Fade in/out UIScrollView's content like Mobile Safari does in its tab

Question

NOTE: I added my new solution at the UPDATE answer below.

I try to recreate the effects we saw in Mobile Safari\'s tab on iPhone/iPod touch.

Ba

Answer 1

As you'll have noticed from how often scrollViewDidScroll: is called, UIScrollView doesn't simply fire and forget a Core Animation transition: it manually moves the bounds according to touches, acceleration, etc. There's no straightforward way to change this.

However, if you're being swamped by scroll events, you might try a trick like the following:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    NSTimeInterval timestamp = [[NSDate date] timeIntervalSince1970];
    if (timestamp - _savedTimestamp) < 0.1)
        return;
    _savedTimestamp = timestamp;

    // do the rest of your work here
}

H