callstack · thiagobrez · Aug 26, 2026
diff --git a/.changeset/tidy-unicode-tabs.md b/.changeset/tidy-unicode-tabs.md
@@ -0,0 +1,5 @@
+---
+'react-native-bottom-tabs': patch
+---
+
+Fix an iOS Fabric crash when selecting or long-pressing a tab whose key contains non-ASCII characters.
diff --git a/apps/example/e2e/unicode-tab-key.yaml b/apps/example/e2e/unicode-tab-key.yaml
@@ -0,0 +1,18 @@
+appId: bottomtabs.example
+name: Interact with a Unicode tab key
+---
+- launchApp
+- scrollUntilVisible:
+    element:
+      text: ^Native Bottom Tabs$
+    direction: DOWN
+    timeout: 15000
+- tapOn:
+    text: ^Native Bottom Tabs$
+- assertVisible: Press me
+- tapOn:
+    text: ^메시지$
+- assertVisible: 메시지
+- longPressOn:
+    text: ^메시지$
+- assertVisible: 메시지
diff --git a/apps/example/src/Examples/NativeBottomTabs.tsx b/apps/example/src/Examples/NativeBottomTabs.tsx
@@ -57,7 +57,7 @@ function NativeBottomTabs() {
         }}
       />
       <Tab.Screen
-        name="Albums"
+        name="메시지"
         component={Albums}
         options={{
           tabBarButtonTestID: 'albumsTestID',

diff --git a/artifacts/issue-560/README.md b/artifacts/issue-560/README.md
@@ -0,0 +1,38 @@
+# Issue #560 device evidence
+
+Captured on 2026-08-25 with `agent-device 0.20.10`, React Native 0.81.4,
+Fabric enabled, Xcode 27.0 (27A5228h), and the repository example app
+(`bottomtabs.example`).
+
+## Before the fix
+
+- Runtime: iOS 27.0, iPhone 17 Pro simulator.
+- `before/unicode-tab-selection-crash.mp4` records tapping the `메시지` tab.
+- `before/ReactTestApp-selection-crash.ips` records `SIGABRT` in
+  `std::string(char const *)`, called by
+  `-[RCTTabViewComponentView onPageSelectedWithKey:reactTag:]` at line 241.
+- `before/unicode-tab-long-press-crash.mp4` records a long-press gesture on the
+  same tab. The selection delegate aborts before the custom long-press callback
+  can finish.
+- `before/ReactTestApp-long-press-crash.ips` records the corresponding abort.
+
+## After the fix
+
+- Runtime: iOS 26.5, iPhone 17 Pro simulator (matching the issue's reported
+  major runtime), plus an iOS 27.0 selection pass.
+- `after/ios26-unicode-tab-selection-and-long-press.mp4` records successful
+  selection and repeated long-press gestures without termination.
+- `after/ios26-unicode-tab-selected.png` shows the selected Unicode tab and
+  rendered Albums screen.
+- `after/unicode-tab-selected.png` shows the corresponding iOS 27.0 selection
+  pass.
+- No new `ReactTestApp` crash report was generated during either post-fix run.
+- `e2e-result/junit.xml` records the focused agent-device/Maestro regression
+  flow passing (one test, zero failures). The corresponding interaction video,
+  replay, and gesture telemetry are in the nested `attempt-1` directory.
+
+The XCUITest synthesized hold used by `agent-device longpress` selected the tab
+but did not trigger this example's custom `UILongPressGestureRecognizer`; the
+same limitation reproduced on the existing ASCII `Article` tab. The focused
+Maestro flow therefore asserts the original regression boundary: Unicode tap
+and long-press gestures leave the app alive and the Unicode tab visible.
