Databases
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POUITableViewRowData, numberOfSectionsInTableView
 

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  1. POUITableViewRowData, numberOfSectionsInTableView
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    <p>I was trying to understand why numberOfSectionsInTableView is being called multiple times each time I update my data source. From the stack trace in gdb, I see the following</p> <pre><code>#0 -[JobPickerTVC numberOfSectionsInTableView:] (self=0x4d61fe0, _cmd=0x6207f5, tableView=0x6034800) at JobPickerTVC.m:153 #1 0x003d66ff in -[UITableViewRowData(UITableViewRowDataPrivate) _updateNumSections] () #2 0x003d63b0 in -[UITableViewRowData invalidateAllSections] () #3 0x00299010 in -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] () #4 0x002891e8 in -[UITableView endUpdates] () #5 0x000050c8 in -[JobPickerTVC controllerDidChangeContent:] (self=0x4d61fe0, _cmd=0x17109d, controller=0x4da5e40) at JobPickerTVC.m:442 </code></pre> <p>followed by</p> <pre><code>#0 -[JobPickerTVC numberOfSectionsInTableView:] (self=0x4d61fe0, _cmd=0x6207f5, tableView=0x6034800) at JobPickerTVC.m:153 #1 0x003d66ff in -[UITableViewRowData(UITableViewRowDataPrivate) _updateNumSections] () #2 0x003d6417 in -[UITableViewRowData ensureAllSectionsAreValid] () #3 0x0029902e in -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] () #4 0x002891e8 in -[UITableView endUpdates] () #5 0x000050c8 in -[JobPickerTVC controllerDidChangeContent:] (self=0x4d61fe0, _cmd=0x17109d, controller=0x4da5e40) at JobPickerTVC.m:442 </code></pre> <p>From what I can tell, the code executes [UITableViewRowData <strong>invalidateAllSections</strong>] (line #2 of the first trace) and then [UITableViewRowData <strong>ensureAllSectionsAreValid</strong>] (line #2 of the second trace). Both of these end by calling [JobPickerTVC numberOfSectionsInTableView:]. So [JobPickerTVC numberOfSectionsInTableView:] is getting called twice. I would like to know why this is happening and what these operations are doing. </p> <p>There's one more call to numberOfSectionsInTableView for another reason, but I would like to understand these first. </p>
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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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