Moving UITextFields over the keyboard without a UIScrollView

I had a UIViewController with a couple of UITextFields attached to its default UIView and everything was fine. Later on, I added a couple more text fields, so I had to make sure all text fields are displayed properly when the keyboard shows up. I thought about using a UIScrollView or maybe a UITableView which scrolls naturally, but I thought I didn't have to change my controller just for that. I found these 2 posts [1, 2] on stackoverflow pretty useful, but I still had to tweak the code a little and here's what I got:

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [activeField resignFirstResponder];
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    activeField = textField;
    [self setViewMovedUp:YES];
    return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [activeField resignFirstResponder];
    [self setViewMovedUp:NO];
    activeField = nil;
    return YES;
}

- (void)setViewMovedUp:(BOOL)movedUp {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
 
    CGRect viewFrame = self.view.frame;
    CGRect textFieldFrame = [activeField convertRect:[activeField bounds] toView:self.view];
 
    if (movedUp) {
        viewFrame.origin.y = -textFieldFrame.origin.y/1.8;
    } else {
        viewFrame.origin.y = 0;
    }
    self.view.frame = viewFrame;
 
    [UIView commitAnimations];
}

Let me explain a couple of things here, first: activeField is a UIControl* instance variable I added to my UIVeiwController. second: you can replace (textFieldFrame.origin.y/1.8) with any function of (textFieldFrame.origin.y) that would do the job. Maybe you can try assigning certain offsets for each range of y values, but I preferred this neat form and the result was neat too.