FISSION TECHNO SOLUTIONS IOS Developer Interview Questions and Answers

Q1. What is optional, difference between struct and class?
Ans. 
Optional is a type in Swift that can hold a value or be nil. Struct and class are both used to define custom data types.
• Optional is denoted by a question mark (?) and is used to handle nil values.

• Structs are value types and are passed by value, while classes are reference types and are passed by reference.

• Structs have a default memberwise initializer, while classes do not.

• Classes can inherit from other classes, while s...read more
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Q1. Basic iOS questions , Closures,Protocol,Optional,Auto layouts.
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Q1. I interned here in my second-year summer. I got selected on the basis of resume shortlisting.
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Q2. There was no technical round
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Find second greatest number from an array of duplicate items.

Q1. Arc in swift...
Ans. 
ARC (Automatic Reference Counting) in Swift is a memory management system used to automatically manage memory allocation and deallocation.
• ARC keeps track of how many references there are to an object and automatically deallocates it when there are no more references.

• Use strong reference cycles can lead to memory leaks, so use weak or unowned references to break the cycle.

• ARC is the default memory management system in S...read more
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Q2. Automstic referenc counting
Ans. 
Automatic Reference Counting (ARC) manages memory in iOS apps, ensuring efficient resource use and preventing memory leaks.
• ARC automatically tracks and manages the app's memory usage.

• Objects are deallocated when there are no strong references to them.

• Use 'weak' references to avoid retain cycles, e.g., delegate properties.

• Example: 'var delegate: MyDelegate?' is a weak reference.

• ARC simplifies memory management compared ...read more
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Q1. Mvvm in swift....
Ans. 
MVVM (Model-View-ViewModel) is an architectural design pattern commonly used in iOS development to separate concerns and improve code maintainability.
• MVVM separates the user interface (View) from the business logic (ViewModel) and data (Model).

• ViewModel acts as an intermediary between the View and the Model, handling user interactions and updating the data.

• Swift provides tools like Combine framework for reactive progra...read more
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Q2. Model view viewmodel
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Q1. Diff b/w diff and guard
Ans. 
diff is used to compare two collections and return the differences, while guard is used for early exit in a function if a condition is not met.
• diff is a method used in Swift to compare two collections and return the differences.

• guard is a keyword used in Swift to provide an early exit from a function if a condition is not met.

• Example: let array1 = [1, 2, 3, 4], array2 = [3, 4, 5, 6]; let result = array1.diff(array2) //...read more
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Q2. What is GCD and Multitreadung
Ans. 
GCD stands for Grand Central Dispatch, a technology used in iOS for managing concurrent operations. Multithreading is the ability of a CPU to execute multiple threads concurrently.
• GCD is used for managing tasks asynchronously and efficiently utilizing system resources.

• Multithreading allows multiple tasks to run concurrently, improving performance and responsiveness of an application.

• Example: Using GCD to download image...read more
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Q1. What is closure? Life cycle of escaping closure?
Ans. 
A closure is a self-contained block of code that can be passed around and used in your code. An escaping closure is a closure that is called after the function it was passed to has returned.
• Closure is a block of code that can be passed around and used in your code.

• Escaping closure is called after the function it was passed to has returned.

• Example: Using a completion handler in a network request to handle the response a...read more
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Q2. What is multi threading?
Ans. 
Multi threading is the ability of a CPU to execute multiple threads concurrently, allowing for improved performance and responsiveness in applications.
• Allows for parallel execution of tasks, improving performance

• Enables applications to remain responsive while performing intensive tasks

• Can lead to synchronization issues if not managed properly
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