Handling Sensitive UI Data in React Native: Practical Approaches Across iOS and Android

Handling Sensitive UI Data in React Native Introduction As mobile applications increasingly deal with sensitive user data—financial details, personal health information, authentication flows—UI-level privacy becomes a non-trivial concern. While backend security is well understood, protecting what’s visible on the screen is often overlooked. The Core Problem Each platform handles screen privacy differently: Android Uses FLAG_SECURE to block screenshots and recordings Requires ContentObserver to detect screenshots iOS No direct API to block screenshots Relies on UITextField (isSecureTextEntry) behavior Key Areas to Address 1. Screen Capture Protection Android provides native support. iOS requires workaround techniques. 2. App Switcher Snapshots Apps must hide sensitive data before going to background. 3. Screenshot Detection Detection is possible, prevention is limited. 4. Clipboard Management Sensitive data should be cleared proactively. 5. Copy/Paste Restrictions Needs native-level int