Helium3 Helium3 -5 years ago 197
Objective-C Question

How to add to an NSDictionary

I was using a NSMutableArray and realised that using a dictionary is a lot simpler for what I am trying to achieve.

I want to save a key as a NSString and a value as an int in the dictionary. firstly , how is this done? Secondly, what is the difference between mutable and a normal dictionary?


Answer Source

A mutable dictionary can be changed, i.e. you can add and remove objects. An immutable is fixed once it is created.

create and add:

NSMutableDictionary *dict = [[NSMutableDictionary alloc]initWithCapacity:10];
[dict setObject:[NSNumber numberWithInt:42] forKey:@"A cool number"];

and retrieve:

int myNumber = [[dict objectForKey:@"A cool number"] intValue];
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