diff --git a/artifacts/issue-560/after/ios26-unicode-tab-selected.png b/artifacts/issue-560/after/ios26-unicode-tab-selected.png
diff --git a/artifacts/issue-560/after/ios26-unicode-tab-selection-and-long-press.gesture-telemetry.json b/artifacts/issue-560/after/ios26-unicode-tab-selection-and-long-press.gesture-telemetry.json
@@ -0,0 +1,41 @@
+{
+  "version": 1,
+  "generatedAt": "2026-08-25T00:19:54.264Z",
+  "events": [
+    {
+      "kind": "tap",
+      "tMs": 2458.2578125,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874
+    },
+    {
+      "kind": "longpress",
+      "tMs": 14660,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 1000
+    },
+    {
+      "kind": "longpress",
+      "tMs": 21047,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 3000
+    },
+    {
+      "kind": "longpress",
+      "tMs": 43627,
+      "x": 75,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 3000
+    }
+  ]
+}
diff --git a/artifacts/issue-560/after/ios26-unicode-tab-selection-and-long-press.mp4 b/artifacts/issue-560/after/ios26-unicode-tab-selection-and-long-press.mp4
diff --git a/artifacts/issue-560/after/unicode-tab-before-interactions.png b/artifacts/issue-560/after/unicode-tab-before-interactions.png
diff --git a/artifacts/issue-560/after/unicode-tab-selected.png b/artifacts/issue-560/after/unicode-tab-selected.png
diff --git a/artifacts/issue-560/before/ReactTestApp-long-press-crash.ips b/artifacts/issue-560/before/ReactTestApp-long-press-crash.ips
diff --git a/artifacts/issue-560/before/ReactTestApp-selection-crash.ips b/artifacts/issue-560/before/ReactTestApp-selection-crash.ips
diff --git a/artifacts/issue-560/before/unicode-tab-before.png b/artifacts/issue-560/before/unicode-tab-before.png
diff --git a/artifacts/issue-560/before/unicode-tab-long-press-crash.gesture-telemetry.json b/artifacts/issue-560/before/unicode-tab-long-press-crash.gesture-telemetry.json
@@ -0,0 +1,15 @@
+{
+  "version": 1,
+  "generatedAt": "2026-08-25T00:11:41.551Z",
+  "events": [
+    {
+      "kind": "longpress",
+      "tMs": 2168,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 8373
+    }
+  ]
+}
diff --git a/artifacts/issue-560/before/unicode-tab-long-press-crash.mp4 b/artifacts/issue-560/before/unicode-tab-long-press-crash.mp4
diff --git a/artifacts/issue-560/before/unicode-tab-selection-crash.gesture-telemetry.json b/artifacts/issue-560/before/unicode-tab-selection-crash.gesture-telemetry.json
@@ -0,0 +1,14 @@
+{
+  "version": 1,
+  "generatedAt": "2026-08-25T00:10:30.072Z",
+  "events": [
+    {
+      "kind": "tap",
+      "tMs": 2510.88330078125,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874
+    }
+  ]
+}
diff --git a/artifacts/issue-560/before/unicode-tab-selection-crash.mp4 b/artifacts/issue-560/before/unicode-tab-selection-crash.mp4
diff --git a/...b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/recording.gesture-telemetry.json b/...b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/recording.gesture-telemetry.json
@@ -0,0 +1,53 @@
+{
+  "version": 1,
+  "generatedAt": "2026-08-25T00:25:26.472Z",
+  "events": [
+    {
+      "kind": "swipe",
+      "tMs": 6958.691650390625,
+      "x": 201,
+      "y": 495,
+      "x2": 201,
+      "y2": 191,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 912
+    },
+    {
+      "kind": "swipe",
+      "tMs": 10499.9970703125,
+      "x": 201,
+      "y": 495,
+      "x2": 201,
+      "y2": 191,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 917
+    },
+    {
+      "kind": "tap",
+      "tMs": 14251.433349609375,
+      "x": 201,
+      "y": 642,
+      "referenceWidth": 402,
+      "referenceHeight": 874
+    },
+    {
+      "kind": "tap",
+      "tMs": 16403.9990234375,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874
+    },
+    {
+      "kind": "longpress",
+      "tMs": 18017.404541015625,
+      "x": 159,
+      "y": 822,
+      "referenceWidth": 402,
+      "referenceHeight": 874,
+      "durationMs": 3000
+    }
+  ]
+}
diff --git a/...-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/recording.mp4 b/...-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/recording.mp4
