ios - Updating NSDictionary inside an NSArray -


i have nsarray of nsdictionaries. need updated nsarray of nsdictionaries value of 1 of dictionary key updated new value.

please see below nsarray structure. want update value key3 inside structure if key1 matches value (e.g. 2). fastest way of doing this. not want use traditional loop. 

[myarray valueforkeypath:@"@unionofobjects.key3"];  <__nscfarray 0xe70c10>( {     key1 = 1;     key2 = "new location";     key3 =     (         data1,         data2,         data3     ); }, {     key1 = 2;     key2 = "old location";     key3 =     (         data1,         data2,         data4     ); } )

we can solve using predicates:

nsarray *dictionaryarray; nsnumber *key =@2; nspredicate *predicate =[nspredicate predicatewithformat:@"key1=%@",key]; nsarray *result =[dictionaryarray filteredarrayusingpredicate:predicate];

result array has dictionaries having (key1 = 2)

dictionarys can't edited directly, must nsmutabledictionary edit. assuming nsmutabledictionary instances:

nsmutabledictionary *dic =result[0]; [dic setobject:someobject forkey:@"key3"];

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