| Qualified | Competent | Expert |
|---|---|---|
| Autolayout | ||
| Anatomy of constraint, external and internal changes, autolayout vs frame-based layout |
Stackview, debugging autolayout, anchors, safe area, self-sized views, Hugging priority/Content compression resistance |
Layout directions (left-to-right/right-to-left), VFL, autoresizing masks (springs&struts) |
| Xibs (Nibs), Storyboards | ||
| xibs and/vs storyboards, custom UI elements in xibs and storyboards, file’s owner, loading from xibs and storyboards programmaticaly, segue, pass data via segue, customization ui best practices | IBInspectable/IBDesignable, size classes, xib vs nib, NIB object lifecycle, unwind segues, git conflicts in xibs and storyboards, xib’s xml structure | |
| Animations | ||
| animations via autolayout,UIView.animate, CALayer, CAAnimation | facebook pop, UIDynamics, 3D animations, UIViewPropertyAnimator, CADisplayLink | SpriteKit? Adobe After Effects? |
| Other | ||
| Localizations HIG |
Internationalization i18n & Localisation l10n |
| Qualified | Competent | Expert |
|---|---|---|
| Core Data | ||
| Core Data Stack & Architecture, Relationships, Data Types, fetching | Performance, concurrency/multithreading/multiple contexts, changes and updates tracking | Migrations, nestedcontexts, profiling, persistence under the hood (SQLite, XML, Binary, In-memory). iCloud synchronization,Security |
| Other approaches | ||
| UserDefaults, KeyedArchiver | Realm, Keychain |
| Qualified | Competent | Expert |
|---|---|---|
| Swift | ||
| Basic syntax, optionals, control flow, error handling, memory management (ARC), classes, structures, enums, functions, initialization/deinitialization, inheritance | Objective-C Interoperability, POP, generics, type safety, KVO/KVC, value and reference types, subscripts, bitwise operators, overflow operators, operator methods, access control | Swift performance, Swift + LLVM, method dispatch, swizzling, @dynamic, final, playgrounds, Swift Standard Library |
| Objective-C | ||
| Basic syntax, variables and types, collections, initializations | Blocks, categories, Integrating Swift into ObjC, C/C++ code usage inside Obj-C | Runtime, Class structure (isa), Method swizzling, MRC |
| Qualified | Competent | Expert |
|---|---|---|
| URLSession | ||
| NSURLSession basics, encoding/decoding of URL data, lifecycle of a URL Session | Multipart requests, response caching, handling redirects | Background handling, NSURLAuthentication, TLS Chain Validation, streams, sockets, NSURLConnection |
| Response handling | ||
| JSONSerialization, error handling | Codable/Decodable, NSCoding | |
| Building a network layer | ||
| Alamofire, mappers | Moya , CFNetwork |
| Qualified | Competent | Expert |
|---|---|---|
| Understanding of code signing, provisioning profiles, app schemes configuration, Launching app on device | Working with iTunes Connect, App Review Guidelines. Build automation, beta-testing tools and deployment platforms. Fastlane | Advanced automation skills (plugins, scripts) |
| Qualified | Competent | Expert |
|---|---|---|
| UIViewController lifecycle, iOS app lifecycle, NotificationCenter | Working with filesystem, background modes, Xcode project structure |
| Qualified | Competent | Expert |
|---|---|---|
| Grand Central Dispatch | ||
| basic knowledge about multithreading and concurrent programming, deadlocks, race conditions. async vs sync, main vs background | Dispatch queues, units of work, prioritizing, quality of service, timing (time & after) | Dispatch groups, semaphores, dispatch I/O, dispatch sources. Interprocess communication, XPC Services |
| NSOperation | ||
| basic knowledge about multithreading and concurrent programming, deadlocks, race conditions. | Operation executing, cancelling and configuring. Operation states. NSOperationQueue. Subclassing and overriding. BlockOperation | Operation dependencies, NSOperationQueue |
| Thread (NSThread) | ||
| Ability to work with Thread. Initializing, starting/stopping, state handling, prioritizing. Locks, NSRunLoop. |
| Qualified | Competent | Expert |
|---|---|---|
| Push Notifications, URL schemes | Deep linking, Universal links, App Indexing | Advertisements (AdSupport, AdMob etc) |
| Qualified | Competent | Expert |
|---|---|---|
| Basic knowledge of unit tests | Complex unit tests, XCTest, Quick/Nimble (Kiwi for Obj-C) | TDD, UI tests, web testing and debugging |
| Qualified | Competent | Expert |
|---|---|---|
| xcodebuild, xcrun. Targets, bundles, frameworks, libraries. pbxproj, xcconfig, xcodeproj, xcworkspace, xcscheme, xctoolchain. Build phases, shell scripts, build rules, build configurations. | lldb, lipo, llbuild, swift package manager, linker. Flags |
| Qualified | Competent | Expert |
|---|---|---|
| Keychain, iOS security guidelines, TouchID, FaceID | Security framework - authorization and authentication, code signing, cryptography, result codes. Secure coding guide. iOS security overview |
| Qualified | Competent | Expert |
|---|---|---|
| Basic knowledge of measuring app performance with Xcode instruments. Object Graph, Network Link Conditioner. UI optimization (opaque views, fat XIBs, image sizes, main thread blockers, layers vs paths etc) | Optimization modes in Xcode, whole module optimization, gzip compression, lazy load and reuse of views, caching, tableview and collectionview optimization, date formatters | Memory warnings handling, speeding up app launch time(static vs dynamic libraries, merging several frameworks into one monolithic) |
| Qualified | Competent | Expert |
|---|---|---|
| Delegate, MVC, observer, chain of responsibility, Singleton. | MVP, MVVM, VIPER, VIP, Router. State, Strategy, Visitor. Abstract Factory, Factory Method, Builder. Adapter, Decorator, Facade. | Flux, Redux. Mediator, Memento, Command, Prototype, Proxy |
| Qualified | Competent | Expert |
|---|---|---|
| Basic knowledge. Recursion | RxSwift/ReactiveCocoa/ReactiveSwift/ReactiveKit, higher order functions. | Futures&Promises. Pure functions. Complete understanding of reactive approach. Functors, Applicatives and Monads. |
| Qualified | Competent | Expert |
|---|---|---|
| Basic AVFoundation, CoreBluetooth, AVKit | Core Audio. Advanced AVFoundation, CoreBluetooth, AVKit. WebKit. Core Telephony, Core Media | Core Motion, IOKit, Compression |
| Qualified | Competent | Expert |
|---|---|---|
| Basic MapKit & CoreLocation. Basic socials integration. Sharing | AddressBook, AddressBookUI, Messages, MessagesUI, Advanced MapKit & CoreLocation. Advanced socials integration. | In-app purchases |
| Qualified | Competent | Expert |
|---|---|---|
| App extensions | tvOS, watchOS, SpriteKit, SceneKit, HomeKit, HealthKit, EventKit | Metal, CoreGraphics, OpenGL, cross-platform development, ARKit CryptoTokenKit, SiriKit |