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);

p开发者_JAVA技巧roduces 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.

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

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

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.

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.