UIScrollView scroll up on Keyboard - ios

Question

Problem Statement : I have Nib file of UIView contains UIScrollview, In scrollview I have several TextFields and a TextView at the Bottom. What I want is to scroll upward when textfield or Textview starts editing.
What I tried :
In custome Method
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
I am calling this method parent view.
Notification Handling:
func keyboardWasShown(notification: NSNotification)
{
var userInfo = notification.userInfo!
var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
keyboardFrame = self.convert(keyboardFrame, from: nil)
var contentInset:UIEdgeInsets = self.mainScroll.contentInset
contentInset.bottom = keyboardFrame.size.height
self.mainScroll.contentInset = contentInset
}
This is working perfectly for UITextFields, But not working UITextView. Any idea where is the mistake.
PS: I have set the Delegates of UITextField and UITextView as well.
Any help will be much appreciated.

Answer 1

Replace keyboardWasShown function with the below function :
func keyboardWasShown(notification: NSNotification)
{
var userInfo = notification.userInfo!
var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
keyboardFrame = self.convert(keyboardFrame, from: nil)
self.mainScroll.contentOffset = CGPoint(x: 0, y: keyboardFrame.size.height - Any number that fits your need.)
}
In keyBoardWillHide :
self.mainScroll.contentOffset = CGPoint(x: 0, y: 0)
Hope it will help.
Happy Coding!

Answer 2

Demo link : https://github.com/harshilkotecha/UIScrollViewWhenKeyboardAppearInSwift3
when you have multiple textview it is so difficult so best solution ->
step 1 : add UITextFieldDelegate
class ScrollViewController: UIViewController,UITextFieldDelegate {
step 2 :create new IBOutlet but don't connect with any text field
// get current text box when user Begin editing
#IBOutlet weak var activeTextField: UITextField?
step 3 : write this two method when user focus on text filed object pass the reference and store in activeTextField
// get current text field
func textFieldDidBeginEditing(_ textField: UITextField)
{
activeTextField=textField;
}
func textFieldDidEndEditing(_ textField: UITextField)
{
activeTextField=nil;
}
step 5 : set Notification in viewdidload setNotificationKeyboard
override func viewWillAppear(_ animated: Bool) {
// call method for keyboard notification
self.setNotificationKeyboard()
}
// Notification when keyboard show
func setNotificationKeyboard () {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(notification:)), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: .UIKeyboardWillHide, object: nil)
}
step 6 : two methods for hide and show keyboard
func keyboardWasShown(notification: NSNotification)
{
var info = notification.userInfo!
let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height+10, 0.0)
self.scrollView.contentInset = contentInsets
self.scrollView.scrollIndicatorInsets = contentInsets
var aRect : CGRect = self.view.frame
aRect.size.height -= keyboardSize!.height
if let activeField = self.activeTextField
{
if (!aRect.contains(activeField.frame.origin))
{
self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
}
}
}
// when keyboard hide reduce height of scroll view
func keyboardWillBeHidden(notification: NSNotification){
let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0,0.0, 0.0)
self.scrollView.contentInset = contentInsets
self.scrollView.scrollIndicatorInsets = contentInsets
self.view.endEditing(true)
}

Answer 3

Swift 5
NotificationCenter.default.addObserver(self, selector: #selector(keyboardNotification), name: UIResponder.keyboardDidChangeFrameNotification, object: nil)
#objc func keyboardNotification(_ notification: Notification) {
if let userInfo = (notification as NSNotification).userInfo {
let endFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
let duration:TimeInterval = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
let animationCurveRawNSN = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber
let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIView.AnimationOptions().rawValue
let animationCurve:UIView.AnimationOptions = UIView.AnimationOptions(rawValue: animationCurveRaw)
if (endFrame?.origin.y)! >= UIScreen.main.bounds.size.height {
scrollViewBottomConstraint?.constant = 0
} else {
if tabBarController?.tabBar.frame == nil {
return
}
scrollViewBottomConstraint?.constant = endFrame!.size.height - (tabBarController?.tabBar.frame.height)!
let bottomOffset = CGPoint(x: 0, y: 0)
scrollView.setContentOffset(bottomOffset, animated: true)
}
UIView.animate(withDuration: duration, delay: 0, options: animationCurve, animations: { self.view.layoutIfNeeded() }, completion: nil)
}
}
usage:
1.connect the scrollView outlet to your controller and set its name to 'scrollView'
2.connect the scrollView bottom constraint to your controller & set its name to 'scrollViewBottomConstraint'
3.put the notification observer to your ViewDidLoad function.