From b60dd88702a2be2af942a3d104d728970a4c42d6 Mon Sep 17 00:00:00 2001
From: Lucas Fernandes Nogueira <lucas@tauri.app>
Date: Mon, 19 Jan 2026 13:16:16 -0300
Subject: [PATCH] fix(barcode-scanner): start capture session on a separate
 thread (#3223)

fixes the given warning:

Thread Performance Checker: -[AVCaptureSession startRunning] should be called from background thread. Calling it on the main thread can lead to UI unresponsiveness

which might cause a UI freeze
---
 .changes/barcode-scanner-ios-thread.md                      | 6 ++++++
 .../barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift  | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 .changes/barcode-scanner-ios-thread.md

diff --git a/.changes/barcode-scanner-ios-thread.md b/.changes/barcode-scanner-ios-thread.md
new file mode 100644
index 000000000..61365bfa8
--- /dev/null
+++ b/.changes/barcode-scanner-ios-thread.md
@@ -0,0 +1,6 @@
+---
+barcode-scanner: patch
+barcode-scanner-js: patch
+---
+
+On iOS, start the scanning session on a separate thread to fix performance issues.
diff --git a/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift b/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift
index 4ad399daf..450c3cf77 100644
--- a/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift
+++ b/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift
@@ -286,7 +286,9 @@ class BarcodeScannerPlugin: Plugin, AVCaptureMetadataOutputObjectsDelegate {
     }
 
     self.metaOutput!.metadataObjectTypes = self.scanFormats
-    self.captureSession!.startRunning()
+    DispatchQueue.main.async {
+      self.captureSession!.startRunning()
+    }
 
     self.isScanning = true
   }