UPDATE FOR iOS 7
[self.scrollView setContentOffset: CGPointMake(0, -self.scrollView.contentInset.top) animated:YES];
ORIGINAL
[self.scrollView setContentOffset:CGPointZero animated:YES];
UPDATE FOR iOS 7
[self.scrollView setContentOffset: CGPointMake(0, -self.scrollView.contentInset.top) animated:YES];
ORIGINAL
[self.scrollView setContentOffset:CGPointZero animated:YES];
本文标题：scrollToTop，contentoffset不一定是置为C
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