Adding views on top of UIScrollView

When you add a subView to UIScrollView, should this change the smoothness, or anything else for the UIScrollView? For example, if you have a UIScrollView with mainly text, then add a couple of views on top of it in order to add an effect t开发者_如何学Pythono the text, should this change any of the gestures, or smoothness of the original UIScrollView without the subViews? Thanks.

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It won't change the gestures.

As for the smoothness, it depends on how heavy your subviews are. I guess that if you add a lot of them, and they require to render a lot of dynamic content and such, it could make the scrolling a little rough, but if you are adding only a few subviews you should be fine.

As a comparison, think that a UITableView is a UIScrollView with a LOT of subviews on it (each cell is a subview, and cells have several subviews too), and it usually renders fast.

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If the sub views you implement have the worst drawRect: implementation in the world, you don't need very many views to get slow, un-smooth scrolling.

You should profile your code in Instruments with the Time Profiler, and see what causes the slow scrolling.