UIScrollview setContentOffset with non linear animation?

Question

Every time you make your own animations you have to pass NO as animated: parameter:

- (void)scrollToPage:(int)page
{
    UIScrollView *scrollView = contentView;
    CGPoint offset = CGPointMake(scrollView.bounds.size.width * page, 
                                 scrollView.contentOffset.y);

    [UIView animateWithDuration:.5
                          delay:0
                        options:UIViewAnimationCurveEaseInOut
                     animations:^{
                         [scrollView setContentOffset:offset animated:NO];
                     } completion:nil];

    [self pageControlUpdate];
}

With the use of public APIs, I don't believe this is currently possible. Assuming you don't need user interaction during the course of the animation, you'd be better off animating the position of your UIScrollView's subviews (ie. the scroll view's content) instead, and then adjusting the contentOffset without animation on completion. You could do it like so:

- (void) scrollToPage:(int)page {
    UIScrollView *scrollView = contentView;
    scrollView.userInteractionEnabled = NO;
    CGPoint offset = CGPointMake(scrollView.bounds.size.width * page, scrollView.contentOffset.y);
    CGFloat delta = offset.x - scrollView.contentOffset.x;

    __block int animationCount = 0;
    for (UIView *view in scrollView.subviews) {
        [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
            animationCount++;
            CGRect frame = view.frame;
            frame.origin.x -= delta;
            view.frame = frame;
        } completion:^(BOOL finished) {
            animationCount--;
            if (animationCount == 0) {
                scrollView.contentOffset = offset;
                for (UIView *view in scrollView.subviews) {
                    CGRect frame = view.frame;
                    frame.origin.x += delta;
                    view.frame = frame;
                }
                scrollView.userInteractionEnabled = YES;
            }
        }];
    }
}

I can confirm this works as expected, I tested it myself.

[UIView animateWithDuration:(Animation_Duration)
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                     [scroll setContentOffset:CGPointMake(PointX, PointY) animated:NO];
                      }
                     completion:^(BOOL finished){}];`

This class absolutely saved my life:

MOScroll on GitHub.com

It has

- (void)setContentOffset:(CGPoint)contentOffset withTimingFunction:(CAMediaTimingFunction *)timingFunction duration:(CFTimeInterval)duration;

Just like the private API but with all public methods and math.