iphone - Using NSPredicate with nested arrays ios -

i have array this

nsmutablearray *level1; nsmutablearray *level2; nsmutablearray *level3;  self.questionsections=[[nsarray alloc] initwithobjects:@"level 1",@"level 2",@"level 3", nil];  level1=[[nsmutablearray alloc] init]; level2=[[nsmutablearray alloc] init]; level3=[[nsmutablearray alloc] init];  [level1 addobject:[[nsdictionary alloc] initwithobjectsandkeys:                    @"what opposite of up?",@"name",                    @"101q.png",@"questionpicture",                    nil]];  [level1 addobject:[[nsdictionary alloc] initwithobjectsandkeys:                    @"what opposite of front?",@"name",                    @"102q.png",@"questionpicture",                    nil]];   [level2 addobject:[[nsdictionary alloc] initwithobjectsandkeys:                    @"name common pet?",@"name",                    @"201q.png",@"questionpicture",                    nil]];   [level2 addobject:[[nsdictionary alloc] initwithobjectsandkeys:                    @"name common bird?",@"name",                    @"202q.png",@"questionpicture",                    nil]];   [level3 addobject:[[nsdictionary alloc] initwithobjectsandkeys:                    @"list 3 rooms in house?",@"name",                    @"301q.png",@"questionpicture",                    nil]];  self.questiondata=[[nsarray alloc] initwithobjects:level1,level2,level3, nil]; 

and want search it. trying getting nowhere

nspredicate *resultpredicate=[nspredicate predicatewithformat:@"name contains 'the'"];  nslog(@"%@",resultpredicate); nslog(@"%@",self.questiondata);  self.searchresults=[self.questiondata  filteredarrayusingpredicate:resultpredicate];  nslog(@"%@",self.searchresults); 

resultpredicate looks fine "name contains 'the'"

self.questiondata looks fine

but self.searchresults ( )

any ideas great. thanks.

here problem array.

(         (                 {             name = "what opposite of up?";             questionpicture = "101q.png";         },                 {             name = "what opposite of front?";             questionpicture = "102q.png";         }     ),         (                 {             name = "name common pet?";             questionpicture = "201q.png";         },                 {             name = "name common bird?";             questionpicture = "202q.png";         }     ),         (                 {             name = "list 3 rooms in house?";             questionpicture = "301q.png";         }     ) ) 

for working above predicate array must this,

(         {         name = "what opposite of up?";         questionpicture = "101q.png";     },         {         name = "what opposite of front?";         questionpicture = "102q.png";     },         {         name = "name common pet?";         questionpicture = "201q.png";     },         {         name = "name common bird?";         questionpicture = "202q.png";     },         {         name = "list 3 rooms in house?";         questionpicture = "301q.png";     } ) 

edit:- try this,

 nsarray *questiondata=[[nsarray alloc] initwithobjects:level1,level2,level3, nil];  nspredicate *resultpredicate=[nspredicate predicatewithformat:@"name contains 'the'"];   nsmutablearray *resultarray= [[nsmutablearray alloc]init]; for(int i=0;i<[questiondata count];i++){     nsarray* searchresults=[[questiondata objectatindex:i]  filteredarrayusingpredicate:resultpredicate];     if([searchresults count]>0)         [resultarray addobject:searchresults]; } nslog(@"%@",resultarray); o/p:-  (         (                 {             name = "what opposite of up?";             questionpicture = "101q.png";         },                 {             name = "what opposite of front?";             questionpicture = "102q.png";         }     ) )