iphone - iOS NSMutableArray sticking -

i'm trying populate uitableview array contains files in directory

//in header @property (strong, nonatomic) nsmutablearray *files; //in tableview:cellforrow:atindexpath: static nsstring *cellid = @"cell"; uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellid]; if (cell == nil) {     cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellid];     cell.textlabel.text = [_files objectatindex:indexpath.row]; } return cell; 

(_files set equal [[nsfilemanager defaultmanager] contentsofdirectoryatpath:[self downloadsdir]; prior method being called) works, , shows correct files. problem if add file directory, , use tableview reloaddata, new file added, title duplicate of file. example

table view before adding file

++++++++++++++++++++++++++ text.txt ++++++++++++++++++++++++++ testing.txt ++++++++++++++++++++++++++ 

table view after adding file othertest.txt

++++++++++++++++++++++++++ text.txt ++++++++++++++++++++++++++ testing.txt ++++++++++++++++++++++++++ testing.txt ++++++++++++++++++++++++++ 

it should be

++++++++++++++++++++++++++ text.txt ++++++++++++++++++++++++++ testing.txt ++++++++++++++++++++++++++ othertest.txt ++++++++++++++++++++++++++ 

if restart app, show correct files. reason this. know might wrong?

if (cell == nil) {     cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellid];     cell.textlabel.text = [_files objectatindex:indexpath.row]; } return cell; 

you're not setting cell label text except when allocate new cell. try instead:

if (cell == nil) {     cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellid]; } cell.textlabel.text = [_files objectatindex:indexpath.row]; return cell; 

same code, i've moved line set cell's text gets executed when reuse cell when create new one.