iOS Keyboard Helpers

ViewController.m

-(void)viewWillAppear:(BOOL)animated {
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardShown:) name:UIKeyboardWillShowNotification object:nil];
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardHidden:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

#pragma mark -
#pragma mark Keyboard show/hide notifications
- (void)keyboardShown:(NSNotification *)notification
{
  CGSize keyboardSize = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
  [UIView animateWithDuration:0.15f animations:^{
    [self.view setFrame:CGRectMake(0, -keyboardSize.height, self.view.frame.size.width, self.view.frame.size.height)];
  }];
}

-(void)keyboardHidden:(NSNotification *)notification
{
  [UIView animateWithDuration:0.15f animations:^{
    [self.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
  }];
}

ViewController.swift

func viewWillAppear(animated: Bool) {
  NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardShown:"), name: UIKeyboardDidShowNotification, object: nil)
  NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardHidden:"), name:UIKeyboardDidHideNotification, object: nil)
}

func viewWillDisappear(animated: Bool) {
  NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardDidShowNotification, object: nil)
  NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardDidHideNotification, object: nil)
}

func keyboardShown(notification: NSNotification) {
  var keyboardSize = notification.userInfo?[UIKeyboardFrameEndUserInfoKey]?.CGRectValue().size
  UIView.animateWithDuration(0.15, animations: {
    self.view.frame.origin.y -= keyboardSize!.height
  })
}
  
func keyboardHidden(notification: NSNotification) {
  var keyboardSize = notification.userInfo?[UIKeyboardFrameEndUserInfoKey]?.CGRectValue().size
  UIView.animateWithDuration(0.15, animations: {
    self.view.frame.origin.y += keyboardSize!.height
  })
}