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POProblem with editing style when inserting a new row at top of UITableView as part of entering Edit mode
 

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  1. POProblem with editing style when inserting a new row at top of UITableView as part of entering Edit mode
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    <p>I have a <code>UITableView</code> with a single section and 'n' rows (populated from an <code>NSMutableArray</code>, <code>myTableArray</code>). When entering Edit mode, I would like to achieve the following:</p> <ul> <li>setup the "n" rows to have the <code>UITableViewCellEditingStyleDelete</code> editing style</li> <li>insert a new row, above the original 'n', and set it up to have the <code>UITableViewCellEditingStyleInsert</code> editing style</li> </ul> <p>My <code>UITableViewController</code> subclass is implemented as follows:</p> <pre><code>- (void)setEditing:(BOOL)flag animated:(BOOL)animated { [super setEditing:flag animated:animated]; UITableView *tableView = (UITableView *)self.view; NSArray *topIndexPath = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:0]]; if (self.editing == YES) [tableView insertRowsAtIndexPaths:topIndexPath withRowAnimation:UITableViewRowAnimationBottom]; else [tableView deleteRowsAtIndexPaths:topIndexPath withRowAnimation:UITableViewRowAnimationBottom]; } - (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.row == 0) return UITableViewCellEditingStyleInsert; else return UITableViewCellEditingStyleDelete; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (self.editing == YES) return [myTableArray count] + 1; else return [myTableArray count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // ... boiler-plate dequeueReusableCellWithIdentifier code, etc ... if (self.editing == YES) { if (indexPath.row == 0) cell.textLabel.text = @"My new row"; else cell.textLabel.text = [myTableArray objectAtIndex:(indexPath.row - 1)]; } else { cell.textLabel.text = [myTableArray objectAtIndex:indexPath.row]; } return cell; } </code></pre> <p>When this code is run, and the Edit button is pressed, a new row is inserted above the original 'n' rows, however, the second row, in addition to the first, has the <code>UITableViewCellEditingStyleInsert</code> editing style. For example, if 'n' is 3, after the Edit button is pressed the table displays:</p> <ul> <li>row 0: insert editing style</li> <li>row 1: insert editing style (should be delete)</li> <li>row 2: delete editing style</li> <li>row 3: delete editing style</li> </ul> <p>After further investigation, I've noticed that if 'n' is 3 and the Edit button is pressed, the method <code>tableView:editingStyleForRowAtIndexPath:</code> is called a total of 8 times:</p> <ul> <li><code>[super setEditing:flag animated:animated]</code> results in 3 calls for each of the original rows 0, 1 and 2</li> <li>the subsequent <code>[tableView insertRowsAtIndexPaths:topIndexPath withRowAnimation:UITableViewRowAnimationBottom]</code> results in 5 calls for rows 0, 1, 2, 3, and then 0 again</li> </ul> <p>I can understand that the editing style needs to be re-corrected as a result of inserting a new row, however I do not understand why in the last 5 calls, row 0 is set twice and why row 1 still manages to have the incorrect style.</p> <p>Does anyone have any insight?</p>
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