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Hey to all the mobile community! Since 2016 we have been curating Flawless iOS, a community-driven blog about iOS development. So far it's the biggest iOS blog on Medium with both beginner and advanced iOS guides, written by fellow developers. Updated almost every day.

We're proud to have more than 80 writers and 200+ free iOS guides published within Flawless iOS Medium blog. In this repo you can find all of them, nicely categorized. Learn from these comprehensive guides, share your articles with us and follow Flawless iOS publication on Medium.

Table of Content

• Architecture
  • MVC
  • MVVM
  • Modular Architecture
  • Viper
• Auto Layout
• Closures
• CocoaPods
• Combine
• Concurrency
• Continuous Integration & Continuous Delivery
• Curation
• Data Structure
• Debugging
• Deep Dive
• Dependency Injection
• Design System
• Flawless App
• Flutter
• Frameworks
• Git
• How to Implement an App: Case-Studies
• Image
• Implementing Animations in iOS
• Implementing Integrations
• iOS
  • iOS 11
  • iOS 12
  • iOS 13
• iOS Simulator
• iPadOS
• JSON Parsing
• Localisation
• Machine Learning in iOS
• Making Xcode Work Better for You
• Memory Management
• Navigation
• Patterns
• Playgrround
• Protocols
• Push Notifications
• RxSwift
• Siri
• Soft Skills
• Sourcery
• Speeding up workflow & productivity tips
• Storyboards
• Swift
• SwiftUI
• Testing
• Texture
• Tutorial
• UIKit
• URLs
• UX & UI design for mobile developers
• White Label Solutions
• Writing Better Code
• 3D Touch

Architecture

• The only viable iOS architecture by Amirzhan Idryshev

MVC+

• “Massive” View Controllers or bad coding style? by Besar
• Judging MVC by Amr Salma

MVVM

• How not to get desperate with MVVM implementation by S.T.Huang
• A taste of MVVM and Reactive paradigm by Khoa Pham
• Advanced iOS tutorial on MVVM by S.T.Huang
• Applying Unit Tests to MVVM with Swift by S.T.Huang
• Practical MVVM + RxSwift by Mohammad Zakizadeh
• Fighting state redundancy in MVVM by Alexey Naumov

Modular Architecture

• Modular Architecture in iOS by Leandro Pérez
• Speed Up your iOS Development: The Modules’s Paradigm by Francisco Javier Trujillo Mata

Viper

• Implementing VIPER Architecture Pattern for iOS by Mahdi Chtioui
• App Architecture and Object Composition in Swift by Dmytro Anokhin

Auto Layout

• How to make Auto Layout more convenient in iOS by Khoa Pham

Closures

• Simplifying communication patterns with closure in Swift by Khoa Pham
• You don’t (always) need [weak self] by Besher Al Maleh
• Closure in Swift: The Painful one! by Shubham Bakshi
• Unowned vs Weak by Fahad C H

CocoaPods

• Create your own CocoaPods library by Yong Su

Combine

• Problem Solving with Combine Swift by Arlind Aliu
• Will Combine kill RxSwift? by MortyMerr
• Visualize Combine Magic with SwiftUI Part 1 by Kevin Cheng
• Visualize Combine Magic with SwiftUI Part 3 by Kevin Cheng
• Visualize Combine Magic with SwiftUI Part 5 by Kevin Cheng
• Building smart Q&A app with CoreML, SwiftUI, and Combine by Martin Mitrevski
• How to create custom Publisher in Combine by Dmitry Lupich

Concurrency

• Parallel Programming with Swift: What could possibly go wrong? by Jan Olbrich
• Parallel programming with Swift: Basics by Jan Olbrich
• Parallel programming with Swift: Operations by Jan Olbrich
• Parallel programming with Swift: Promises by Jan Olbrich
• Multithreaded Programming in iOS by Medi Assumani
• GPU Speedup by Mohammad Jeragh

