What's the shortest way to negate a BOOL in Objective-C?

I remember in Java you could just go

bool yesNo = YES;
!yesNo;

and it would be NO automatica开发者_高级运维lly. I've tried this a few times in Objective-C but it doesn't seem to work. Is there a language specific way to do this in Objective-C?

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It works more or less the same way - you just have to remember to assign the result of the negation expression back to the variable, like so:

yesNo = !yesNo;