[ios] How do I scroll the UIScrollView when the keyboard appears?

I used this answer supplied by Sudheer Palchuri https://stackoverflow.com/users/2873919/sudheer-palchuri https://stackoverflow.com/a/32583809/6193496

In ViewDidLoad, register the notifications:

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(DetailsViewController.keyboardWillShow(_:)), name:UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(DetailsViewController.keyboardWillHide(_:)), name:UIKeyboardWillHideNotification, object: nil)

Add below observer methods which does the automatic scrolling when keyboard appears.

func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}

func keyboardWillShow(notification:NSNotification){

var userInfo = notification.userInfo!
var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
keyboardFrame = self.view.convertRect(keyboardFrame, fromView: nil)

var contentInset:UIEdgeInsets = self.scrollView.contentInset
contentInset.bottom = keyboardFrame.size.height
self.scrollView.contentInset = contentInset
}

func keyboardWillHide(notification:NSNotification){

var contentInset:UIEdgeInsets = UIEdgeInsetsZero
self.scrollView.contentInset = contentInset
}

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