         return KeyboardOptions(belongsToCurrentApp: currentApp, startFrame: startFrame, endFrame: endFrame, animationCurve: animationCurve, animationDuration: animationDuration)
     }
     
+    
     // MARK: - UIKit notification handling
+    
     @objc private func keyboardWillShow(note: NSNotification) {
         if let callback = callbacks[.willShow] {
             callback(keyboardOptions(fromNotificationDictionary: note.userInfo))

        center.removeObserver(self)
    }
    
    fileprivate func keyboardOptions(fromNotificationDictionary userInfo: [AnyHashable : Any]?) -> KeyboardOptions {
        var currentApp = false
        if let value = (userInfo?[UIKeyboardIsLocalUserInfoKey] as? NSNumber)?.boolValue {
            currentApp = value

        case didChangeFrame
    }
    
    public func on(event: KeyboardEvent, do callback: TypistCallback?) -> Self {
        callbacks[event] = callback
        return self
