I created a custom UIScrollView subclass that works a like a UITableView, keeping a collection of subviews and re-using them whenever the user scrolls. It's implemented like this:

-(void)layoutSubviews {
  for(UIView *subview in [self subviews])
    [subview removeFromSuperview];

  // then re-add subviews after changing the frame and some attributes
}

This works fine with simple UIViews, but when I try to do it with a UIView that has a UILabel subview, the "base" view appears fine, but the UILabel doesn't show up at all. I can get the UILabel to show up by scrolling the entire UIView off screen and then bringing it back on. What could be causing this?

So far, I've tried calling [myUIView setNeedsLayout], [myUIView setNeedsDisplay], and [myUIView layoutIfNeeded] from various places. None of them worked, and the last one crashed my app. I've also done the same thing to myUIScrollViewSubclass, with similar results.