Arabic support in React Native is broader than turning on I18nManager. Direction affects layout order, icons, lists, gestures, mixed-language strings, fonts, and navigation transitions. A screen can look correct in one simulator and fail after a language change or on a smaller device.
Decide how direction changes
Start by deciding whether the app is Arabic-only or multilingual. Forcing RTL often requires a full reload, so language selection, persistence, and restart behavior should be designed before the screen count grows.
Keep language state in one owned place. Avoid letting individual screens make independent direction decisions.
Use direction-aware layout rules
Do not scatter row-reverse across every component. Set direction at a sensible container boundary and use start and end semantics for alignment and spacing.
Some elements have directional meaning. Back arrows, progress, carousels, swipes, charts, and media controls need a deliberate rule. An icon should not be flipped twice by both the asset and the layout.
Load real Arabic font weights
Bundle only the font files and weights that the design uses. Test the registered names on iOS and Android, because an incorrect name can trigger a silent fallback.
Review line height, diacritics, numerals, buttons, validation errors, and long headings. A bold weight that looks acceptable in Latin may close Arabic counters and reduce readability.
Keep components reusable
A field, card, or navigation item should adapt to language without becoming two unrelated components. Pass localized content and direction-aware properties through a stable interface.
Test loading, empty, error, disabled, and long-content states in both languages. Avoid fixed heights around translated text.
For user-generated content, isolate mixed-direction values such as email addresses, URLs, codes, and usernames. Do not assume the whole string follows the interface language.
Review lists and gestures
FlatList behavior, initial scroll positions, paging, and horizontal carousels can vary with direction and platform. Test them on the target React Native version rather than relying on an old workaround.
Gesture meaning should match user expectation. A navigation swipe and a content carousel may need different direction rules.
Build a release matrix
Test iOS and Android, Arabic and English, and the supported compact and common phone sizes. Add larger text, an Arabic keyboard, mixed strings, slow networking, API errors, and offline recovery.
Use a screen reader for the primary journey. Visual order does not prove that accessibility focus and reading order are correct.
RTL support is ready when users can complete the main task in both languages, long text remains readable, icons and gestures preserve their meaning, and the target devices pass. One clean screenshot is only a starting point.