Adaptive skill practice — find your level, get sharper.

iOS Development practice

SwiftUI, UIKit lifecycle, and shipping to the App Store

Building iOS apps the way Apple’s documentation teaches it. SwiftUI first — views as value types, the state system (@State, @Binding, @Observable, environment), view identity and lifetime, lists and navigation, layout and animations — plus the UIKit foundations working apps still touch (view controller lifecycle, delegation patterns). App lifecycle and scenes, concurrency on the main actor, persistence choices (UserDefaults, Codable, SwiftData/Core Data concepts), networking with URLSession, notifications, accessibility (VoiceOver, Dynamic Type), and the ship process — signing, provisioning, TestFlight, and App Store review realities. Every explanation names the framework rule, the classic mistake, and a portable principle. Authored from developer.apple.com at the current stable iOS release.

• Meets you at your level — never too easy, never too hard.

• Adapts every question to how you’re doing.

• Tracks your level over time. Skill practice, not a test.

New here? Read the iOS Development guide

A free 16-minute primer — the mental model, the mistakes beginners make, and what to practise first.

Curriculum

184 concepts across 24 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.

A. The app, its scenes and the lifecycle

B. The SwiftUI view: a description, not an object

C. State and data flow

D. View identity, lifetime and the async hooks

E. The layout system

F. Lists, scrolling and render cost

G. Navigation and presentation

H. Animation and gestures

I. UIKit: view controllers and the responder chain

J. Auto Layout

K. Table and collection views

L. SwiftUI and UIKit interop

M. Concurrency and the main actor

N. Networking with URLSession

O. Persistence: SwiftData, Core Data, defaults, Keychain and files

P. Images, memory and profiling

Q. Background execution, notifications and permissions

R. Accessibility

S. Testing and debugging

T. Signing, capabilities and App Store distribution

U. Human Interface Guidelines expectations

V. Framework awareness: which technology owns which job

W. Xcode: targets, schemes and what the Simulator cannot tell you

X. Structuring an app: layers, ownership and broadcast

View the full curriculum →

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