Continuous Integration & Continuous Delivery

• How to set up your iOS project with Continuous Integration and Delivery by Lawrence Tan
• How to set up GitLab Continuous Integration for iOS projects without a hassle by Victor Peschenkov
• Build it, Test it, Deliver it! Complete iOS Guide on Continuous Delivery with fastlane and Jenkins by S.T.Huang
• Automate your iOS apps using Bitrise by Gokhan Gultekin
• Continuous Integration for Flutter with Codemagic by Codemagic
• iOS Continuous Integration with GitLab CI, Fastlane & OTA Installation by Leszek Szary
• Secret variables in Xcode AND your CI for fun and profit by Robin Malhotra

Curation

• Awesome Ladies iOS Engineers to Follow on Twitter by Lisa Dziuba
• 15 great iOS newsletters you should know about by Lisa Dziuba
• 33 awesome GitHub lists for iOS development by Lisa Dziuba
• Best resources for Advanced iOS Developer (Swift) by Pavlo Shadov

Data Structure

• Doubly Linked Lists — Swift 4 by Sarin Swift
• Error trees in iOS by Isaac Carol Weisberg

Debugging

• Advanced debugging with Xcode by Vincent Pradeilles
• Bringing awesome logs to your iOS app by Vincent Pradeilles

Deep Dive

• IPC — Mach Message by Ali Pourhadi

Dependency Injection

• iOS Dependency Injection Using Swinject by Ali Akhtar

Design System

• What Design Language System looks from the engineers’ side? by Sting.Su

Flawless App

• How Flawless App will make you a better UI designer by Ahmed Sulaiman
• Flawless App update: redesigned UI and UX, dark mode and optimised file selection by Flawless App

Flutter

• Flutter vs React Native: A Developer’s Perspective by Codemagic
• Flutter: TDD with Unit Tests by Lawrence Tan

Frameworks

• Getting Started with Reusable Frameworks for iOS Development by Alec O'Connor
• Improve your iOS team’s productivity by building features as frameworks by Alexander Freas

Git

• Useful git commands for everyday use! by Khoa Pham

How to Implement an App: Case-Studies

• A Christmas Challenge — A Cinema app in just 7 days by James Sherlock
• How I created Apple’s Voice Memos clone by Hassan El Desouky
• Creating Game of Life on iOS by Arlind Aliu
• How you can build a private photo-sharing app in 30 minutes with Creo by Massimo Sgrelli
• Implementing Foldable, Map and FlatMap by Tyrone Michael Avnit
• Building Movie Trailer App Using SwiftUI by Shankar Madeshvaran

Image

• Image Cropping in Swift by Ashok Kumar

Implementing Animations in iOS

• Delightful animations in iOS by Roland Leth
• Using Sky Segmentation to create stunning background animations in iOS by Eric Hsiao
• Cool Custom ViewController Transitions — Easy by Fran Obarrio
• Cool Custom ViewController Transitions — Advanced by Fran Obarrio
• Animated gradient layers in Swift by Prabhu S
• RxAnimated — animated bindings by Stfalcon.com

Implementing Integrations

• Facebook Account Kit using Swift by Anas Zaheer
• Unity Integration in Native iOS & APIs by Azeem Azeez
• Scratching the Firebase services with your iOS app by Deyan Aleksandrov
• Managing your App Distribution with Firebase by Nabil Kazi

iOS

iOS 11

• Sneak peek into iOS 11 Drag & Drop API using Swift by Yuri Chukhlib

iOS 12

• All about iOS 12 Autofill Passwords Tool API’s by Ali Akhtar

iOS 13

• How To Prepare Your App For iOS 13 by Attia Mo
• A “Swifty” way to pick Documents by Abraham Mangona
• iOS 13 UISegmentedControl: 3 important changes by Rostyslav Dovhaliuk
• How to Request Device Motion and Orientation Permission in iOS 13 by Lee Martin
• How to use a full-text search on iOS? by Pavle Pesic
• Handling iOS 13 Bluetooth Permissions by Anupam Chugh
• Backward compatible Dark Mode on iOS by Maksym Shcheglov
• Enable Accessibility VoiceOver for ImageView in iOS 13 on Xcode with Swift by Mumtaz Hussain
• Implementing Dark Mode on iOS by Bao Nguyen
• Getting started with PencilKit on iOS 13 by Martin Mitrevski
• iOS 13: Optical Character Recognition by Chris Mash
• Upgrade the UI with iOS 13 by Takuma Kakehi

