怎么修改从下往上翻滚为从上往下翻滚？

[wangsaizzy]

我这业务需求想从上往下翻滚，请问怎么修改从下往上翻滚为从上往下翻滚？ 谢谢

[wangsaizzy]

NSInteger nextItem = resetCurrentIndexPath.item - 1;
NSInteger nextSection = resetCurrentIndexPath.section;
if (nextItem == self.titleArr.count) {
nextItem = 0;
nextSection--;
}