Problem with scrollview, it scrolls more - iphone

Question

I have a scrollView and i want to scroll it automatically when i select an textField
(i am filling a form here)
i am using following method to scroll it
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
[scrollView setContentOffset:CGPointMake(0,50*(textField.tag-1))];
}
Now the problem is that i have more than 10 text fields and when i reached to the seventh textField the scrollView scrolls more .
I also tried to print the CGPointMake()'s values...and it is showing correct values..but the scroller goes beyond the range what is expected..
Look at following images
The following 2 images showing control on textFields tag <7
But when control reaches to 7th textField it scrolls more
and after this it goes beyond bounds.
This problem occurs only when i move from one textFields to another without pressing that return button(i mean with resignFirstResponder).But when i press that return button and then go to the next field then all works fine.
Can anyone suggest where should be the problem..?

Answer 1

It won't scroll because it doesn't contain enough content. It will stop when the bottom edge of the content reaches the bottom end of the frame. Use something like
CGSize size = scrollView.contentSize;
scrollView.contentSize = CGSizeMake (size.width, size.height + ADDITIONAL_HEIGHT);
when setting up the scroll view, or in your -viewDidLoad: method, if it was loaded from a XIB.

Answer 2

It should keep the text field being edited on the screen - i.e. scroll automatically - so you shouldn't need to do anything?
However, it might be trying to edit a text field that is behind the keyboard - so the better solution would be:
//Get notifications of the keyboard opening and closing
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
- (void)keyboardWillShow:(NSNotification *)notification {
//Get the keyboard height
int h = [self.view convertRect:[[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue] toView:nil].size.height;
//Change the inset of the scroll view and scroll bars
scrollView.contentInset = scrollView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 0, h, 0);
}
- (void)keyboardWillHide:(NSNotification *)notification {
scrollView.contentInset = scrollView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}

Answer 3

try this.declare a variable
CGPoint svos;
in .h file and do this.
- (void)textFieldDidBeginEditing:(UITextField *)textField {
svos = scr.contentOffset;//scr is my scroll view
CGPoint pt;
CGRect rc = [textField bounds];
rc = [textField convertRect:rc toView:scr];
pt = rc.origin;
pt.x = 0;
pt.y -= 60;
[scr setContentOffset:pt animated:YES];
//NSLog(#"%f",pt.y);
}