ios - Search for parse user to return multiple results -

i have uitableviewcontroller , in uisearchbar searches parse.com users. when search type "abc", want users string "abc" not closets match.

.h

@property (weak, nonatomic) iboutlet uisearchbar *searchbar; @property (nonatomic, strong) pfuser *founduser; @property (nonatomic, strong) pfrelation *friendsrelation; @property (nonatomic, strong) nsarray *allusers; @property (nonatomic, strong) pfuser *currentuser; 

.m

- (void)viewdidload {     [super viewdidload];      self.searchbar.delegate = self;  }  -(void)viewdidappear:(bool)animated{     [super viewdidappear:animated];      pfquery *query = [pfuser query];     [query orderbyascending:@"username"];     [query findobjectsinbackgroundwithblock:^(nsarray *objects, nserror *error){         if (error) {             nslog(@"error: %@ %@", error, [error userinfo]);         } else {             self.allusers = objects;             [self.tableview reloaddata];         }     }];      self.currentuser = [pfuser currentuser];  }  #pragma mark -search bar  - (void)searchbarcancelbuttonclicked:(uisearchbar *)searchbar {      //dismiss keyboard , reload table     [self.searchbar resignfirstresponder];     [self.tableview reloaddata]; }  - (void)searchbartextdidbeginediting:(uisearchbar *)searchbar {      //enable cancel button when user touches search field     self.searchbar.showscancelbutton = true; }  - (void)searchbartextdidendediting:(uisearchbar *)searchbar {      //disable cancel button when user ends editing     self.searchbar.showscancelbutton = false; }  - (void)searchbarsearchbuttonclicked:(uisearchbar *)searchbar {      //dismiss keyboard     [self.searchbar resignfirstresponder];      //reset founduser property     self.founduser = nil;      //strip whitespace off end of search text     nsstring *searchtext = [self.searchbar.text stringbytrimmingcharactersinset:[nscharacterset whitespaceandnewlinecharacterset]];      searchtext = [searchtext lowercasestring];      //check make sure field isnt empty , query parse username in text field     if (![searchtext isequaltostring:@""]) {          pfquery *query = [pfuser query];         [query wherekey:@"username" containsstring:searchtext];         [query findobjectsinbackgroundwithblock:^(nsarray *objects, nserror *error) {             if (!error) {                  //check make sure query found user                 if (objects.count > 0) {                      //set founduser property user found query (we use last object since array)                     self.founduser = objects.lastobject;                      //the query succesful returned no results. user not found, display error message                 } else {                  }                  //reload tableview after user searches                 [self.tableview reloaddata];              } else {                  //error occurred query              }          }];      } }  #pragma mark - table view data source  - (nsinteger)numberofsectionsintableview:(uitableview *)tableview {      // return number of sections.     if (self.founduser) {          return 1;      } else {          return 0;     }  }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {      // return number of rows in section.      if (self.founduser) {          return 1;      } else {          return 0;     }  } 

how can search string , retrieve users string?