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Is there a way to change the value contained in an NSNumber after it is created without making it point to a different NSNumber?
NSNumber *num = [NSNumber numberWithInt:0]; num = [NSNumber numberWithInt: 1]; // now num points to a different object, which I don't want. I want it the same object still, but different value.
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All NSNumber instances are immutable, and there is no mutable subclass; if you need a different number, simply use another NSNumber instance.
NSNumber provides readonly properties that return the object's stored value converted to a particular Boolean, integer, unsigned integer, or floating point C scalar type.
The change dictionary passed on by observeValueForKeyPath:ofObject:change:context: may contain a null value that will not evaluate to 'nil'. Thus 'NSNumber *oldNumber = [change valueForKey:NSKeyValueChangeOldKey];' will pass the (oldNumber != nil) test but then something like 'oldNumber.
NSNumber is immutable. Actually, it's a subclass of NSValue, and all NSValues are immutable.
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No, you can't change the value of NSNumber.
See, for example, this post.
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