ios - How to select all uitableview cells on button click -

i making app in using buttons in form of checkboxes in uitableview cell.i changing images on checkbox select , unselect state. want when click on button cells of table view select , image of checkboxes of cells changed? how can done below sample code

- (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     return self.lblarray.count;  }    - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      static nsstring *tableviewidentifier = @"cell";     tablecelltableviewcell *cell= [self.tblvie dequeuereusablecellwithidentifier:tableviewidentifier];      if(cell==nil)     {         cell = [[tablecelltableviewcell alloc] initwithstyle:uitableviewcellstylesubtitle reuseidentifier:tableviewidentifier];     }      cell.lblimage.layer.cornerradius=3.0f;     cell.lblimage.layer.borderwidth=1.0f;     cell.backgroundcolor=[uicolor colorwithred:(245/255.0) green:(245/255.0) blue:(245/255.0) alpha:1];        if ([self.checkimagearray containsobject:[self.lblarray objectatindex:indexpath.row]])     {          [cell.buttoncheckbox setimage:[uiimage imagenamed:@"check_box_ok.png"]                      forstate:uicontrolstatenormal];      }     else     {         [cell.buttoncheckbox setimage:[uiimage imagenamed:@"uncheck.png"]                              forstate:uicontrolstatenormal];      }      cell.buttoncheckbox.tag=indexpath.row;     [cell.buttoncheckbox addtarget:self action:@selector(checkbutton:) forcontrolevents:uicontroleventtouchupinside];          cell.lbltext.text=[self.lblarray objectatindex:indexpath.row];      return cell;  }  -(ibaction)checkbutton:(uibutton *)sender {     cgpoint buttonposition = [sender convertpoint:cgpointzero toview:self.tblvie];     nsindexpath *indexpath = [self.tblvie indexpathforrowatpoint:buttonposition];       if ([self.checkimagearray containsobject:[self.lblarray objectatindex:indexpath.row]]) {         [self.checkimagearray removeobject:[self.lblarray objectatindex:indexpath.row]];         self.titlelabel.text=@"";             }     else {         [self.checkimagearray addobject:[self.lblarray objectatindex:indexpath.row]];                 self.titlelabel.text=[self.lblarray objectatindex:sender.tag];      }     [self.tblvie reloadrowsatindexpaths:[nsarray arraywithobject:indexpath] withrowanimation: uitableviewrowanimationfade];   } 

and here button in click cells of tableview select , images of cells changed not working

- (ibaction)selectbtns:(id)sender {     static nsstring *tableviewidentifier = @"cell";     tablecelltableviewcell *cell= [self.tblvie dequeuereusablecellwithidentifier:tableviewidentifier];     [cell.buttoncheckbox setimage:[uiimage imagenamed:@"check_box_ok.png"]                          forstate:uicontrolstatenormal];      } 

nsmutablearray *totalcheckmarkarray; //add on nsmutablearray in globally  - (void)viewdidload    {  totalcheckmarkarray =[[nsmutablearray alloc]init];   (int i=0; i<[self.lblarray count]; i++) // number of rows count {  [self.totalcheckmarkarray addobject:@"no"]; }  }    -(uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath  {  static nsstring *tableviewidentifier = @"cell"; tablecelltableviewcell *cell= [self.tblvie dequeuereusablecellwithidentifier:tableviewidentifier];  if(cell==nil) {     cell = [[tablecelltableviewcell alloc] initwithstyle:uitableviewcellstylesubtitle reuseidentifier:tableviewidentifier]; }  cell.lblimage.layer.cornerradius=3.0f; cell.lblimage.layer.borderwidth=1.0f;   if(![[self.totalcheckmarkarray objectatindex:indexpath.row] isequaltostring:@"no"]) {      [cell.buttoncheckbox setimage:[uiimage imagenamed:@"check_box_ok.png"] forstate:uicontrolstatenormal];  }  else if ([self.checkimagearray containsobject:[self.lblarray objectatindex:indexpath.row]]) {      [cell.buttoncheckbox setimage:[uiimage imagenamed:@"check_box_ok.png"] forstate:uicontrolstatenormal];  } else {     [cell.buttoncheckbox setimage:[uiimage imagenamed:@"uncheck.png"] forstate:uicontrolstatenormal]; }  cell.buttoncheckbox.tag=indexpath.row; [cell.buttoncheckbox addtarget:self action:@selector(checkbutton:) forcontrolevents:uicontroleventtouchupinside];  cell.lbltext.text=[self.lblarray objectatindex:indexpath.row];  return cell;  } 

selectall checkbox

- (ibaction)selectbtns:(id)sender {    (int i=0; i<[self.lblarray count]; i++)  {  [totalcheckmarkarray replaceobjectatindex:i withobject:@"yes"];   }  [self.tblvie reloaddata];    } 

deselectall checkbox

-(ibaction)deselectall_btnclick:(id)sender {   (int i=0; i<[self.lblarray count]; i++)  {  [totalcheckmarkarray replaceobjectatindex:i withobject:@"no"];   }  [self.tblvie reloaddata];  }