Freeze Frame Scan Effect

Pause the React Native camera after a successful scan, play a short animation, then resume. Makes scanning feel deliberate and smooth.

What is freeze frame?

When enableFreezeFrame is on, the scanner doesn't just fire the callback and keep going. Instead, it:

Detects a stable code (3 consistent frames)
Freezes the camera preview
Plays a short animation (a flash or scanning band, depending on whether proScanner is also on)
Fires onCodeScanned with the result
Auto-resumes scanning after about 500–800ms

This makes the scan feel intentional rather than just silently triggering. Users get a clear visual confirmation that something was scanned.

Enabling it

<Scanner
  style={StyleSheet.absoluteFill}
  enableFreezeFrame={true}
  onCodeScanned={(result) => {
    console.log('Scanned:', result.data);
  }}
/>

Resuming manually with a ref

If you want to stay paused after the scan (for example, to show a confirmation screen), you can call resumeScanning() yourself:

import React, { useRef, useState } from 'react';
import { View, Text, Button, StyleSheet } from 'react-native';
import { Scanner } from 'react-native-scanner-pro';

export default function ScanScreen() {
  const scannerRef = useRef(null);
  const [lastScan, setLastScan] = useState(null);

  function handleScan(result) {
    setLastScan(result.data);
    // The camera is currently frozen here
    // Call resumeScanning() whenever you're ready
  }

  return (
    <View style={{ flex: 1 }}>
      <Scanner
        ref={scannerRef}
        style={StyleSheet.absoluteFill}
        enableFreezeFrame={true}
        onCodeScanned={handleScan}
      />

      {lastScan && (
        <View style={styles.resultCard}>
          <Text style={styles.resultText}>{lastScan}</Text>
          <Button
            title="Scan another"
            onPress={() => {
              setLastScan(null);
              scannerRef.current?.resumeScanning();
            }}
          />
        </View>
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  resultCard: {
    position: 'absolute',
    bottom: 40,
    left: 20,
    right: 20,
    backgroundColor: '#fff',
    borderRadius: 12,
    padding: 16,
    alignItems: 'center',
  },
  resultText: {
    fontSize: 16,
    marginBottom: 12,
  },
});

How stability detection works

Both on iOS and Android, the scanner requires 3 consecutive camera frames to contain the same code before it considers a scan "stable". Only then does the freeze frame trigger and the callback fire.

This is by design. Without stability gating, a camera that picks up a code for even one frame could trigger the callback — which leads to inconsistent behavior when the camera is moving fast or lighting is poor.

Tips

Freeze frame works best in flows where the user scans one code at a time (checkout, ticket validation, package scanning)
If you're building a bulk scan flow (scan many codes quickly), don't use freeze frame — let the scanner run continuously and debounce the results in JavaScript instead
The freeze duration is about 500–800ms. It's intentionally short so the experience stays snappy.