UIScrollView won't scroll?

It doesn't scroll because there's nothing to scroll. You told it your content size was exactly the same size as the scrollview itself, so it's already displaying everything. You can set the alwaysBounceHorizontal or alwaysBounceVertical properties if you want it to always bounce when trying to scroll, but that's about it.

The issue is the frame size (how large the actual view is) is the same as your content size (how large your content is). So if you make your frame's height less than your contentSize's height it will scroll.

Simple answer to your question change setContentSize line to contentScrollView setContentSize:CGSizeMake(600, 481).

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