Top 20 Swift Interview Questions and Answers

Swift is a programming language developed by Apple for iOS, macOS, watchOS, and tvOS development.

• Swift is a statically typed language.

• It is designed to be safe, fast, and interactive.

• Swift is used to develop iOS apps, macOS apps, watchOS apps, and tv...read more

SWIFT stands for Society for Worldwide Interbank Financial Telecommunication. It is a messaging network used by banks to securely communicate financial transactions.

• SWIFT is a global financial messaging network used by banks to send and receive infor...read more

Swift is a modern, fast, and safe programming language developed by Apple, while Objective-C is an older, more verbose language.

• Swift is more concise and easier to read than Objective-C.

• Swift supports optionals and type inference, making code safer a...read more

Weak references allow deallocation; unowned references assume the object exists and do not allow nil.

• Weak references can become nil if the object they reference is deallocated.

• Unowned references do not become nil; they assume the referenced object wi...read more

Yes, I am comfortable working with SWIFT and have experience in transaction processing and quality analysis.

• Familiar with SWIFT messaging standards and formats, such as MT103 and MT202.

• Experience in processing international transactions using SWIFT, ...read more

Access modifiers in Swift are keywords that control the visibility and accessibility of classes, methods, properties, and other entities.

• Access modifiers include public, internal, fileprivate, and private.

• Public allows entities to be accessed from an...read more

Swift programming offers fast performance, safety, and interoperability with Objective-C.

• Fast performance due to being compiled language

• Safety features like optionals and type interference

• Interoperability with Objective-C for using existing code and ...read more

Table view in Swift is used to display data in a scrollable list format.

• Table views are commonly used in iOS development to display lists of data.

• They can be customized with different cell types and layouts.

• Table views use data sources and delegates ...read more

lazy var is used to delay the initialization of a property until it is accessed for the first time.

• Used to improve performance by delaying initialization until necessary

• Helps reduce memory usage by only initializing when needed

• Commonly used for prope...read more

Steps to add collection view in Swift.

• Create a UICollectionView instance

• Set the delegate and data source of the collection view

• Implement the required methods of UICollectionViewDataSource and UICollectionViewDelegate protocols

• Register the cell class ...read more

MT103 is a payment message used for international funds transfer, while MT202 is a financial institution transfer message.

• MT103 is used for customer payments, while MT202 is used for financial institution transfers.

• MT103 contains details of the sende...read more

Swift is a programming language developed by Apple for iOS, macOS, watchOS, and tvOS development.

• Developed by Apple

• Used for iOS, macOS, watchOS, and tvOS development

• Modern, fast, and safe language

Settlement SWIFTS are messages used in the financial industry to facilitate international money transfers.

• SWIFT stands for Society for Worldwide Interbank Financial Telecommunication

• Settlement SWIFTS are used to communicate payment instructions betwe...read more

Autoclosure is a feature in Swift that automatically wraps an expression in a closure.

• Autoclosure is used to delay evaluation of an expression until it is actually needed.

• It is commonly used with functions that take closures as arguments, allowing th...read more

Mandatory fields in Swift MT 103 message

• Sender's Reference (20)

• Sender's Account Number (50K)

• Receiver's Account Number (59)

• Amount (32A)

• Currency (33B)

• Value Date (32A)

• Sender's Correspondent (53A)

• Receiver's Correspondent (54A)

Option values in Swift can be handled using enums, switch statements, and optional binding.

• Use enums to define a set of possible values for an option

• Use switch statements to handle each possible value of the option

• Use optional binding to safely unwra...read more

SwiftUI is a user interface toolkit introduced by Apple for building apps across all Apple platforms using Swift programming language.

• Declarative syntax for building user interfaces

• Works seamlessly with Swift code

• Supports dynamic type, dark mode, loc...read more

Protocols in Swift define a blueprint of methods, properties, and other requirements that a class, struct, or enum must adopt.

• Protocols are used to define a set of rules or capabilities that a type must conform to.

• They allow for code reuse and provid...read more

Optionals in Swift are used to represent a value that may or may not exist.

• Optionals are denoted by adding a question mark (?) after the type declaration.

• They can either contain a value or be nil.

• Optionals must be unwrapped before using their value t...read more

Swift 5 introduced ABI stability, improved performance, and new language features.

• ABI stability ensures compatibility between future Swift versions

• Improved performance with faster build times and reduced app size

• New language features include Result t...read more

Use guard let statement to safely unwrap optional values and handle nil cases.

• Use guard let to check if an optional value is nil before using it.

• It is commonly used to unwrap optionals in the beginning of a function.

• If the optional value is nil, the ...read more

Swift 5.5 introduces async/await, structured concurrency, actors, and improved interoperability with Objective-C.

• Async/await allows for easier asynchronous programming by simplifying the syntax.

• Structured concurrency helps manage concurrent tasks mor...read more