All Articles
Previewing Files In-App in Rork — calling Quick Look safely from Expo
How to preview PDFs, images, and Office documents in place without sending users out of your app, using Quick Look (QLPreviewController) from Rork (Expo). Covers pre-downloading remote files, the local-URL requirement, the Android FileProvider alternative, and handling the share button.
Adding App Store Promoted In-App Purchases to a Rork App
How to list purchases on your App Store product page and carry a buyer straight into your in-app purchase flow. Covers receiving deferred purchases that arrive before the app is launched or the user is signed in, with implementation for both react-native-iap and StoreKit 2.
Building StandBy-Optimized Widgets in Rork Max
A hands-on walkthrough for tuning WidgetKit widgets for StandBy mode, the landscape charging display in iOS 17+. Covers always-on dimming, night mode, and container backgrounds, including which parts of Rork Max's generated code you still have to finish by hand.
Adding a keyboard toolbar to Rork text inputs — unifying iOS InputAccessoryView and an Android bar into one component
How to add a toolbar pinned above the keyboard — a Done button or quick-insert actions — to the React Native app Rork generates. The iOS InputAccessoryView and a hand-built Android bar, folded into one reusable component, with working code.
Clipboard UX in Expo apps — copy and paste without flooding users with iOS's paste banner
When you wire up copy and paste with expo-clipboard, iOS's paste permission banner can fire constantly and quietly erode trust. Here's exactly when the banner appears, and how hasStringAsync lets you gate a Paste button without ever reading the contents.
Handling iOS Limited Photo Library Access in a Rork (Expo) App
Handle iOS limited photo library access (selected photos only) correctly in a Rork (Expo) app. Covers the three states of full / limited / denied, designing a screen that works from the selected subset, and a path to add more photos, all with working code.
Respecting Metered Connections and Low Data Mode in an Image-Heavy Rork App
In an image-heavy Rork (Expo) app, hold back prefetching on metered connections and Low Data Mode. Read the connection's character from NetInfo details, drop image quality, and defer prefetch with an adaptive policy layer, all with working code.
Designing a Referral System Without a Heavy Backend
Add a referral program to your Rork (Expo) app without standing up a fleet of servers. Covers code generation, deferred deep-link attribution on first launch, idempotent reward fulfillment that never double-pays, and basic guards against self-referral and device farming, all with working code.
When a New Architecture Migration Only Janks in Release Builds — Field Notes on Catching Silent Interop-Layer Fallback
A Rork app on the New Architecture scrolled fine in development but stuttered only in release builds on real devices. The cause: a legacy native module quietly falling back to the interop layer. Field notes on measuring it and rolling out a fix without reverting the whole app.
Rork × Vision Camera v4: A Production-Grade Camera Stack with QR, OCR, and ML Inference
Wire React Native Vision Camera v4 into a Rork project end-to-end — frame processors, ML inference, QR/OCR, plus battery and thermal tuning, a real-device test matrix, store review, and a staged rollout.
How far Rork Companion's free device testing goes — and when to pay the $99 Apple Developer Program
Rork Companion lets you test on a real device without a paid Apple Developer account. Here is exactly where the free path stops, the concrete triggers for paying the $99, and what to stage before your first signed build — from running six apps as an indie developer.
Design On-Device Core ML So Cold Start and Heat Don't Break It
Put on-device Core ML in the native Swift that Rork Max generates and you hit two walls before accuracy: the first inference is slow, and the device heats up and slows down. Here is a design built around cold start and a thermal budget, with working Swift.