UITableView的插入、删除和滚动

以下代码中dataArray是存储数据的数组，mainTableView是UITableView控件

1.在UITableView的最底部插入

-(void)loadTheLastCell

{

    int lastIndex = [dataArray count]-1;

    if(lastIndex>=0)

    {

        NSIndexPath *path = [NSIndexPath indexPathForRow:lastIndex inSection:0];

        NSArray* tArray = [NSArray arrayWithObject:path];

        [mainTableView insertRowsAtIndexPaths:tArray withRowAnimation:UITableViewRowAnimationBottom];
   }

}

2.删除UITableView的数据

-(void) deleteData
{
     NSRange tRange = NSMakeRange(0,2);
        [dataArray removeObjectsInRange:tRange];
        
        NSIndexPath *path0 = [NSIndexPath indexPathForRow:0 inSection:0];
        NSIndexPath *path1 = [NSIndexPath indexPathForRow:1 inSection:0];
        
        NSArray* tArray = [NSArray arrayWithObjects:path0,path1,nil];
        [mainTableView deleteRowsAtIndexPaths:tArray withRowAnimation:UITableViewRowAnimationBottom];

} 

3.滚动到UITableView的最底部

-(void)delayScrollToBottom
{
    int lastIndex = [dataArray count]-1;
    if(lastIndex)
    {
        NSIndexPath *path = [NSIndexPath indexPathForRow:lastIndex inSection:0];
        [mainTableView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionTop animated:YES];
    }
}