ios - UITableView shows wrong cell contents -

i've stucked uitableview , adding cells.

i have chat-app based on uitableview displaying messages. works fine when user opens chat old messages. when user adds new message - cell message populated wrong content.

i use custom cell displaying messages.here code (simplified):

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     // im using storyboard, don't need if (!cell) part     rightmessagecell *cell =  (rightmessagecell *) [self.messagetableview dequeuereusablecellwithidentifier:@"right_text_message"];      [self configurecell:cell forindexpath:indexpath];      return cell; }  - (cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath {     [self configurecell:self.offscreencell forindexpath:indexpath];      [self.offscreencell setneedslayout];      [self.offscreencell layoutifneeded];       result = [self.offscreencell.contentview systemlayoutsizefittingsize:uilayoutfittingcompressedsize].height; }  - (void) configurecell:(rightmessagecell *) cell forindexpath:(nsindexpath *) indexpath {     chatmessagemodel *message = [self.fetchcontroller objectatindexpath:indexpath];      rightmessagecell.messagetextview.text = message.messagetext; } 

and frc methods:

#pragma mark - nsfetchedresultscontrollerdelegate - (void)controllerwillchangecontent:(nsfetchedresultscontroller *)controller {     [self.messagetableview beginupdates]; }  - (void)controller:(nsfetchedresultscontroller *)controller didchangeobject:(id)anobject atindexpath:(nsindexpath *)indexpath forchangetype:(nsfetchedresultschangetype)type newindexpath:(nsindexpath *)newindexpath {     switch(type) {         case nsfetchedresultschangeinsert:             [self.messagetableview insertrowsatindexpaths:[nsarray arraywithobject:newindexpath] withrowanimation:uitableviewrowanimationnone];             break;          case nsfetchedresultschangedelete:             [self.messagetableview deleterowsatindexpaths:[nsarray arraywithobject:indexpath] withrowanimation:uitableviewrowanimationnone];             break;          case nsfetchedresultschangeupdate:             [self.messagetableview reloadrowsatindexpaths:[nsarray arraywithobject:indexpath] withrowanimation:uitableviewrowanimationnone];             break;     } }  - (void)controllerdidchangecontent:(nsfetchedresultscontroller *)controller {     [self.messagetableview endupdates]; } 

but can't figure out why newly created cells comes previous cells content , replace own content when redrawn (for ex when scroll , down)

in uitableviewcell subclass need implement method:

-(void)prepareforreuse {     [super prepareforresuse];     [self.textlabel settext:nil];     // reset layout     // reset text on labels     // reset other properties such images or text colour } 

this called before uitableviewcell reused, chance reset content/layout default.

another area see there's issue cell vs rightmessagecell here:

- (void) configurecell:(rightmessagecell *) cell forindexpath:(nsindexpath *) indexpath {     chatmessagemodel *message = [self.fetchcontroller objectatindexpath:indexpath];      rightmessagecell.messagetextview.text = message.messagetext; } 

your code shouldn't able compile above method.