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iOSwiftResources Algorithms Components Snippets 🚧 Deep Dives (WIP)🚀 Interview Questions

All questions

ExplainAbstractFactoryPattern
Explain the Decorator Pattern in iOS
How to Securely Store Passwords in a Database
Explain the Adapter Pattern in iOS
Explain the Builder Pattern in iOS
Explain the Chain of Responsibility Pattern in iOS
Explain the Command Pattern in iOS
Explain the Composite Pattern in iOS
Explain the Coordinator Pattern in iOS
Explain the Delegation Pattern in iOS
Explain the Facade Pattern in iOS
Explain the Factory Pattern in iOS
Explain the Flyweight Pattern in iOS
Explain the Iterator Pattern in iOS
Explain the MVVM Pattern in iOS
Explain the Mediator Pattern in iOS
Explain the Memento Pattern in iOS
Explain the Multicast Delegate Pattern in iOS
Explain the Observer Pattern in iOS
Explain the Prototype Pattern in iOS
Explain Singleton Pattern in iOS
Explain the State Pattern in iOS
Explain Strategy Pattern in iOS
Explain the Coordinator Pattern and Its Benefits
Git Flow vs. Trunk-Based Development
Explain Model-View-Controller (MVC) Pattern in iOS
How can we handle changes in our application’s lifecycle state? (SwiftUI)
How can we handle changes in our application’s lifecycle state? (UIKit)
💡 About Interview Questions
Are closures value or reference types?
Can we use Swift’s reserved keywords as variable or constant names?
Can you explain the different quality of service options GCD provides?
Can you explain what the @objc keyword does?
Do all elements in a tuple need to be the same type?
Does Swift support implicit casting between data types?
How are Content Hugging and Content Compression Resistance different?
How are Optionals implemented?
How can we group multiple asynchronous tasks together?
How can we limit a protocol conformance to a specific class or type?
How can we prevent race conditions [the reader-writer problem]?
How can you cancel a running asynchronous task?
How can you create a method with default values for its parameters?
How do we provide default implementations for protocol methods?
How do you create interoperability between Objective-C and Swift?
How do you use the Result type?
How does code signing work?
How would we test the performance of a method in our tests?
How would you animate a view that has a constraint?
How would you avoid retain cycles in a closure?
How would you debug view layout issues?
How would you limit a function or a class to a specific iOS version?
Is an enum a value type or a reference type?
Is Swift a statically-typed language?
On what thread should all UI updates be made?
What are compilation conditions?
What are generics and what problem do they solve?
What are layer objects?
What are our options for storage and persistence?
What are our options for unwrapping optionals in Swift?
What are some of the main advantages of Swift over Objective-C?
What are Swift’s different assertion options?
What are the differences between a class and a struct?
What are the differences between a delegate and a notification?
What are the differences between a library and a framework?
What are the differences between a .xib and a .storyboard file?
What are the differences between DispatchQueue, Operation, and Threads?
What are the differences between Keychain and UserDefaults?
What are the differences between Swift’s access control modifiers?
What are the differences between the static and class keywords?
What are the different execution states your application can be in?
What are the different URLSessionConfiguration options?
What are the higher order functions in Swift?
What are the purposes of setUp() and tearDown() in the XCTest framework?
What are the stages in a UIViewController’s view lifecycle?
What are UI tests?
What common problem does the Main Thread Checker help detect?
What do the Comparable, Equatable, and Hashable protocols do?
What does a deinitializer do?
What does an unwind segue do?
What does app thinning mean?
What does App Transport Security do?
What does Arrange, Act, and Assert mean with respect to unit tests?
What does copy on write mean?
What does deadlock mean?
What does defer do?
What does it mean for something to be thread safe?
What does it mean to be a first class function or type?
What does layoutSubviews() do?
What does setNeedsDisplay() do?
What does the associatedtype keyword do?
What does the CaseIterable protocol do?
What does the CodingKey protocol allow you to do?
What does the File’s Owner do?
What does the final keyword do?
What does the lazy keyword do?
What does the mutating keyword do?
What does the nil coalescing operator do?
What does the rethrows keyword do?
What does the typealias keyword do?
What does viewDidLayoutSubviews() do?
What features of Swift do you like or dislike?
What is a memory leak?
What is a placeholder constraint?
What is a race condition?
What is a raw value in an enum?
What is a unit test?
What is a view’s intrinsic content size?
What is a .dSYM file?
What is an anonymous function?
What is an associated value?
What is an inout parameter?
What is automatic reference counting?
What is Behavior Driven Development?
What is code coverage?
What is Dynamic Type in iOS?
What is operator overloading?
What is optional chaining?
What is protocol composition? How does it relate to Codable?
What is Snapshot Testing?
What is Test Driven Development?
What is the difference between a dynamic library and a static library?
What is the difference between a point and a pixel?
What is the difference between a serial and a concurrent queue?
What is the difference between Any and AnyObject?
What is the difference between bounds and frame?
What is the difference between == and ===?
What is the difference between is, as, as?, and as!?
What is the difference between layoutIfNeeded() and setNeedsLayout()?
What is the difference between layout margins and directional layout margins?
What is the difference between pushing and presenting a new view?
What is the difference between static and dynamic dispatch?
What is the difference between strong, weak, and unowned?
What is the difference between the App ID and the Bundle ID?
What is the difference between the designated and convenience initializer?
What is the difference between the stack and the heap?
What is the difference between the UIApplicationDelegate and SceneDelegate?
What is the difference between try, try!, and try??
What is the purpose of the reuseIdentifier?
What is the Responder Chain?
What is type inference?
What is your preferred way of creating views?
What methods are required to display data in a UITableView?
What would happen if a struct had a reference type in it?
What's the difference between Self vs self?
When would you use a struct versus a class?
While iterating through an array, how can we get both the value and the index?
Your app is crashing in production. What do you do?
What are trailing closures?
What is the difference between an escaping closure and a non-escaping closure?

Tags

C

Concurrency10

D

Design Patterns23

G

General38

I

iOS2

M

Memory Management4

S

Security1
Swift44
swiftui1

T

Testing7

U

UIKit19