Quest Global Senior iOS Engineer Interview Questions and Answers

Q1. Explain MVVM and its pros/cons
Ans. 
MVVM is a design pattern that separates the UI, business logic, and data layers in an iOS application.
• Model: Represents the data and business logic of the application.

• View: Represents the UI components of the application.

• ViewModel: Acts as a mediator between the Model and View, handling the presentation logic and data binding.

• Pros: Separation of concerns, easier to maintain and test, promotes reusability.

• Cons: Increase...read more
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Q2. Multithreading in swift
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Multithreading in Swift allows for concurrent execution of tasks to improve performance and responsiveness.
• Use Grand Central Dispatch (GCD) for managing concurrent tasks

• Avoid blocking the main thread to prevent UI freezes

• Consider using Operation and OperationQueue for more complex task management
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Q1. Auto closures and Escaping closures
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Q2. Cardinality and string reverse coding
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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. Based on the position
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Q1. About previous experience
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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. Japanese reading and introduce
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Q2. Kanji reading and meaning
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Kanji is a system of Japanese writing using Chinese characters. Each character has a reading and meaning.
• Kanji characters are used in combination with hiragana and katakana to write Japanese.

• There are over 2,000 commonly used kanji characters.

• Each kanji character has at least one reading and one meaning, but some have multiple readings and meanings.

• For example, the kanji character for 'tree' can be read as 'ki' or 'mok
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Q1. What is Protocol in swift?
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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 provide a way to define common behavior across different types.

• A type can adopt multiple protocols, enabling it to conform to multiple sets of rules.

• Protocols can require propert...read more
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Q2. What is Dependency Injection.?
Ans. 
Dependency Injection is a design pattern where the dependencies of an object are provided externally rather than being created internally.
• Dependency Injection helps in achieving loose coupling between classes.

• It allows for easier testing and maintenance of code.

• There are three types of Dependency Injection: Constructor Injection, Setter Injection, and Interface Injection.

• Example: In iOS development, we can use Dependen...read more
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Q3. What is Generics in swift.?
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Generics in Swift allow you to write flexible and reusable code by creating functions, classes, and structures that can work with any type.
• Generics enable you to write code that can be used with different types, without duplicating code.

• You can define generic functions, types, and protocols to work with a wide range of types.

• Generics are particularly useful when working with collections, such as arrays and dictionaries...read more
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Q4. What is Associate types ?
Ans. 
Associate types are a way to create a relationship between two types in Swift.
• Associate types are defined using the 'associatedtype' keyword.

• They are used in protocols to define a placeholder type that will be specified by the conforming type.

• The conforming type can provide its own concrete type for the associated type.

• This allows protocols to be more flexible and reusable.

• For example, a protocol for a container type c...read more
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