auto-detect composer language from keyboard

adds a new expo-keyboard-language native module that reads the current keyboard language on iOS (via first responder's textInputMode) and Android (via InputMethodManager). iOS also gets real-time updates when the keyboard language changes. users opt in via Settings > Languages > "Automatically detect post language from keyboard" (native only, marked experimental). when enabled, the composer language tracks the keyboard language. users can override per-session by selecting a language manually, and re-enable auto mode via the "Automatic" item in the language menu. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-02-28 16:00:45 +02:00
parent 6cdc1fe2b5
commit d1666345ae
15 changed files with 395 additions and 40 deletions
@@ -0,0 +1,20 @@
+Pod::Spec.new do |s|
+  s.name           = 'ExpoKeyboardLanguage'
+  s.version        = '1.0.0'
+  s.summary        = 'Expo module to detect the current keyboard language'
+  s.description    = 'Expo module to detect the current keyboard language'
+  s.author         = ''
+  s.homepage       = 'https://github.com/bluesky-social/social-app'
+  s.platforms      = { :ios => '13.4' }
+  s.source         = { git: '' }
+  s.static_framework = true
+
+  s.dependency 'ExpoModulesCore'
+
+  s.pod_target_xcconfig = {
+    'DEFINES_MODULE' => 'YES',
+    'SWIFT_COMPILATION_MODE' => 'wholemodule'
+  }
+
+  s.source_files = "**/*.{h,m,mm,swift,hpp,cpp}"
+end
@@ -0,0 +1,75 @@
+import ExpoModulesCore
+
+public class ExpoKeyboardLanguageModule: Module {
+  public func definition() -> ModuleDefinition {
+    Name("ExpoKeyboardLanguage")
+
+    Events("onKeyboardLanguageChange")
+
+    Function("getCurrentKeyboardLanguage") {
+      return self.currentKeyboardLanguage()
+    }
+
+    OnStartObserving {
+      NotificationCenter.default.addObserver(
+        self,
+        selector: #selector(self.onInputModeOrResponderChange),
+        name: UITextInputMode.currentInputModeDidChangeNotification,
+        object: nil
+      )
+      NotificationCenter.default.addObserver(
+        self,
+        selector: #selector(self.onInputModeOrResponderChange),
+        name: UIResponder.keyboardDidShowNotification,
+        object: nil
+      )
+    }
+
+    OnStopObserving {
+      NotificationCenter.default.removeObserver(
+        self,
+        name: UITextInputMode.currentInputModeDidChangeNotification,
+        object: nil
+      )
+      NotificationCenter.default.removeObserver(
+        self,
+        name: UIResponder.keyboardDidShowNotification,
+        object: nil
+      )
+    }
+  }
+
+  private var lastLanguage: String?
+
+  @objc
+  private func onInputModeOrResponderChange() {
+    let language = currentKeyboardLanguage()
+    if language != lastLanguage {
+      lastLanguage = language
+      sendEvent("onKeyboardLanguageChange", [
+        "language": language as Any
+      ])
+    }
+  }
+
+  private func currentKeyboardLanguage() -> String? {
+    let keyWindow = UIApplication.shared.connectedScenes
+      .compactMap { $0 as? UIWindowScene }
+      .flatMap { $0.windows }
+      .first { $0.isKeyWindow }
+
+    return keyWindow?.findFirstResponder()?.textInputMode?.primaryLanguage
+  }
+}
+
+private extension UIView {
+  func findFirstResponder() -> UIView? {
+    if isFirstResponder { return self }
+    for subview in subviews {
+      if let found = subview.findFirstResponder() {
+        return found
+      }
+    }
+    return nil
+  }
+}