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fengb/gist:fc1cf780923890426c83

Last active August 29, 2015 14:20
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KVO context hack
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gistfile1.m
#define CLASS_KVO_CONTEXT ((__bridge void *)[self class])
[_quote addObserver:self forKeyPath:@"bid" options:0 context:CLASS_KVO_CONTEXT];
#define CLASS_KVO_CONTEXT(instance) ((__bridge void *)[instance class])
[_quote addObserver:self forKeyPath:@"bid" options:0 context:CLASS_KVO_CONTEXT(self)];
#define KVO_CONTEXT(instance) ((__bridge void *)[instance class])
[_quote addObserver:self forKeyPath:@"bid" options:0 context:KVO_CONTEXT([self class])];
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