CODEWITHSUNDEEP
objective-cnsdictionary
rspeeds
rspeeds

Reputation: 31

Objective-C valueforKey

I am using an NSDictionary to store a set values and I am trying to assign them to a double. However I am not sure what to do, valueforkey returns an id which is a pointer. I have tried using the '*' get the actual value but that does not work.

This is the code

tempBrain.operand = [variables valueForKey:[(NSString*)obj  stringByReplacingOccurencesOfString:VARIABLE_PREFIX  withString:@""]];

tempBrain.operand is a setter method for a double variable. Variables is my NSDictionary.

Upvotes: 3

Views: 3721

Answers (3)

rspeeds
rspeeds

Reputation: 31

I get it now, it returns an object so I should send the doubleValue message to it.

Upvotes: 0

5hrp
5hrp

Reputation: 2230

NSDictionary can contain only objects of NSObject subclasses.

Try do this:

NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:10];

// Add object
[dic setObject:[NSNumber numberWithDouble:3.0] forKey:@"Third"];

// Read object
double val = [[dic objectForKey:@"Third"] doubleValue];

Upvotes: 1

Nick Moore
Nick Moore

Reputation: 15857

Assuming the value stored is an NSNumber you can use doubleValue like this:

tempBrain.operand = [[variables objectForKey:[(NSString*)obj  stringByReplacingOccurencesOfString:VARIABLE_PREFIX  withString:@""]] doubleValue];

Note also I have changed valueForKey to objectForKey, which is the correct method to use to get an object from an NSDictionary.

Upvotes: 6

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