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POCell is not being rendered in UITableView after insert/delete cells
 

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  1. POCell is not being rendered in UITableView after insert/delete cells
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    <p>I have a tableview which can work in 2 modes: read-only and read-write. In read-only mode table contains only 4 cells, in read-write mode - 8 cells. To transit between these 2 modes I have button with implemented action:</p> <pre><code>... NSArray* cellIndexesInCurrentMode = [self cellIndexesInMode:Mode1]; NSArray* cellIndexInNewMode = [self cellIndexesInMode:Mode2]; [self.tableView beginUpdates]; [self.tableView insertRowsAtIndexPaths: cellIndexInNewMode withRowAnimation:UITableViewRowAnimationFade]; [self.tableView deleteRowsAtIndexPaths:cellIndexesInCurrentMode withRowAnimation:UITableViewRowAnimationFade]; [self.tableView endUpdates]; </code></pre> <p>Everything works fine, until I scroll table down in read-write (8-cells), so it bounced up. After that, tapping on the button to transit to mode2 leads to situation when one of the cells are not renderred:</p> <pre><code> before transition: </code></pre> <p><img src="https://i.stack.imgur.com/LzRWF.png" alt="before transition:"></p> <pre><code> after transition: </code></pre> <p><img src="https://i.stack.imgur.com/VYmfk.png" alt="after transition:"></p> <p>My investigation showed that for some reason this cell has alpha = 0 after the last layoutSubviews call on UITableView.</p> <p>I am stuck, I have no idea what is going on, so any help will be much appreciated.</p> <p><strong>UPDATE:</strong> Here is my cellForRowAtIndexPath method: - (UITableViewCell*) tableView :(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)cellForRowAtIndexPath { IDataSourceElement item = [[self collection] getDataSourceElementAtIndex:cellForRowAtIndexPath.row];</p> <pre><code>MyTableCell* cell = nil; if ([item conformsToProtocol:@protocol(MyTableCellBuilder)]) { cell = [(MyTableCellBuilder)item tableView:tableView buildCellForIndexPath:cellForRowAtIndexPath]; } if (cell == nil) { Class cellClass = [self getCellClassForElement: item]; NSString* reuseId = [cellClass description]; cell = [tableView dequeueReusableCellWithIdentifier:reuseId]; if (!cell) { cell = [[[cellClass alloc] initWithReuseIdentifier :reuseId] autorelease]; } } [self fillCell:cell forTableView:tableView forIndexPath:cellForRowAtIndexPath]; return cell; </code></pre> <p>}</p> <p>And MyTableCellBuilder buildCellForIndexPath: method implementation</p> <pre><code>- (MyTableCell*) tableView :(UITableView*)tableView buildCellForIndexPath:(NSIndexPath*)buildCellForIndexPath { MyTableCell* cell = myTableCell; if ([cell isKindOfClass:[TextPropertyCell class]] == NO) { cell = (MyTableCell*)[tableView dequeueReusableCellWithIdentifier :[self cellReuseIdentifier]]; if ([cell isKindOfClass:[MyTableCell class]] == NO) { cell = [[[MyTableCell alloc] initWithReuseIdentifier :[self cellReuseIdentifier]] autorelease]; } [self prepareCell:cell]; } //cell setup ... ... return cell; } </code></pre> <p>My idea was that the problem with caching instance of UITableViewCell, I know that it is not best way to do, but anyway I had it. I tried to remove caching, so all I did I set myTableCell to nil, so it is never returned from this method. And... it helped! I don't know why and would really like to know the answer?</p>
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    1. USiKiR
    1. USiKiR
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      1. POCell is not being rendered in UITableView after insert/delete cells
      1. USCarl Veazey
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      1. VTUpMod
    3. VO
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      1. USApurv
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    1. COwhen the alpha is set to 0, it's hidden/invisible... set alpha to 1.. to make it visible again.
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      1. POCell is not being rendered in UITableView after insert/delete cells
      1. USJenn Eve
    2. CO:) thanks, but I want to know why it is set to 0 at first place
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      1. USiKiR
 

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