iPhone dev Stupidity 94: Delete content of scrollview when scroll

If you delete the content view of a UIScrollView in:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

later there's still some animation work need to be done by cocoa, and the error will happen (note that ScrollerHeartbeatCallback):

A Hack to solve - delayed remove:

// !!! a hack

// directly remove container from superview, later there's some heart beat callback for smoothing the scrolling

// which will still trying to use the old scroller, and when fails to find, there'll be a BAD ACCESS failure

// here we just delay the remove.

container.alpha = 0.0;

[container performSelector: @selector(removeFromSuperview) withObject: nil afterDelay: 0.1];