视图显示前立即滚动到表中的行 [英] Scroll immediately to row in table before view shows

问题描述

具有表格的视图被推送到屏幕上，我希望它在屏幕实际显示之前滚动到表格中的某一行。我在最终的视图控制器中使用这个代码。

A view with a table gets pushed onto the screen and I want it to scroll to a certain row in the table before the screen actually displays. I use this code within the final viewcontroller.

NSIndexPath *scrollToPath = [NSIndexPath indexPathForRow:5 inSection:0]; 
[theTable scrollToRowAtIndexPath:scrollToPath atScrollPosition:UITableViewScrollPositionTop animated:NO];

当我把它放在viewDiDAppear方法中时，它从表的初始位置顶部）到我想要的行。我不想让它显示初始位置。如果我把它放在viewDidLoad或viewWillAppear然后它崩溃与一个NSRangeException，可能是因为该表尚未设置。

When I put it in viewDiDAppear method, then it briefly flashes from the intial position of the table (at the top) to the row I want. I don't want it to show the initial position. If I put it in viewDidLoad or viewWillAppear then it crashes with a NSRangeException, presumably because the table isn't set up yet.

如何让它滚动而不显示初始位置？

How would I get it to scroll without showing the initial position?

推荐答案

感谢Shaggy和Dying仙人掌指向我的方向。答案是加载表并滚动到viewWillAppear：

Thanks to Shaggy and Dying Cactus for pointing me in the right direction. The answer is to load the table and scroll in viewWillAppear:

-(void)viewWillAppear:(BOOL)animated
{
    [theTable reloadData];
    NSIndexPath *scrollToPath = [NSIndexPath indexPathForRow:5 inSection:0]; 
    [theTable scrollToRowAtIndexPath:scrollToPath atScrollPosition:UITableViewScrollPositionTop animated:NO];   
}

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