iOS Simulator

• iOS Simulator on steroids: Tips & Tricks by Ahmed Sulaiman

iPadOS

• Multi-window development in iPadOS by Chris Mash
• Using native Apple’s Places by Andrew Konovalskyi

JSON Parsing

• Let’s parse the JSON like a Boss with Swift Codable protocol by Shakti Prakash

Localisation

• DRY String Localization with Interface Builder by Victor Pavlychko

Machine Learning in iOS

• iOS Vision And Highlighting Text With Core ML by Anupam Chugh
• Machine Learning in iOS: IBM Watson and CoreML by Khoa Pham
• Machine Learning in iOS: Azure Custom Vision and CoreML by Khoa Pham
• Machine Learning in iOS: Turi Create and CoreML by Khoa Pham
• Vision in iOS: Text detection and Tesseract recognition by Khoa Pham

Making Xcode Work Better for You

• Become more productive and efficient in Xcode by Farhan Syed
• One-Stop Xcode Coziness by Wendy Liga
• Optimize Swift build and compile times in Xcode by Batikan
• Improve your Xcode (Swift) Compile Time by Alexandros Smponias
• Essential Xcode Shortcuts for More Efficient Coding by Peter Friese
• Xcode 11 now makes “//MARK:” comments a lot more useful with Minimap feature by Mumtaz Hussain
• 7 Useful Tips and Tricks for Xcode by Göktuğ Gümüş

Memory Management

• Memory Leaks in Swift by Leandro Pérez
• iOS Memory Management in Under 6 Minutes by Hassan El Desouky
• Reducing Memory Footprint and OOM Terminations in iOS by Leandro Pérez

Navigation

• Creating a UITabBarController Framework by Malcolm Kumwenda

Patterns

• Returning Error vs Throwing Error in Swift by Lau Kwok Ping
• Strategy pattern in Swift by Juanpe Catalán
• Flow coordinator pattern on steroids by Pavle Pesic
• An elegant pattern to craft cache-efficient functions in Swift by Vincent Pradeilles
• Design patterns by Tutorials— The power of OOP (part 1) by Hitendra Solanki
• Design patterns by Tutorials — The power of OOP (part 3) by Hitendra Solanki
• Builder Design Pattern in iOS by Oguz Parlak

Playgrround

• Playground driven development in Swift by Khoa Pham

Protocols

• Writing a Network Layer in Swift: Protocol-Oriented Approach by Malcolm Kumwenda
• Improving code testability with Swift protocols by Juanpe Catalán
• Protocol-based Themes in iOS Apps by Muhammad Nayab Butt

Push Notifications

• iOS remote push notifications in a nutshell by Deyan Aleksandrov
• Strong-typed Notifications in Swift by Leandro Pérez
• iOS Dynamic Push Notifications with AWS Pinpoint by Marvin Mouroum
• Local Notifications in Swift 5 and iOS 13 with UNUSerNotificationCenter by Lachlan Miller

RxSwift

• Simplifying RxSwift code by MortyMerr
• Reactive Heart Rate Monitors in Swift by Leandro Pérez
• The state of modern Rx in iOS by Isaac Carol Weisberg

Siri

• WWDC 2018 for iOS developers: Siri Shortcuts by Jan Olbrich
• Ask user input from Siri in custom Intent for iOS 13 by Abhilash Mathur

Soft Skills

• How I failed 39 interviews and what I’ve learned by Hassan El Desouky
• How to get the first job as an iOS developer by Hassan El Desouky
• How to maintain the focus as a software developer? by Pavle Pesic

