iPhone: UITableView not refreshing -

i have read many topics uitableviews not refreshing on iphone, couldn't find matching situation, i'm asking help.

in class, extends uiviewcontroller, have tableview , 'elementlist' (which wrapper nsmutablearray) used data source.

a separate thread adds new element array via 'updatelist:' method. when happens, want tableview refreshed automatically, doesn't happen.

by debugging app, can see 'cellforrowatindexpath' never called , can't figure out why.

i tried add observer, calls 'reloadtableview' method (it called) tableview not updated.

this code:

#import <uikit/uikit.h>  @interface listviewcontroller : uiviewcontroller <uitableviewdelegate, uitableviewdatasource> {     uitableview *tableview;     elementlist *elementlist;   // wrapper nsmutablearray }  // called else, triggers whole thing -(void)updatelist:(element *)element;  // added out of desperation -(void)reloadtableview;  @end   @implementation listviewcontroller  -(void)loadview {     // create tableview     tableview = [[uitableview alloc] initwithframe:[[uiscreen mainscreen] applicationframe] style:uitableviewstyleplain];     assert(tableview != nil);     tableview.delegate = self;     tableview.datasource = self;     [tableview reloaddata];      self.view = tableview;      // added out of desperation      [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(reloadtableview) name:@"updatedlistnotification" object:nil]; }  -(void)reloadtableview {     // try     [tableview reloaddata];     [tableview setneedslayout];     [tableview setneedsdisplay];     [tableview reloaddata];     [self.view setneedslayout];     [self.view setneedsdisplay]; }  // called else, triggers whole thing -(void)updatelist:(element *)element {     assert(element != nil);     [elementlist addelement:element];     [element release];      // notify observer, should update table view     [[nsnotificationcenter defaultcenter] postnotificationname:@"updatedlistnotification" object:self]; }  // tableview delegate protocol - (void)tableview:(uitableview *)table didselectrowatindexpath:(nsindexpath *)indexpath {     element *selected_element = [elementlist getelementatindex:indexpath.row];     if (selected_element == nil)     {         nslog(@"error: selected invalid element");         return;     }     [table deselectrowatindexpath:indexpath animated:yes];      nslog(@"selected %@", selected_element.name); }  // tableview data source protocol - (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     return 1; }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     return [elementlist count]; }  - (uitableviewcell *)tableview:(uitableview *)table cellforrowatindexpath:(nsindexpath *)indexpath {            static nsstring *cellidentifier = @"cell";     uitableviewcell *cell = [table dequeuereusablecellwithidentifier:cellidentifier];     if (cell == nil)     {     cell = [[[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier] autorelease];     }      // set cell label     cell.textlabel.text = [[elementlist getelementatindex:indexpath.row] name];     cell.textlabel.frame = cell.bounds;     cell.textlabel.textalignment = uitextalignmentleft;     return cell; }  @end 

any appreciated, thank you.

notifications executed in same thread caller. updating ui should done in main thread, should call -reloaddata on main thread:

-(void)updatelist:(element *)element {     assert(element != nil);     [elementlist addelement:element];      [self.tableview performselectoronmainthread:@selector(reloaddata) withobject:nil]; } 

also note shouldn't release object don't own. don't call [element release] in -updatelist method. release should called caller of function.