CODEWITHSUNDEEP
objective-c
Bill
Bill

Reputation: 3672

How to Properly set an integer value in NSDictionary?

The following code snippet:

NSLog(@"userInfo: The timer is %d", timerCounter);

NSDictionary *dict = [NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:timerCounter] forKey:@"timerCounter"];

NSUInteger c = (NSUInteger)[dict objectForKey:@"timerCounter"];
NSLog(@"userInfo: Timer started on %d", c);

produces output along the lines of:

2009-10-22 00:36:55.927 TimerHacking[2457:20b] userInfo: The timer is 1
2009-10-22 00:36:55.928 TimerHacking[2457:20b] userInfo: Timer started on 5295968

(FWIW, timerCounter is a NSUInteger.)

I'm sure I'm missing something fairly obvious, just not sure what it is.

Upvotes: 14

Views: 22550

Answers (3)

Kez
Kez

Reputation: 71

Or like this with literals:

NSUInteger c = ((NSNumber *)dict[@"timerCounter"]).unsignedIntegerValue;

You must cast as NSNumber first as object pulled from dictionary will be id_nullable and so won't respond to the value converting methods.

Upvotes: 0

Chuck
Chuck

Reputation: 237070

Dictionaries always store objects. NSInteger and NSUInteger are not objects. Your dictionary is storing an NSNumber (remember that [NSNumber numberWithInteger:timerCounter]?), which is an object. So as epatel said, you need to ask the NSNumber for its unsignedIntegerValue if you want an NSUInteger.

Upvotes: 11

epatel
epatel

Reputation: 46041

You should use intValue from the received object (an NSNumber), and not use a cast:

NSUInteger c = [[dict objectForKey:@"timerCounter"] intValue];

Upvotes: 23

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