diff --git a/.../b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/replay-timing.ndjson b/.../b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/replay-timing.ndjson
@@ -0,0 +1,26 @@
+{"type":"replay_test_attempt_start","ts":"2026-08-25T00:24:57.582Z","replayPath":"/Users/thiagobrez/.codex/worktrees/98e3/react-native-bottom-tabs/apps/example/e2e/unicode-tab-key.yaml","session":"issue560-e2e:test:b9e1da5f1f6b7d0c:1-unicode-tab-key:attempt-1","requestId":"b9e1da5f1f6b7d0c:test:1:unicode-tab-key.yaml:attempt:1"}
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+{"type":"video_preroll_done","session":"issue560-e2e:test:b9e1da5f1f6b7d0c:1-unicode-tab-key:attempt-1","durationMs":1003,"requestedDurationMs":1000,"ts":"2026-08-25T00:25:02.094Z"}
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+{"type":"replay_test_cleanup_stop","ts":"2026-08-25T00:25:31.476Z","session":"issue560-e2e:test:b9e1da5f1f6b7d0c:1-unicode-tab-key:attempt-1","ok":true,"durationMs":1013}
diff --git a/.../e2e-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/replay.ad b/.../e2e-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/replay.ad
@@ -0,0 +1,18 @@
+appId: bottomtabs.example
+name: Interact with a Unicode tab key
+---
+- launchApp
+- scrollUntilVisible:
+    element:
+      text: ^Native Bottom Tabs$
+    direction: DOWN
+    timeout: 15000
+- tapOn:
+    text: ^Native Bottom Tabs$
+- assertVisible: Press me
+- tapOn:
+    text: ^메시지$
+- assertVisible: 메시지
+- longPressOn:
+    text: ^메시지$
+- assertVisible: 메시지
diff --git a/...e2e-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/result.txt b/...e2e-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/result.txt
@@ -0,0 +1,6 @@
+file: /Users/thiagobrez/.codex/worktrees/98e3/react-native-bottom-tabs/apps/example/e2e/unicode-tab-key.yaml
+session: issue560-e2e:test:b9e1da5f1f6b7d0c:1-unicode-tab-key:attempt-1
+attempt: 1/1
+status: passed
+replayed: 8
+healed: 0
diff --git a/.../b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/unicode-tab-key.yaml b/.../b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml/attempt-1/unicode-tab-key.yaml
@@ -0,0 +1,18 @@
+appId: bottomtabs.example
+name: Interact with a Unicode tab key
+---
+- launchApp
+- scrollUntilVisible:
+    element:
+      text: ^Native Bottom Tabs$
+    direction: DOWN
+    timeout: 15000
+- tapOn:
+    text: ^Native Bottom Tabs$
+- assertVisible: Press me
+- tapOn:
+    text: ^메시지$
+- assertVisible: 메시지
+- longPressOn:
+    text: ^메시지$
+- assertVisible: 메시지
diff --git a/artifacts/issue-560/e2e-result/junit.xml b/artifacts/issue-560/e2e-result/junit.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuites>
+  <testsuite name="agent-device replay suite" tests="1" failures="0" skipped="0" time="33.903">
+    <testcase classname="/Users/thiagobrez/.codex/worktrees/98e3/react-native-bottom-tabs/apps/example/e2e" name="Interact with a Unicode tab key" file="/Users/thiagobrez/.codex/worktrees/98e3/react-native-bottom-tabs/apps/example/e2e/unicode-tab-key.yaml" time="33.896">
+      <system-out>status: passed
+durationMs: 33896
+attempts: 1
+session: issue560-e2e:test:b9e1da5f1f6b7d0c:1-unicode-tab-key:attempt-1
+replayed: 8
+healed: 0
+artifactsDir: /Users/thiagobrez/.codex/worktrees/98e3/react-native-bottom-tabs/artifacts/issue-560/e2e-result/b9e1da5f1f6b7d0c/apps__example__e2e__unicode-tab-key.yaml</system-out>
+    </testcase>
+  </testsuite>
+</testsuites>
diff --git a/artifacts/issue-560/logs/after-launch-console.log b/artifacts/issue-560/logs/after-launch-console.log
@@ -0,0 +1,3 @@
+2026-08-25 01:14:29.136 ReactTestApp[52683:132402160] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
+objc[52683]: Class UIAccessibilityLoaderWebShared is implemented in both /private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5390.6.rDKeNs/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebCore.axbundle/WebCore (0x111940310) and /private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5390.6.rDKeNs/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebKit.axbundle/WebKit (0x110e38398). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.
