Cell is not being rendered in UITableView after insert/delete cells - objective-c

Question

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:
...
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];
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:
before transition:
after transition:
My investigation showed that for some reason this cell has alpha = 0 after the last layoutSubviews call on UITableView.
I am stuck, I have no idea what is going on, so any help will be much appreciated.
UPDATE:
Here is my cellForRowAtIndexPath method:
- (UITableViewCell*) tableView :(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)cellForRowAtIndexPath {
IDataSourceElement item = [[self collection] getDataSourceElementAtIndex:cellForRowAtIndexPath.row];
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;
}
And MyTableCellBuilder buildCellForIndexPath: method implementation
- (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;
}
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?

Answer 1

show your cellForRowAtIndexPath method implementation, i'm sure that's where you should look for mistake.