Sourcery

• How to supercharge Swift enum-based states with Sourcery by Alexey Demedeckiy

Speeding up workflow & productivity tips

• Squeezing Xcode for hard drive space by Chris Mash
• iOS project best practices and tools by Piotr Gorzelany
• Make your next iOS project a huge success by Alexandros Smponias
• Achieving maximum test readability at no cost for iOS by Victor Magalhães
• Best iOS hacks from Twitter: October Edition by Lisa Dziuba
• Best iOS hacks from Twitter: November Edition by Lisa Dziuba
• Best iOS hacks from Twitter: December Edition by Lisa Dziuba
• Best iOS hacks from Twitter: January & February Edition by Lisa Dziuba
• Best iOS hacks from Twitter: March & April Edition by Lisa Dziuba

Storyboards

• Will Storyboards still be alive? by Nabil Kazi
• Reducing iOS storyboard merge hell by Chris Mash

Swift

• UndoManager in Swift 5 with example by Hitendra Solanki
• Disjoint-set union in C++ and Swift by Hassan El Desouky
• Access Control Basics in iOS Swift — Part 1 by Richard Lu
• Access Control Basics in iOS Swift — Part 2 by Richard Lu
• How can Property Wrappers and Function Builders be leveraged? by Vincent Pradeilles
• Dictionaries in Swift by Adriatik Gashi
• Swift & Objective-C Mixed Languages App by Anand Nimje
• A practical guide to Weak Referencing in Swift by Serge Mata M
• Fireworks — A visual particles editor for Swift by Besher Al Maleh
• Static vs Dynamic Dispatch in Swift: A decisive choice by Shubham Bakshi
• Stubbing in pair with Swift compiler: a spy registration by Bartosz Polaczyk
• Swift Compiler: What we can learn by Ali Pourhadi
• What is PassKit and how to use it? by Kristaps Grinbergs
• Reusable Image Cache in Swift by Maksym Shcheglov
• SwiftLint in Use by Soheil Novinfard
• Say Goodbye to “Index out of range” — Swift by Wendy Liga
• That “return” keyword in guard let statement in Swift by Mumtaz Hussain

SwiftUI

• My takeaway from working with SwiftUI by T. Khan Abbas
• SwiftUI — How to setup a project by Martin Lasek
• SwiftUI - Understanding State by Martin Lasek
• SwiftUI - Dynamic List & Identifiable by Martin Lasek
• SwiftUI & Combine: Better Together by Peter Friese
• Tips & Tricks: Remaking the 2048 game with SwiftUI and Combine by Carlos Corrêa
• The Simple Life(cycle) of a SwiftUI View by Danny Bolella
• Build fast and better Apps with SwiftUI by Jaydeep Vora
• An Instagram clone using SwiftUI and GraphQL — ProfileView by Back4App
• Fast app prototyping with SwiftUI by Carlos Corrêa
• SwiftUI Accessibility: Sort Priority by Rob Whitaker
• SwiftUI Accessibility: Named Controls by Rob Whitaker
• SwiftUI Accessibility: Images by Rob Whitaker
• SwiftUI Accessibility: Accessible User Interface by Rob Whitaker
• SwiftUI Accessibility: Attributes by Rob Whitaker
• SwiftUI Accessibility: Traits by Rob Whitaker
• SwiftUI Accessibility: User Setting by Rob Whitaker
• SwiftUI Accessibility: Semantic Views by Rob Whitaker
• SwiftUI Accessibility by Rob Whitaker
• How To Build A Firebase App With SwiftUI by Sebastian Esser
• Build a Compass app with SwiftUI by Darren
• What’s the Delegation Protocol in SwiftUI? by Danny Bolella
• Gradient in SwiftUI by Ashish Kakkad
• MapKit in SwiftUI by Anand Nimje
• Programmatic navigation in SwiftUI project by Alexey Naumov
• SwiftUI Tutorial: Showing Badge on Tab Bar Item by Jihad Fayz
• Gestures and Animations in SwiftUI by Jihad Fayz
• SwiftUI: Movie Booking App, Part 2: Movie & Actor Detail View by Liquidcoder
• Getting Started with SwiftUI by Nilay Keven

