CODEWITHSUNDEEP
iosobjective-cnsmutabledictionary
Kyriakos Leivadas
Kyriakos Leivadas

Reputation: 125

Replace some contents of NSMutableDictionary with another NSMutableDictionary

i am having 2 NSMutableDictionaries that each has 5 NSArrays inside,

these 2 NSMutableDictionaries have excactly the same 5 keys and NSArrays but with different content,

i need to replace only 2 Arrays with the Arrays of the other NSMutableDictionary so 

dic1 = dic2; //isn't a solution...will replace all the contents of the one to the other...

i need something that can replace the object of a specific key with the other same key.

i tried 

[dic1 setObject:[dic2 objectForKey:@"key1"] forKey:@"key1"];
[dic1 setObject:[dic2 objectForKey:@"key2"] forKey:@"key2"];

and i get ERROR: attempt to insert nil value (key: key1)'

Upvotes: 0

Views: 50

Answers (1)

Tommy Devoy
Tommy Devoy

Reputation: 13549

The error just means [dic2 objectForKey:@"key1"] is returning a nil value. In other words, that key does not exist in the dictionary. Likewise, you can't set a nil value inside of an NSDictionary, so thats why the error is sent out.

Print out each of the dictionaries and ensure your keys/values are what you expect. You can use an NSLog or just pause the program with a breakpoint, and enter po dic1 in the console.

Upvotes: 1

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