init

ios/.gitignore

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+.idea/
+.vagrant/
+.sconsign.dblite
+.svn/
+
+.DS_Store
+*.swp
+profile
+
+DerivedData/
+build/
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
+
+.generated/
+
+*.pbxuser
+*.mode1v3
+*.mode2v3
+*.perspectivev3
+
+!default.pbxuser
+!default.mode1v3
+!default.mode2v3
+!default.perspectivev3
+
+xcuserdata
+
+*.moved-aside
+
+*.pyc
+*sync/
+Icon?
+.tags*
+
+/Flutter/Generated.xcconfig
+/Flutter/ephemeral/
+/Flutter/flutter_export_environment.sh

ios/Classes/KeyboardHeightPlugin.swift

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+import Flutter
+import UIKit
+
+public class KeyboardHeightPlugin: NSObject, FlutterPlugin, FlutterStreamHandler {
+  private var eventSink: FlutterEventSink?
+  private var eventChannel: FlutterEventChannel?
+
+  public static func register(with registrar: FlutterPluginRegistrar) {
+    let instance = KeyboardHeightPlugin()
+    instance.eventChannel = FlutterEventChannel(name: "keyboardHeightEventChannel", binaryMessenger: registrar.messenger())
+    instance.eventChannel?.setStreamHandler(instance)
+  }
+
+  public func onListen(withArguments arguments: Any?, eventSink events: @escaping FlutterEventSink) -> FlutterError? {
+    eventSink = events
+    registerKeyboardObservers()
+    return nil
+  }
+
+  public func onCancel(withArguments arguments: Any?) -> FlutterError? {
+    eventSink = nil
+    unregisterKeyboardObservers()
+    return nil
+  }
+
+  private func registerKeyboardObservers() {
+    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
+    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
+  }
+
+  private func unregisterKeyboardObservers() {
+    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
+    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
+  }
+
+  @objc private func keyboardWillShow(notification: NSNotification) {
+    if let userInfo = notification.userInfo,
+       let keyboardFrame = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect {
+      eventSink?(NSNumber(value: keyboardFrame.height))
+    }
+  }
+
+  @objc private func keyboardWillHide(notification: NSNotification) {
+    eventSink?(NSNumber(value: 0.0))
+  }
+}
+

ios/keyboard_height_plugin.podspec

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+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint keyboard_height_plugin.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name             = 'keyboard_height_plugin'
+  s.version          = '0.0.1'
+  s.summary          = 'A new Flutter plugin project.'
+  s.description      = <<-DESC
+A new Flutter plugin project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.dependency 'Flutter'
+  s.platform = :ios, '9.0'
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
+  s.swift_version = '5.0'
+end