ios - selectRowAtIndexPath 在 vi​​ewWillAppear 中失败

Question

I've got a menu that's a UITableview in a UIPopovercontroller that when selected scrolls the parent view's UIScollView to a specific frame.

效果很好。

问题是，如果您使用 pageControl 滚动框架，我需要更新表中的选定行 [_delegate returnPageNumber] 返回当前 pageControl.currentPage

没有错误，NSLog 报告了正确的页码:

scrollIndexPath is <NSIndexPath 0x1a3380> 2 indexes [0, 3]

但是正确的单元格没有突出显示...为什么？？？？

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    //[tableView reloadData];
    int isPage = [_delegate returnPageNumber];
    NSIndexPath *scrollIndexPath = [NSIndexPath indexPathForRow:(isPage) inSection:0];
    NSLog(@"scrollIndexPath is %@",scrollIndexPath);
    [tableView selectRowAtIndexPath:scrollIndexPath animated:NO scrollPosition:UITableViewScrollPositionNone];      
}

我试过将 [tableView reloadData] 放在 viewDidAppear 之前和之后，然后将代码放在 viewDidAppear 中......没有任何效果

Answer 1

尝试在 viewWillAppear 中调用 [super viewWillAppear]:

- (void)viewWillAppear:(BOOL)animated 
{

    NSIndexPath *selection = [self.tableView indexPathForSelectedRow];

    [[self tableView] reloadData];    


    if (selection)
    {
        [[self tableView] selectRowAtIndexPath:selection animated:NO scrollPosition:UITableViewScrollPositionNone];        
    }

    [super viewWillAppear:animated]; //Trick is calling super last in this case. Then you can  retrieve previously selected row to --> NSIndexPath *selection

}