UITableView的scrollToRowAtIndexPath:atScrollPosition:animated的崩溃

[摘要：reason: '-[UITableView _contentOffsetForScrollingToRowAtIndexPath:atScrollPosition:]: row (0) beyond bounds (0) for section (0). 那个毛病是传进的IndexPath已越界了。须要正在挪用之前到场判别语句，没有影响机能的情]

 

reason: '-[UITableView _contentOffsetForScrollingToRowAtIndexPath:atScrollPosition:]: row (0) beyond bounds (0) for section (0).

这个错误是传入的IndexPath已经越界了。需要在调用之前加入判断语句，不影响性能的情况下，在调用之前要先reloadDate

代码示例：

@implementation UITableView(ScrollToTopOrBottom)

-(void)scrollToTopWithAnimated: (BOOL)animated{

    if([selfnumberOfSections]>&&[selfnumberOfRowsInSection: ]>){

        [selfscrollToRowAtIndexPath: [NSIndexPathindexPathForRow: 0inSection: ]atScrollPosition: UITableViewScrollPositionTopanimated: animated];

    }

}

-(void)scrollToBottomWithAnimated: (BOOL)animated{

    if([selfnumberOfSections]>){

        NSIntegerlastSectionIndex=[selfnumberOfSections]-;

        NSIntegerlastRowIndex=[selfnumberOfRowsInSection: lastSectionIndex ]-;

        if(lastRowIndex>){

            NSIndexPath*lastIndexPath=[NSIndexPathindexPathForRow: lastRowIndexinSection: lastSectionIndex];

            [selfscrollToRowAtIndexPath: lastIndexPathatScrollPosition: UITableViewScrollPositionBottomanimated: animated];

        }

    }

}@end