Swift Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is Swift?
Swift is a programming language developed by Apple for iOS, macOS, watchOS, tvOS, and Linux applications.
Ques 2. Explain optionals in Swift.
Optionals are a type in Swift that represents either a wrapped value or nil, indicating the absence of a value.
Ques 3. What is the difference between 'let' and 'var' in Swift?
'let' is used to declare constants, and 'var' is used to declare variables.
Ques 4. What is a closure in Swift?
A closure is a self-contained block of functionality that can be passed around and used in your code.
Ques 5. What are property observers in Swift?
Property observers are used to observe and respond to changes in a property's value, providing a way to execute code before or after the value changes.
Ques 6. What is the purpose of the 'static' keyword in Swift?
The 'static' keyword in Swift is used to define type-level properties and methods that are associated with the type itself, rather than an instance of the type.
Ques 7. What is the Swift Package Manager (SPM) used for?
Swift Package Manager is a tool for managing the distribution of Swift code as source or binary packages.
Ques 8. What is the purpose of the 'DispatchQueue' class in Swift?
'DispatchQueue' is used for managing the execution of tasks serially or concurrently in a multithreaded environment.
Ques 9. What is the purpose of the 'self' keyword in Swift?
'self' is used to refer to the instance of the current type, and it's often required to distinguish between instance variables and parameters with the same name.
Ques 10. What is the 'lazy' keyword used for in Swift?
'lazy' is used to delay the initialization of a property until it's accessed for the first time.
Ques 11. Explain the difference between 'frame' and 'bounds' in UIKit.
'frame' represents a view's location and size in its superview's coordinate system, while 'bounds' represents a view's location and size in its own coordinate system.
Ques 12. What is the purpose of the 'throws' keyword in Swift?
'throws' is used to indicate that a function can potentially throw an error, and it must be marked with 'try' when called.
Ques 13. Explain the role of the 'UIApplicationDelegate' in a Swift app.
The 'UIApplicationDelegate' is a protocol in Swift that defines methods for handling app lifecycle events, such as app launch, termination, and background execution.
Ques 14. What is a typealias in Swift, and when would you use it?
A typealias is used to create a named alias for an existing type. It is useful for making code more readable and for simplifying complex type declarations.
Most helpful rated by users:
- What is Swift?
- Explain optionals in Swift.
- What is the difference between 'let' and 'var' in Swift?
- What are property observers in Swift?
- What is the purpose of the 'static' keyword in Swift?
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