Testing

• How to test iOS apps with Combine, ReactiveSwift and RxSwift by Szymon Mrozek
• Automated UI Testing in Swift & iOS by Joe Williams
• Guarantee Rx memory leaks absence by MortyMerr
• Cracking the Tests for Core Data by S.T.Huang
• The complete guide to Network Unit Testing in Swift by S.T.Huang
• How to use Golden Master testing for your iOS apps by Jan Olbrich
• A complete list of articles on Unit Testing with Swift from 2017 by S.T.Huang

Texture

• Why I build my apps using Texture (and why you should too) by Robin Malhotra

Tutorial

• Getting Started with Moya by Malcolm Kumwenda
• Change splash screen in iOS app for dummies (the better way) by Jan Václavík
• Clean AppDelegate by Anders Borch
• Managing different environments in your Swift project with ease by Yuri Chukhlib
• The Beginner’s Guide to Code Coverage by Jubin Jacob

UIKit

• Speed Up your iOS Development: Demystifying complex UIViews using Decorators by Francisco Javier Trujillo Mata
• A better way to update UICollectionView data in Swift with diff framework by Khoa Pham
• Infinite UIScrollView by Aybek Can Kaya
• Container View Controllers Redux by Dennis Walsh
• Exploring View Hierarchy by Dmytro Anokhin
• How to create reusable UIViews in Swift by Pablo Blanco
• How to use UICollectionViewDiffableDataSource by Aleksej Gurin
• All you need to know about UICollectionViewCompositionalLayout by Aleksej Gurin
• How to build complex layout using UICollectionViewCompositionalLayout and UICollectionViewDiffableDataSource by Aleksej Gurin

URLs

• URL Routing in iOS apps: Compass Beginner Guide by Khoa Pham
• Open URLs using the iOS UIResponder chain in Swift by Joseph El Mallah
• Building URLRequests with ease by Juanpe Catalán
• iOS Universal links and App Referrals using BranchIO Integration by Sumit Kashid

UX & UI design for mobile developers

• The ultimate guide for mobile developers, who want to design by Ahmed Sulaiman
• 42 great UI Kits for iOS engineers by Lisa Dziuba
• 10 Year Challenge: How Popular iOS Apps Have Changed by Valia Havryliuk
• 5 UX and Mobile Marketing Tips to Get Users Hooked to Your App by Pradyut Hande
• Animations in iOS: Tab Bar concepts by Lisa Dziuba
• UI vs Print: Contradictions in typographical practice by Alexander Artsvuni
• Designers guide to user data and CRUD by Tanya Anokhina
• How I Created Apple’s Shortcuts Icon System by Hassan El Desouky
• iOS design by prototyping and iterating by Martin Mitrevski

White Label Solutions

• Managing White Label Solutions by Nabil Kazi
• React Native App: White Label 101 by Sean Najera

Writing Better Code

• Beautiful Code Principles by Pavle Pesic
• Four Rules of Simpler iOS Software Design by Arlind Aliu
• From hobbyist to professional iOS Developer: Single Responsibility Principle by Adrian Zyga
• From hobbyist to professional iOS Developer: Open/Closed Principle by Adrian Zyga
• Explain SOLID Principles from Company perspective by Richard Lu

3D Touch

• Getting started with 3D Touch Peek & Pop— Swift by Ashok Kumar

Addendum (Reference & Inspiration)

Flawless iOS blog is curated by Lisa Dziuba & Valia Havruliyk from Flawless App team. Huge thanks to our good friend onmyway133 for all his help in making this repo. If you are Flawless iOS writer and want to add your article, feel free to create pull requests! And if you wish to become a writer, just share your Medium article\draft via a form. Thanks