iphone - TableView mix up the cells -

i have tableview static cells header has 4 cells, 1 cell in middle carries uiwebview , footer section comments. each comment has it's own cell. problem if footer has 4 or more comments, 4th cell in footer carries same uiwebview cell in middle.

my cellforrowatindexpath looks this:

// customize appearance of table view cells. - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      // cell     static nsstring *cellidentifier = @"cella";     uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     if (cell == nil) {         cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];         cell.selectionstyle = uitableviewcellselectionstylenone;     }      uitableviewcell *contentcell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     if (contentcell == nil) {         contentcell = [[customdetailtableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];     }        // display     cell.textlabel.textcolor = [uicolor blackcolor];     cell.textlabel.font = [uifont systemfontofsize:15];     if (item) {          // item info         nsstring *itemtitle = item.title ? [item.title stringbyconvertinghtmltoplaintext] : @"[no title]";          // display         switch (indexpath.section) {              case sectionheader: {                  // header                 switch (indexpath.row) {                      case sectionheadertitle:                         cell.textlabel.font = [uifont boldsystemfontofsize:15];                         cell.textlabel.text = itemtitle;                         cell.textlabel.numberoflines = 0; // multiline                         break;                     case sectionheaderdate:                         cell.textlabel.text = datestring ? datestring : @"[kein datum]";                         cell.imageview.image = nil;                         break;                     case sectionheadersharerfacebook:                         cell.textlabel.text = @"share on facebook";                         cell.imageview.image = [uiimage imagenamed:@"f_logo.png"];                         break;                     case sectionheadersharertwitter:                         cell.textlabel.text = @"share on twitter";                         cell.imageview.image = [uiimage imagenamed:@"twitter-bird-blue-on-white.png"];                 }                 break;              }             case sectiondetail: {                   //add webview cell                 if (webviewdidfinishload == true && indexpath.section != sectioncomments) {                     cgfloat contentheight = webview.scrollview.contentsize.height;                     webview.frame = cgrectmake(23, 10, 275, contentheight);                 } else {                     webview.frame = cgrectmake(23, 10, 275, 10);                 }                 cell.backgroundcolor = [uicolor whitecolor];                 [cell addsubview:webview];                  break;             }             case sectioncomments: {                  nsstring *writertext = [[[self.commentparser.commentsarray objectatindex:indexpath.row] name] stringbyappendingstring:@" schrieb:\n"];                 writertext = [writertext stringbyappendingstring:[[self.commentparser.commentsarray objectatindex:indexpath.row] description]];                 writertext = [writertext stringbyappendingformat:@"\n"];                 cell.textlabel.text = writertext;                 cell.imageview.image = nil;                 cell.textlabel.linebreakmode = uilinebreakmodewordwrap;                 cell.textlabel.numberoflines = 0; //multiline                   if (cell.textlabel.text == nil) {                     cell.textlabel.text = @"keine kommentare vorhanden";                     cell.textlabel.font = [uifont fontwithname:@"verdana-italic" size:12];                 }                 break;             }          }     return cell;     } } 

why uiwebview in 4th cell again, , how can change ?

thanks every answer!

the reason uitableview reuses it's cells conserve memory. there tons of questions on topic, recommend read (1, 2, ...). briefly, when do:

uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier]; 

for cell in footer section, cell in middle section contains uiwebview. need remove uiwebview subview before reuse cell in footer section.