objective c - NSOutlineView crash on error EXC_BAD_ACCESS code=13 -

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i have nsoutlineview custom cell named listcell. set label , icon custom cell. nsoutlineview crash on error exc_bad_access code=13. have idea, how repair it? thx reply.

- (nsinteger)outlineview:(nsoutlineview *)outlineview numberofchildrenofitem:(id)item {   return [[[datasingleton shareddata] pages] count]; }  - (bool)outlineview:(nsoutlineview *)outlineview isitemexpandable:(id)item {   return no; }  - (id)outlineview:(nsoutlineview *)outlineview objectvaluefortablecolumn:(nstablecolumn *)tablecolumn byitem:(id)item {   return item; }  - (id)outlineview:(nsoutlineview *)outlineview child:(nsinteger)index ofitem:(id)item {   listtablecellview *cell = [outlineview makeviewwithidentifier:@"listcell" owner:self];    cell.label.stringvalue = [nsstring stringwithformat:@"%ld", index + 1];   [cell.label setbackgroundcolor:[nscolor clearcolor]];    if ([self.icons objectforkey:[nsstring stringwithformat:@"%ld", index]])     [[cell icon] setimage:[self.icons objectforkey:[nsstring stringwithformat:@"%ld", index]]];    return cell; }  - (bool)outlineview:(nsoutlineview *)outlineview shouldselectitem:(id)item {  return yes; }

these methods data source delegate methods. such should concerned handling data. doing here makes no sense me.

the view expect objects can use in table cell's setstringvalue: etc methods. giving custom cell in -outlineview:objectvaluefortablecolumn:byitem: going confuse it.

also, don't think handling counts properly. -outlineview:numberofchildrenofitem: should return count of sub items item passed in. index passed in -outlineview:child:ofitem: can anywhere between 0 , count - 1.

furthermore, think need ensure items return consistent between invocations of -reloaddata. so, if, say, view asks child 5 of item nil (nil means "root level" item) should consistently return same object each time. haven't seen documented anywhere, had similar problem once generating objects on fly.


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