iOS UITableView 滑动到指定位置

 NSIndexPath *curIndexPath = [NSIndexPath indexPathForRow:weakself.playIndex inSection:0]; 



 [weakself.myTableView scrollToRowAtIndexPath:curIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:NO];

 self.myTableView.estimatedRowHeight = 0;
    self.myTableView.estimatedSectionHeaderHeight = 0;
    self.myTableView.estimatedSectionFooterHeight = 0;

 /// 解决cell问题上移
        [weakself.myTableView setContentOffset:CGPointMake(0,self.playIndex*SK_ScreenHeight) animated:NO];