Techwin Labs IOS Developer Interview Questions and Answers

One coding question basic DSA related

Q1. Difference betweenClass And Struct
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same memory location when assigned to a new variable.

• Structs are value types, meaning they create a new copy when assigned to a new variable.

• Classes support inheritance, while structs do not.

• Classes can have deinitializers, while structs cannot.

• Classes can be typecasted, while structs cannot.
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Q2. Static Key work
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Find the index of the first occurrence in string

Q1. Salary Expectation
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Q2. Any leave plans in next six months
Ans. 
Yes, I have planned a vacation in the next six months.
• I have scheduled a week-long trip to Europe in September.

• I also plan to take a few days off around Christmas to visit family.

• I have informed my team in advance and ensured that my work will not be affected.
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Complex Question are there like images patter and we have to predict next image

There are two task for coding. both are easy.

Q1. Lifecycle method, polyfills, performance, optimisation
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Q2. New architecture, design patterns
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Q1. 1.What is the difference between atomic and nonatomic properties. 2.How do you handle memory management in Swift. 3.Difference between classes and struct in Swift. 4. What is Factorial Pattern.
Ans. 
1. Atomic properties ensure that the value is always fully retrieved or set, while nonatomic properties do not guarantee this. 2. Memory management in Swift is handled automatically using Automatic Reference Counting (ARC). 3. Classes are reference types, while structs are value types in Swift. 4. Factorial pattern is a design pattern used to calculate the factorial of a number.
• Atomic properties ensure thread safety by...read more
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Q1. What is debouncing technique in swift. what is factorial pattern in swift what is dispatch_wait. Explain bluethooth in iOS. Explain InAppPurchases in iOS.
Ans. 
Debouncing technique in Swift is used to limit the rate at which a function is called, preventing it from being called multiple times in a short period.
• Debouncing involves setting a time threshold and only allowing the function to be called after that threshold has passed without any new calls.

• It is commonly used in scenarios like search bars or buttons to prevent rapid firing of events.

• Example: Implementing a search f...read more
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Q1. Core Android Kotlin
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Q2. DSA - with time complexity and space complexity
Ans. 
Data Structures and Algorithms with time and space complexity analysis
• Discuss various data structures like arrays, linked lists, trees, graphs, etc.

• Explain common algorithms like sorting, searching, dynamic programming, etc.

• Analyze time complexity using Big O notation and space complexity using memory usage

• Provide examples of code snippets with their corresponding time and space complexities
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Q1. Client round - Project related questions
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Q1. Salari discussions
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Q1. Explain about protocol extensions
Ans. 
Protocol extensions in iOS allow adding functionality to existing protocols without modifying the original protocol definition.
• Protocol extensions can provide default implementations for protocol methods.

• They can also add new methods and properties to conforming types.

• Protocol extensions are useful for adding common functionality to multiple types that conform to a protocol.

• Example: extending the Equatable protocol to ...read more
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Q2. Difference between merge and rebase
Ans. 
Merge combines changes from different branches, while rebase moves the entire branch to a new base commit.
• Merge creates a new commit to combine changes, while rebase rewrites commit history.

• Merge preserves the commit history of all branches, while rebase creates a linear history.

• Merge is non-destructive and keeps the original branch intact, while rebase modifies the branch being rebased.

• Example: 'git merge feature-bran
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Q3. Explain about Protocol equitability
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Protocol equitability ensures that all participants in a communication protocol have equal access and opportunity to send and receive data.
• Ensures fair and equal treatment of all participants in a communication protocol

• Prevents any participant from having an unfair advantage or disadvantage

• Promotes transparency and inclusivity in communication protocols
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