ios - UICollectionView move cells reverts after clicking a cell -


i have collectionview interactive cells, using long press gesture recognizer on cells allow user re-arrange them.

now re-arrange working issue have once cells have been re-arranged if click on 1 of cells revert positions in before re-arrange occured.

i have feeling has datasource im not sure.

this long press gesture re-arranges cells.

-(ibaction)longpressgesturerecognized:(id)sender {  uilongpressgesturerecognizer *longpress = (uilongpressgesturerecognizer *)sender; uigesturerecognizerstate state = longpress.state;  cgpoint location = [longpress locationinview:self.collectionview]; nsindexpath *indexpath = [self.collectionview indexpathforitematpoint:location];  static uiview *snapshot = nil; static nsindexpath *sourceindexpath = nil;  switch (state) {     case uigesturerecognizerstatebegan: {         if (indexpath) {             sourceindexpath = indexpath;              uicollectionviewcell *cell = [self.collectionview cellforitematindexpath:indexpath];              snapshot = [self customsnapshotfromview:cell];              cgpoint center = cell.center;             snapshot.center = center;             snapshot.alpha = 0.0;             [self.collectionview addsubview:snapshot];             [uiview animatewithduration:0.25 animations:^{                   snapshot.center = center;                 snapshot.transform = cgaffinetransformmakescale(1.05, 1.05);                 snapshot.alpha = 0.98;                  cell.hidden = yes;             } completion:nil];         }         break;     }     case uigesturerecognizerstatechanged: {         cgpoint center = snapshot.center;         center.y = location.y;         snapshot.center = center;          if (indexpath && ![indexpath isequal:sourceindexpath]) {             [people2 exchangeobjectatindex:indexpath.row withobjectatindex:sourceindexpath.row];             [self.collectionview moveitematindexpath:sourceindexpath toindexpath:indexpath];             sourceindexpath = indexpath;         }         break;     }     default: {         uicollectionviewcell *cell = [self.collectionview cellforitematindexpath:sourceindexpath];         [uiview animatewithduration:0.25 animations:^{              snapshot.center = cell.center;             snapshot.transform = cgaffinetransformidentity;             snapshot.alpha = 0.0;             cell.hidden = no;          } completion:^(bool finished){             [snapshot removefromsuperview];             snapshot = nil;            }];         sourceindexpath = nil;         break;     } }

}

i using nsnotification reload cells on click event.

-(void)handlereload:(nsnotification *)notification { nslog(@"notification recieved"); people2 = [databaseclass getdata]; [self.collectionview reloaddata];

}

any hugely appreciated.

edit: [databaseclass getdata] method - 

+(nsmutablearray*)getdata { [self databaseinit];  peoplearray = [[nsmutablearray alloc] init];  if (sqlite3_open(dbpath, &peopledb)== sqlite_ok) {      nsstring *selectsql = @"select id, name, points, colour people";     sqlite3_prepare_v2(peopledb,[selectsql utf8string],-1,&statement,null);          while (sqlite3_step(statement)== sqlite_row)         {             personobject *newperson = [[personobject alloc]init];             newperson.id = [[nsstring stringwithutf8string:(char *)sqlite3_column_text(statement, 0)]integervalue];             newperson.name = [nsstring stringwithutf8string:(char *)sqlite3_column_text(statement, 1)];             newperson.points = [[nsstring stringwithutf8string:(char *)sqlite3_column_text(statement, 2)] integervalue];             newperson.colour = [nsstring stringwithutf8string:(char *)sqlite3_column_text(statement, 3)];             [peoplearray addobject:newperson];          }      }      sqlite3_finalize(statement);     sqlite3_close(peopledb);  return peoplearray;

}

you don't show how getting data, [databaseclass getdata]; suggests database table. if re-reading database people2 array order of data in array revert order returned database query.


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