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