NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
```
```
deinit{
         NSNotificationCenter.defaultCenter().removeObserver(self)
}
```

```
func keyboardWillShow(notification: NSNotification) {
        adjustInsetForKeyboardShow(true, notification: notification)
    }
func keyboardWillHide(notification: NSNotification) {
        adjustInsetForKeyboardShow(false, notification: notification)
    }
func adjustInsetForKeyboardShow(show:Bool,notification:NSNotification){
        let userInfo = notification.userInfo ?? [:]
        let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()
        let adjustmentHeight = (CGRectGetHeight(keyboardFrame)) * (show ? 1:-1)
        fgScrollview.contentInset.bottom += adjustmentHeight
        fgScrollview.scrollIndicatorInsets.bottom += adjustmentHeight    
}

```