iphone - Using nested NSDictionary with Picker -

newbie here,

i have single component picker set plist, each item being array, multiple strings in each array app uses.

currently plist structure this:

nsdictionary  ->  nsarray  ->  nsstring                      |             |             items in picker     data each item 

but now, want:

nsdictionary  ->  nsdictionary  ->  nsarray  ->  nsstring                       |                |              |   different picker data sets      items in picker   data each item 

so there multiple sets of picker components show using segmented control etc...

i'm not sure if possible, , hoping save me making many different separate picker controllers.

what has me stumped getting ingested properly

this have now, builds crashes (debug info below):

nsbundle *bundle = [nsbundle mainbundle];  nsstring *plistpath = [bundle pathforresource:@"camerasdatabase" oftype:@"plist"];  nsdictionary *dictionary = [[nsdictionary alloc] initwithcontentsoffile:plistpath]; self.allcameras = dictionary; [dictionary release];  nsarray *cameratypes = [self.allcameras allkeys]; self.camtypes = cameratypes;  nsarray *items = [self.camtypes objectatindex:0]; self.cameras = items;  nsstring *selectedcamera = [self.cameras objectatindex:0]; nsarray *array = [camslist objectforkey:selectedcam]; self.cameradata = array; 

i've tried many different combinations of dictionaries, arrays, , strings i'm sure above code messed up.

it crashes at:

nsstring *selectedcamera = [self.cameras objectatindex:0]; 

with "-[nscfstring objectatindex:]: unrecognized selector sent instance 0x4e127f0"

it obvious, having nsstring objects (keys) in self.camtypes. not nsarray.

so these lines invalid

nsarray *items = [self.camtypes objectatindex:0]; self.cameras = items;  nsstring *selectedcamera = [self.cameras objectatindex:0]; //this line cause of exception. 

for fixing write code thing this

nsbundle *bundle = [nsbundle mainbundle];  nsstring *plistpath = [bundle pathforresource:@"camerasdatabase" oftype:@"plist"];  nsdictionary *dictionary = [[nsdictionary alloc] initwithcontentsoffile:plistpath]; self.allcameras = [dictionary valueforkey:@"key "];//key accesing inner dictionary [dictionary release];    nsarray *cameratypes = [self.allcameras allkeys]; self.camtypes = cameratypes;   nsarray *items = [self.allcameras valueforkey:[self.camtypes objectatindex:0]]; self.cameras = items;  nsstring *selectedcamera = [self.cameras objectatindex:0]; nsarray *array = [camslist objectforkey:selectedcam]; self.cameradata = array; 

so in above code self.allcameras dictionary having arrays corresponding different key (cameratypes in self.camtypes).