Move visibility of UIScrollView area automatically - ios

Question

I want to make my view automatically moving up if keyboard appears. Already use apple's code here and it works well.
This is how I manage my object, so I create a UIScrollView that covers UIView. This UIView consists of UITextField and UIButton.
This is how I adjust my view when keyboard appears.
#pragma mark - Keyboard Handling
// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
}
// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
_scrollView.contentInset = contentInsets;
_scrollView.scrollIndicatorInsets = contentInsets;
// If active text field is hidden by keyboard, scroll it so it's visible
// Your app might not need or want this behavior.
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, _mainView.frame.origin) ) {
[self.scrollView scrollRectToVisible:_mainView.frame animated:YES];
}
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
_scrollView.contentInset = contentInsets;
_scrollView.scrollIndicatorInsets = contentInsets;
}
But I think there is a point that make that weird. When keyboard showed up, it scrolls and my UITextField become visible. But I thought it was too tight.
In my opinion, it would be better if my UITextField moving up a little bit. My question is, how can I set its scroll visibility? It looks like some variable should be added with some constant here
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, _mainView.frame.origin) ) {
[self.scrollView scrollRectToVisible:_mainView.frame animated:YES];
}
Note:
Result that I wanted
Thank you so much, a little hint would be appreciated.

Answer 1

The simplest solution would be to move your view (or scrollview) up when keyboard opens.
- (void)keyboardWillShow:(NSNotification*)notification{
[self.view setFrame:CGRectMake(0,-100, self.view.frame.size.width, self.view.frame.size.height)]; // where 100 is the offset
[self.view setNeedsDisplay];
}
- (void)keyBoardWillHide:(NSNotification*)notification{
[self.view setFrame:CGRectMake(0,0, self.view.frame.size.width, self.view.frame.size.height)];
[self.view setNeedsDisplay];
}

Answer 2

Solved
I solved this by manage its content inset by adding some number.
In keyboardWasShown:, I added its content inset by height of my textfield and button. Let say it was 100 total, so this is it.
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height+100, 0.0);
Thank you so much.