if (ios_Vewsion_5_Or_Above) {
_scrollView.bounces = NO;
} else {
for (id subview in _scrollView.subviews)
if ([[subview class] isSubclassOfClass: [UIScrollView class]])
((UIScrollView *)subview).bounces = NO;
}
原文：http://www.cnblogs.com/gcczhongduan/p/4481625.html