An elegant Keyboard library for iOS

import CommonKeyboard

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        // Just enable a single line of code
        CommonKeyboard.shared.enabled = true

        return true
    }
}

 textField.keyboardOffset = 20
 textField.ignoredCommonKeyboard = true

 textView.keyboardOffset = 2
 textView.ignoredCommonKeyboard = false

import CommonKeyboard

class ExampleChatViewController: UIViewController {

    @IBOutlet var tableView: UITableView!
    @IBOutlet var bottomConstraint: NSLayoutConstraint!
    let keyboardObserver = CommonKeyboardObserver()

    override func viewDidLoad() {
        super.viewDidLoad()
        // drag down to dismiss keyboard
        tableView.keyboardDismissMode = .interactive

        keyboardObserver.subscribe(events: [.willChangeFrame, .dragDown]) { [weak self] (info) in
            guard let weakSelf = self else { return }
            var bottom = 0
            if info.isShowing {
                bottom = -info.visibleHeight
                if #available(iOS 11, *) {
                    bottom += weakSelf.view.safeAreaInsets.bottom
                }
            }
            UIView.animate(info, animations: { [weak self] in
                self?.bottomConstraint.constant = bottom
                self?.view.layoutIfNeeded()
            })
        }
    }

}

public enum CommonKeyboardObserverEvent {
    case willShow
    case didShow
    case willHide
    case didHide
    case willChangeFrame
    case didChangeFrame
    case dragDown // scroll.keyboardDismissMode = .interactive
}

extension ExampleChatViewController: CommonKeyboardContainerProtocol {
    var scrollViewContainer: UIScrollView {
        return tableView
    }
}

 // dismiss keyboard
 CommonKeyboard.shared.dismiss()

 // get current UIResponder
 let responder = CommonKeyboard.shared.currentResponder