as NetworkManager OS->>VC: onAppear() VC->>Net: fetchWeatherData() Net-->>VC: return nil VC->>VC: force unwrap (!) -> CRASH - 2
To monitor a specific variable and instruct Xcode to automatically pause program execution whenever the value of that variable changes, a developer should configure a:
Show answer details
Correct answer: B
A watchpoint is a specialized debugging tool that pauses execution anytime the value of a specific variable or memory address is modified. It is highly useful for tracking down unexpected state changes without needing to place breakpoints on every line that accesses the variable.
- 3
Given the following Swift code:
let maxRetries = 3How does the Swift compiler determine the data type of the
maxRetriesconstant without an explicit type declaration?Show answer details
Correct answer: B
Swift uses type inference to automatically deduce the type of a variable or constant based on the initial value assigned to it. Since 3 is an integer literal, Swift infers that
maxRetriesis of typeInt. - 4
A developer is building a new SwiftUI application and wants to change the font weight and text color of a
Textview without manually writing the code modifiers. Which area of the Xcode interface is specifically designed to allow visual modification of these properties?Show answer details
Correct answer: B
The Attributes Inspector (located in the right panel of Xcode) allows developers to visually configure properties like font, color, and alignment for a selected UI element. Changes made here automatically generate the corresponding SwiftUI modifier code.
- 5
During the development of an iOS application, a developer encounters build errors and needs to review the specific compiler warnings. Which TWO of the following tasks can be accomplished using the Navigators located in the left pane of the Xcode workspace? (Select TWO)
Show answer details
Correct answer: A, B
The Project Navigator allows you to view and manage all files and folders in your project hierarchy.
The Issue Navigator displays a list of all current errors, warnings, and static analyzer messages generated during the build process.
- 6
While writing Swift code, a developer wants to quickly read the official Apple documentation for a specific method directly in a pop-up window over the source code. To do this, the developer should hold down the _____ key and click on the method name.
Show answer details
Correct answer: C
Holding the Option key and clicking a symbol in Xcode brings up the Quick Help pop-up, which displays a summary of the documentation, parameters, and return types without leaving the Source Editor.
