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POGet notified when UITableView has finished asking for data?
 

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  1. POGet notified when UITableView has finished asking for data?
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    <p>Is there some way to find out when a <code>UITableView</code> has finished asking for data from its data source?</p> <p>None of the <code>viewDidLoad</code>/<code>viewWillAppear</code>/<code>viewDidAppear</code> methods of the associated view controller (<code>UITableViewController</code>) are of use here, as they all fire too early. None of them (entirely understandably) guarantee that queries to the data source have finished for the time being (eg, until the view is scrolled).</p> <p>One workaround I have found is to call <code>reloadData</code> in <code>viewDidAppear</code>, since, when <code>reloadData</code> returns, the table view <em>is</em> guaranteed to have finished querying the data source as much as it needs to for the time being.</p> <p>However, this seems rather nasty, as I assume it is causing the data source to be asked for the same information twice (once automatically, and once because of the <code>reloadData</code> call) when it is first loaded.</p> <p>The reason I want to do this at all is that I want to preserve the scroll position of the <code>UITableView</code> - but right down to the pixel level, not just to the nearest row.</p> <p>When restoring the scroll position (using <code>scrollRectToVisible:animated:</code>), I need the table view to already have sufficient data in it, or else the <code>scrollRectToVisible:animated:</code> method call does nothing (which is what happens if you place the call on its own in any of <code>viewDidLoad</code>, <code>viewWillAppear</code> or <code>viewDidAppear</code>).</p>
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    1. USLeo Dabus
    1. USkennethmac2000
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    1. COIt seems that you are looking something similar to this http://stackoverflow.com/a/11672379/2082172 .
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      1. USTimur Kuchkarov
    2. COIn my experience, UITableView can cache calls to reloadData, just like it caches calls to insert/delete rows and other things. UITableView will call the data source delegate when it gets ready, depending on cpu usage and other things.
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      1. USWalt Sellers
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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