ios - How do i get numberOfRowsInSection from nested NSMutableDictionary? -

i trying follow post http://www.appcoda.com/ios-programming-index-list-uitableview/ create sections using uitableviewcontroller.

i using 2 nsmutabledictionaries first(_curateditemdictionary) dictionary store key value pairs parse , second (_sectionsdictionary) store these in dictionary key , values category type.

 [_sectionsdictionary setobject:[obj objectforkey:@"category"] forkey:_curateditemdictionary]; 

i did because couldn't store key category , value dictionary dictionaries not support duplicate keys.

i getting numberofsectionsintableview using below code

- (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     // return number of sections.     for(nsstring *key in [_sectionsdictionary allkeys]) {         [_cleanarray addobject:[_sectionsdictionary objectforkey:key]];     }     nscountedset *set = [[nscountedset alloc] initwitharray:_cleanarray];             (id item in set) {                    nsinteger count =  (unsigned long)[set countforobject:item];         [_rowforindexarray addobject:[nsnumber numberwithinteger:count]];     }             _cleansectionarray = [[nsset setwitharray:_cleanarray] allobjects];     return [_cleansectionarray count]; } 

how numberofrowsinsection above information ? how know items being iterated particular section ?

here code using create curateditemdictionary parse.com data

pfquery *query  = [pfquery querywithclassname:[nsstring stringwithstring:self.classname]];     [query findobjectsinbackgroundwithblock:^(nsarray *objects, nserror *error) {         if (!error) {             // find succeeded.              (pfobject *obj in objects) {               self.curateditemdictionary = [[nsmutabledictionary alloc]init];                [_curateditemdictionary setvalue:[obj objectforkey:@"itemname"] forkey:@"itemname"];             [_curateditemdictionary setvalue:[obj objectforkey:@"price"] forkey:@"price"];               [_sectionsdictionary setobject:[obj objectforkey:@"category"] forkey:_curateditemdictionary];                 [self.tableview reloaddata];         } else {             // log details of failure             nslog(@"error: %@ %@", error, [error userinfo]);         }     }]; 

based on code provided in comment original post similar that, alternative:

self.sectionsdictionary = [nsmutabledictionary new]; nsmutablearray *sectionsarray;  (pfobject *obj in objects) {     sectionsarray = [self.sectionsdictionary objectforkey: [obj objectforkey:@"category"]];     if (nil == sectionsarray) sectionsarray = [nsmutablearray new];     [sectionsarray addobject: obj]     [self.sectionsdictionary setobject: sectionsarray forkey: [obj objectforkey:@"category"]]; } 

then in numberofsectionsintableview can amount of sections accessing count method on nsmutabledictionary

- (nsinteger)numberofsectionsintableview:(uitableview *)tableview {      return [self.sectionsdictionary count]; } 

and if need number of rows in each particular section:

- (nsinteger) tableview:(uitableview*)tableview numberofrowsinsection:(nsinteger)section {     nsarray *keys = [self.sectionsdictionary allkeys];     id akey = [keys objectatindex:section];     nsmutablearray *arr = [self.sectionsdictionary objectforkey:akey];      return (arr) ? arr.count : 0; } 

but of course can loop through keys in sectionsdictionary when preparing datasource , put section index key, not need use allkeys trick.