objective c - Caching with NSMutableDictionary -

i new caching thing, , want cache (just when app still open) arrays of data. can tell me how using nsmutabledictionnary ?

thanks.

nsmutabledictionary collection type allows store data via key/value pairs. key of pair search , value want retrieve. if have key named dob may expect value of "1-19-1989".

if want cache right @ beginning of start in applicationdidfinishlaunchingwithoptions: in appdelegate file. go this...

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {  //// whatever data need nsstring *key = @"dob"; nsstring *value = @"1-19-89";  // place dictionary nsdictionary *dictionary = @{key: value};  // , nsmutabledictionary  nsmutabledictionary *mutabledictionary = [nsmutabledictionary new]; [mutabledictionary setobject:value forkey:key];  return yes;   } 

and @abhinav said, can either store nsuserdefaults small data , advise coredata large amounts of data.