xcode - iOS Incompatible pointer types returning NSDictionary from NSMutableDictionary -

i'm having issue use nsmutabledictionaries returns values nsdictionary.

here warning message:

incompatible pointer types returning 'nsdictionary *' function result type 'nsmutabledictionary *'

here code:

- (nsmutabledictionary *)dictionarywithcontentsatpath:(nsstring *)path   {  if ([path rangeofstring:@"/sessionstore"].location == 0)  {  return [_inmemorycache objectforkey:[path stringbyreplacingcharactersinrange:nsmakerange(0, 13) withstring:@""]];  }  if ([path rangeofstring:@"/permanentstore"].location == 0)   {  return [nsdictionary dictionarywithcontentsoffile:[self.persistentstoragepath stringbyappendingpathcomponent:[path substringfromindex:15]]];  }  return nil;  } 

please me how resolve warning.

you need ensure you're returning right type. method states it's returning nsmutabledictionary, returns nsdictionary.

try instead:

- (nsmutabledictionary*)dictionarywithcontentsatpath:(nsstring*)path {      if ([path rangeofstring:@"/sessionstore"].location == 0) {         return [[_inmemorycache objectforkey:[path stringbyreplacingcharactersinrange:nsmakerange(0, 13) withstring:@""]] mutablecopy];     }      if ([path rangeofstring:@"/permanentstore"].location == 0) {         return [nsmutabledictionary dictionarywithcontentsoffile:[self.persistentstoragepath stringbyappendingpathcomponent:[path substringfromindex:15]]];     }      return nil; } 

note: added call mutablecopy turn literal nsdictionary mutable version, , in second case, used called dictionarywithcontentsoffile method on nsmutabledictionary subclass instead of nsdictionary parent class.