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iOS

Every article on iOS published on this blog, newest first: 8 in total, written by Ramón Chancay.

8 articles on iOS

Mobile13 Sep 202617 min read

What you can only do in native: WidgetKit, Live Activities, App Intents, StoreKit 2, Foundation Models and watchOS

What only native iOS can do and React Native can't: WidgetKit, Live Activities, App Intents and Siri, StoreKit 2, Foundation Models on device, and watchOS.

Illustration of a table of cases where each row is compared against a reference, next to a stopwatch that represents build time

Mobile12 Sep 202616 min read

iOS testing and tooling for seniors: Swift Testing, snapshots, mocks, Instruments and build times

iOS testing coming from Jest: Swift Testing vs XCTest, snapshots, mocks via protocols and URLProtocol, XCUITest vs Maestro, Instruments and faster build times.

Illustration of a row of small modules on the left connected one to one with system blocks on the right, with one block marked as the main one

Mobile9 Sep 202617 min read

From the expo-* ecosystem to Apple frameworks: the equivalence table by domain

Which Apple framework replaces each expo-* package in native iOS: camera, location, auth, payments, notifications, files, plus Info.plist permissions.

Illustration of three stacked storage layers, with a separate sealed box representing the Keychain and a cloud syncing with the main layer

Mobile8 Sep 202614 min read

iOS persistence: SwiftData, GRDB and Keychain, and why Realm is no longer an option

Choosing between SwiftData, GRDB and Core Data for iOS persistence, why Realm is out, why the Keychain survives uninstalls, and offline-first with CloudKit.

Illustration of several tasks running in parallel inside one frame and converging on a single exit point, with an isolated actor to one side

Mobile7 Sep 202616 min read

Swift concurrency: goodbye event loop. async let, TaskGroup, actors and Swift 6

Swift Concurrency for JavaScript developers: no event loop, async let and TaskGroup instead of Promise.all, actors, @MainActor, Sendable and Swift 6 data races.

Illustration of a view tree where each node proposes a size to its children and receives an answer, with a main path highlighted

Mobile3 Sep 202616 min read

SwiftUI is not React, even if it looks like it: body, identity, modifiers and layout

SwiftUI for React developers: body vs render, view identity, why modifier order matters, layout without flexbox, and how hooks map to property wrappers.

Illustration of two type systems: a shape that gets copied as it passes from hand to hand and another that is shared by reference, with a container that may be empty

Mobile2 Sep 202617 min read

Swift for people who already master TypeScript: the five differences that change how you design

Swift for TypeScript developers: value vs reference semantics, optionals in the type system, enums with associated data, protocol extensions, Codable over zod.

Illustration of two paths leaving the same point: one covers two platforms with a single layer and the other reaches the system's capabilities directly

Mobile1 Sep 202617 min read

Why a senior React Native developer should learn native in 2026

When native iOS beats React Native (widgets, day-one APIs, on-device ML), when it loses (two platforms, OTA, team) and why Swift adds to your toolkit.