ios - UITableView's reloadData sometimes does not call numberOfRowsInSection -

[tableview reloaddata] not call numberofrowsinsection:(nsinteger)section

what write answer in stackoverflow if saw question this:

• be sure delegate , datasource connected perfectly.
• just in case check if calling main thread or not.

i tried answers before asking question.

i put following line in mytableview class (extended uitableview)

- (void)reloaddata{     nslog(@"mytableview (reloaddata) self.datasource: %@, delegate: %@, ismainthread: %d",self.datasource,self.delegate,[nsthread ismainthread]);      [super reloaddata];      [self.delegate performselector:@selector(tablereloaded:) withobject:self]; } 

i see called mainthread , datasource , delegate never nil.

i not curious why tableview not call cellforrow first has call numberofrows see if result > 0. however, doesn't call numberofrows too...

any ideas? can reason tableview giveup calling numberofrows function?

update: i've put new lines reloaddata function print fullstack see if being called tableview's own functions. result: called outside of tableview there shouldn't unexpected behaviour.

update2: "sometimes": have discovered problem after users started "sometimes" don't see changes in table. after that, tried hit run button in xcode continuouslly until app opens bug. (30% percentage of runs shows bug). when happens, until restart application, reloaddata never works again.

update3: put self.datasource==myexpectedviewcontroller , [self.datasource tableview:self numberofrowsinsection:0] see if delegates not nil maybe being cloned etc.. result true , numberofrows correctly returning>0. delegates correct , have more items zero.

update4: tried fresh uitableview (removing custom uitableview), got same results.

update5: i've put button on screen recreates table , sets delegates. whenever problem in question happens, hit button , starts work perfectly. so, there must breaks internals of uitableview invalidates every call reloaddata, still couldn't find it.