I understand that this problem is incredibly common and I have read through quite a few answers but am having trouble understanding how the code works. This works:

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
if ([sender isEqual:txtLeaveAddyLine1])
{
    //move the main view, so that the keyboard does not hide it.
    if  (self.view.frame.origin.y >= 0)
    {
        [self setViewMovedUp:YES];
    }
} 
}

In this example, txtLeaveAddy is the very first UITextField that is hidden by the keyboard and it works like a charm. As I cycle through the text fields on the screen it scrolls up when the user enters into that txtLeaveAddyLine1 field. However, when I try to add the fields below the txtLeaveAddyLine1 field - nothing happens. For example:

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
    if ([sender isEqual:txtLeaveAddyLine1])
    {
        //move the main view, so that the keyboard does not hide it.
        if  (self.view.frame.origin.y >= 0)
        {
            [self setViewMovedUp:YES];
        }
    } 
    if ([sender isEqual:txtLeaveAddyLine2])
    {
        //move the main view, so that the keyboard does not hide it.
        if  (self.view.frame.origin.y >= 0)
        {
            [self setViewMovedUp:YES];
        }
    } 
}

Am I not using this function correctly?