Essential iOS Interview Questions from RocketSkill Application

Interview Questions for getting you ready for your interview A small guide to help those looking to hire a developerfor iOS. A great self-test if you're looking to keep current or practice for your own interview. All you need to know about iOS technical interview including some tips for preparing, questions and some coding exercises

iOS domains

We have organized the questions to better address each focus point.

swift
Objective-C
Basic Classes
Geolocalisation
Notification
Algorithms
Plateform
Memory Management
Battery Management
Network
Security
Tools
Internationalization-Localization
Design Pattern
Data Storage
AppStore
watchOS
tvOS
SwiftUI
Graphic
iOS13

Swift

Who is the Swift creator?
What is the difference between unowned and weak variables?
How is manager memory in a Swift program?
What is the Optional Binding?
What is Swift Optional?
What is a typealias?
What is tuple?
When to use guard?
What problems can be solved using Generics?

Objective-C

Why do we use @synchronized?
What is protocol in Objective-C?
How do you declare an informal protocol?
How do we check that Optional methods are implemented at Runtime?
What are accessor methods?
Advantages of categories?
KVC declaration, usage?

Basic Classes

I need a webView in my app, which class should i use?
NS_DESIGNATED_INITIALIZER?
What is the size and precision of CGFloat?
UITableView, estimatedRowHeight
UITableViewController
What is Self-Sizing Table View Cells?
A cell of a TableView must be of what type?
UIStackView usage and available since?
UICollectionView usage and available since?
UIAlertView usage
UIAlertViewController usage
Any VS Anyobject
Category/Extension VS Protocol
Category/Extension VS Inheritance
Category/Extension VS Inheritance
NSSet VS NSArray
NSDictionary VS NSMutableArray
Bound VS Frame

Memory Management

How it's works?
ARC
weak
strong
Unowned
Swift structures
Swift classes
Retain cycle problems, analysis, solutions?
Delegation, property attributes
Low memory, problems, analysis, solutions?

Notification

Payload
Invisible Notif
Background execution
Notification Service Extension
Notification Content Extension

Algorithms

What are algorithms?
Why learn algorithms?
This algorithm is O(n)." What that means?
Complexity n, logN, n2
Recursive algorithm

Plateform

AutoLayout / Auto resizing masks
Xcode 11, targetable OS versions?
IBInspectable
IBDesignable

Architectures

armV7
armV7s
arm64
arm64, binary size ? in memory size?

Threading

How to perform multitasking?
GCD
DispatchQueue
BackgroundTasks
MainThread
MainThread / MainQueue ?
Other Thread / Queue?
Queue priorities?
How to perform multitasking?

Battery Management

BackgroundTasks
Analysis

Geolocalisation

Significant Change
Geofencing
Background

App Packaging

@1x, @2x, @3x
On-Demand Resources
Bitcode
What is a .dSYM file?
App Thinning
Storyboard
XIB
XIB vs NIB
NSLocalizedString

Network

NSURLRequest
Alamofire
OAuth/OAuth2

Security

http / https / TLS
App Transport Security
CodeSign
Touch ID
Face ID
UDID
TLS
.ipa
.ipsw
keychain
AppGroups

Tools

xcode-select
Lottie
Testflight
Carthage
SwiftPacketManager
Cocoapods
SonarQube
SwiftLint
Fabric
Firebase

Internationalization / Localization

Primary language on iTunesConnect
DateFormatter
Plural forms / languages?
.stringsdict
Internationalization Vs Localization

Design Pattern

What is a design pattern?
MVC
Singleton
Delegation
MVP
MVVM
Decorator
Observer Pattern
VIPER
Binding
Rx

Data Storage

UserDefault
App-sandboxing, what's that means?
keychain
NSCoding
CoreData
Realm

AppStore

bundle ID
Screenshots sizes?
4-Inch Retina Display
4.7-Inch Retina Display
5.8-Inch Super Retina Display
App Size
App download limit size
Localization description?
Keywords limits?
Forbidden words?

watchOS

IN PROGRESS

tvOS