+2026-08-25 01:14:29.692 ReactTestApp[52683:132402160] Unbalanced calls to begin/end appearance transitions for <UIViewController: 0x114f50f80>.
diff --git a/artifacts/issue-560/logs/before-launch-console.log b/artifacts/issue-560/logs/before-launch-console.log
@@ -0,0 +1,3 @@
+2026-08-25 01:07:49.595 ReactTestApp[34573:132373937] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
+2026-08-25 01:07:49.933 ReactTestApp[34573:132373937] Unbalanced calls to begin/end appearance transitions for <UIViewController: 0x10bd2b780>.
+objc[34573]: Class UIAccessibilityLoaderWebShared is implemented in both /private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5390.6.rDKeNs/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebCore.axbundle/WebCore (0x1128c0310) and /private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5390.6.rDKeNs/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebKit.axbundle/WebKit (0x112874398). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.
diff --git a/artifacts/issue-560/logs/ios26-after-launch-console.log b/artifacts/issue-560/logs/ios26-after-launch-console.log
@@ -0,0 +1,2 @@
+2026-08-25 01:18:12.976 ReactTestApp[62721:132419046] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
+objc[62721]: Class UIAccessibilityLoaderWebShared is implemented in both /Library/Developer/CoreSimulator/Volumes/iOS_23F77/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 26.5.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebCore.axbundle/WebCore (0x1269c0310) and /Library/Developer/CoreSimulator/Volumes/iOS_23F77/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 26.5.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebKit.axbundle/WebKit (0x126788398). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.
diff --git a/packages/react-native-bottom-tabs/ios/RCTTabViewComponentView.mm b/packages/react-native-bottom-tabs/ios/RCTTabViewComponentView.mm
@@ -238,7 +238,7 @@ - (void)onPageSelectedWithKey:(NSString *)key reactTag:(NSNumber *)reactTag {
   auto eventEmitter = std::static_pointer_cast<const RNCTabViewEventEmitter>(_eventEmitter);
   if (eventEmitter) {
     eventEmitter->onPageSelected(RNCTabViewEventEmitter::OnPageSelected{
-      .key = [key cStringUsingEncoding:kCFStringEncodingUTF8]
+      .key = std::string([key UTF8String] ?: "")
     });
   }
 }
@@ -247,7 +247,7 @@ - (void)onLongPressWithKey:(NSString *)key reactTag:(NSNumber *)reactTag {
   auto eventEmitter = std::static_pointer_cast<const RNCTabViewEventEmitter>(_eventEmitter);
   if (eventEmitter) {
     eventEmitter->onTabLongPress(RNCTabViewEventEmitter::OnTabLongPress {
-      .key = [key cStringUsingEncoding:kCFStringEncodingUTF8]
+      .key = std::string([key UTF8String] ?: "")
     });
   }
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		2026-08-25 01:18:12.976 ReactTestApp[62721:132419046] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
		objc[62721]: Class UIAccessibilityLoaderWebShared is implemented in both /Library/Developer/CoreSimulator/Volumes/iOS_23F77/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 26.5.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebCore.axbundle/WebCore (0x1269c0310) and /Library/Developer/CoreSimulator/Volumes/iOS_23F77/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 26.5.simruntime/Contents/Resources/RuntimeRoot/System/Library/AccessibilityBundles/WebKit.axbundle/WebKit (0x126788398). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.