linphone-iphone/Linphone/Utils/KeyboardResponder.swift

import Foundation
import UIKit
import Combine

final class KeyboardResponder: ObservableObject {
	@Published var currentHeight: CGFloat = 0

	private var cancellables: Set<AnyCancellable> = []

	init() {
		let willShow = NotificationCenter.default.publisher(for: UIResponder.keyboardWillShowNotification)
			.map { notification -> CGFloat in
				(notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect)?.height ?? 0
			}

		let willHide = NotificationCenter.default.publisher(for: UIResponder.keyboardWillHideNotification)
			.map { _ in CGFloat(0) }

		Publishers.Merge(willShow, willHide)
			.receive(on: RunLoop.main)
			.assign(to: \.currentHeight, on: self)
			.store(in: &cancellables)
	}
}